Method and device for measuring ionosphere geomagnetic field intensity, observation equipment and computer readable storage medium
By using the observation data of incoherent scattering radar, the target geomagnetic measurement height of the peak height of the ionosphere and the electron magnetic rotation frequency are calculated, the problem that traditional measurement methods cannot accurately measure the geomagnetic field intensity of the ionosphere is achieved, and high-precision in-situ measurement is achieved.
Patent Information
- Application Number
- CN202510368279.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-06-20
AI Technical Summary
Traditional geomagnetic field measurement methods cannot accurately measure the geomagnetic field strength near the peak height of the ionosphere. Due to the error of the geomagnetic field model, in-situ measurement cannot be achieved.
By obtaining the observation data of the incoherent scattering radar in the observation mode, including the electronic temperature disturbance profile timing and the heat pump pump wave frequency timing, the height that meets the peak height of the ionosphere is determined as the target geomagnetic measurement height, and the electron magnetic rotation frequency is calculated based on the data at this height, and the geomagnetic field intensity of the ionosphere is finally determined.
The error generated by the extrapolation of the foundation measurement by the geomagnetic field model is overcome, and the in-situ measurement of the geomagnetic field strength near the peak height of the ionosphere is achieved, improving the accuracy of the measurement.
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Figure CN120178359A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of radar detection, and for example, relates to a method, device, equipment, and computer-readable storage medium for measuring the geomagnetic field intensity of the ionosphere. Background Art
[0002] At present, it is necessary to measure the geomagnetic field in many aspects. By observing the changes in the geomagnetic field, the internal structure and evolutionary history of the earth can be revealed, the impact of solar activities on the earth's space environment can be studied, and it can provide a reference for earthquake monitoring and prediction research; it is used for mineral resource exploration, environmental monitoring, determining the age and nature of archaeological sites, achieving high-precision autonomous navigation, improving the navigation ability of weapons and equipment, and providing important basic data for national economic construction.
[0003] There are various ways to measure the geomagnetic field. Traditional ground-based and airborne geomagnetic field measurement methods include fluxgate magnetometers, proton precession magnetometers, optically pumped magnetometers, etc., and the geomagnetic field intensity at different heights is obtained by extrapolating through the geomagnetic field model. However, although satellite payloads such as fluxgate magnetometers, proton precession magnetometers, and optically pumped magnetometers can measure the geomagnetic field intensity at the satellite orbit altitude, the orbit altitude of low-earth orbit satellites is between 450 and 500 km and cannot reach the peak height of the ionosphere (generally 200 to 400 km). At the same time, the above geomagnetic field measurement methods are restricted by the errors of the geomagnetic field model and cannot accurately measure the geomagnetic field intensity at the ionospheric height. Therefore, the traditional geomagnetic field measurement methods cannot achieve in-situ measurement of the geomagnetic field intensity near the peak height of the ionosphere. Summary of the Invention
[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important elements or delineate the scope of protection of these embodiments, but rather serves as a preamble to the subsequent detailed description.
[0005] The embodiments of the present disclosure provide a method, device, equipment, and computer-readable storage medium for measuring the geomagnetic field intensity of the ionosphere to overcome the errors caused by the extrapolation of the geomagnetic field model for ground-based measurements and achieve in-situ measurement of the geomagnetic field intensity near the peak height of the ionosphere.
[0006] In some embodiments, the method includes: obtaining observation data of an incoherent scatter radar in an observation mode; wherein the observation data includes the time series of the electron temperature perturbation profile and the time series of the heating pump wave frequency; based on the time series of the electron temperature perturbation profile, determining the height that meets the ionospheric peak height condition as the target geomagnetic measurement height; based on the time series of the electron temperature perturbation and the time series of the heating pump wave frequency at the target geomagnetic measurement height, determining the electron cyclotron frequency at the target geomagnetic measurement height; and determining the geomagnetic field strength of the ionosphere at the target geomagnetic measurement height according to the electron cyclotron frequency at the target geomagnetic measurement height.
[0007] In some embodiments, determining the height that meets the ionospheric peak height condition as the target geomagnetic measurement height based on the time series of the electron temperature perturbation profile includes: obtaining the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies based on the time series of the electron temperature perturbation profile; determining multiple geomagnetic measurement heights based on the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies; determining the step perturbation intensity of the electron temperature with respect to the pump wave frequency at each geomagnetic measurement height; and selecting the geomagnetic measurement height with the maximum step perturbation intensity of the electron temperature as the target geomagnetic measurement height.
[0008] In some embodiments, determining the electron cyclotron frequency at the target geomagnetic measurement height based on the time series of the electron temperature perturbation and the time series of the heating pump wave frequency at the target geomagnetic measurement height includes: determining the pump wave broadening frequency band; wherein the pump wave broadening frequency band is composed of the lower limit value of the pump wave frequency and the upper limit value of the pump wave frequency; determining the first electron temperature step perturbation moment close to the upper limit value of the pump wave frequency within each pump wave period as the target step perturbation moment based on the time series of the electron temperature perturbation at the target geomagnetic measurement height; determining the pump wave frequency different from the upper and lower limit values of the pump wave frequency and corresponding to the target step perturbation moment as the target pump wave frequency based on the time series of the heating pump wave frequency; and determining the electron cyclotron frequency at the target geomagnetic measurement height according to the target pump wave frequency.
[0009] In some embodiments, determining the electron cyclotron frequency at the target geomagnetic measurement height according to the target pump wave frequency includes: obtaining the multiple frequency number of the pump wave frequency band of the incoherent scatter radar in the observation mode; and determining the electron cyclotron frequency at the target geomagnetic measurement height according to the ratio of the target pump wave frequency to the multiple frequency number of the pump wave frequency band.
[0010] In some embodiments, determining the geomagnetic field strength of the ionosphere at the target geomagnetic measurement height according to the electron cyclotron frequency at the target geomagnetic measurement height includes: according to determining the geomagnetic field strength of the ionosphere at the target geomagnetic measurement height; wherein f ce 、m e 、e respectively represent the electron cyclotron frequency, the electron mass, and the electron charge amount.
[0011] In some embodiments, obtaining the observation data of the incoherent scatter radar in the observation mode includes: determining an estimated value of the ionospheric peak height; constructing a pump wave broadening frequency band based on the estimated value of the ionospheric peak height; configuring a heating pump according to the pump wave broadening frequency band and pump wave parameters; and configuring the incoherent scatter radar according to the set detection parameters in the observation mode for inverting the electron temperature.
[0012] In some embodiments, constructing a pump wave broadening frequency band based on the estimated value of the ionospheric peak height includes: obtaining an estimated value of the electron cyclotron frequency corresponding to the estimated value of the ionospheric peak height and an estimated value of the peak frequency corresponding to the estimated value of the ionospheric peak height; obtaining the ratio of the estimated value of the peak frequency corresponding to the estimated value of the ionospheric peak height to the estimated value of the electron cyclotron frequency corresponding to the estimated value of the ionospheric peak height and rounding it to determine the rounded result as the multiple number of the pump wave frequency band; and performing frequency broadening based on the pump wave center frequency to determine the pump wave broadening frequency band.
[0013] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the method for measuring the ionospheric geomagnetic field strength as described above when running the program instructions.
[0014] In some embodiments, the observation device includes: an observation device body; and the device for measuring the ionospheric geomagnetic field strength as described above, which is installed on the observation device body.
[0015] In some embodiments, a computer-readable storage medium stores program instructions, and when the program instructions are running, they are used to cause a computer to execute the method for measuring the ionospheric geomagnetic field strength as described above.
[0016] The method, device, equipment, and computer-readable storage medium for measuring the ionospheric geomagnetic field strength provided by the embodiments of the present disclosure can achieve the following technical effects:
[0017] In the embodiments of the present disclosure, after the observation device obtains the observation data of the incoherent scatter radar in the observation mode, it first determines the height that meets the ionospheric peak height condition based on the electron temperature perturbation profile time series as the target geomagnetic measurement height. Then, the observation device determines the electron cyclotron frequency at the target geomagnetic measurement height based on the electron temperature perturbation time series and the heating pump pump wave frequency time series at the target geomagnetic measurement height. Finally, the observation device calculates the geomagnetic field strength of the ionosphere at the target geomagnetic measurement height according to the electron cyclotron frequency at the target geomagnetic measurement height. The embodiments of the present disclosure can determine the target geomagnetic measurement height based on the electron temperature perturbation profile time series included in the observation data, and determine the geomagnetic field strength at the above target geomagnetic measurement height based on the electron temperature perturbation profile time series and the heating pump pump wave frequency time series. In this way, the error caused by the extrapolation of the geomagnetic field model for ground-based measurement can be overcome, and the in-situ measurement of the geomagnetic field strength near the ionospheric peak height can be realized.
[0018] The above general description and the following description are only exemplary and explanatory, and are not intended to limit this application. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] One or more embodiments are illustrated by way of example with reference to the corresponding drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and:
[0020] Figure 1 is a schematic diagram of a method for measuring the geomagnetic field strength of the ionosphere provided by an embodiment of the present disclosure;
[0021] Figure 2 is a schematic diagram of another method for measuring the geomagnetic field strength of the ionosphere provided by an embodiment of the present disclosure;
[0022] Figure 3 is a schematic diagram of another method for measuring the geomagnetic field strength of the ionosphere provided by an embodiment of the present disclosure;
[0023] Figure 4 is a schematic diagram of another method for measuring the geomagnetic field strength of the ionosphere provided by an embodiment of the present disclosure;
[0024] Figure 5 is a schematic diagram of another method for measuring the geomagnetic field strength of the ionosphere provided by an embodiment of the present disclosure;
[0025] Figure 6-1 is a schematic diagram of the time series of the electron temperature perturbation profile provided by an embodiment of the present disclosure;
[0026] Figure 6-2 is a schematic diagram of the time series of the pump wave frequency of the heating pump provided by an embodiment of the present disclosure;
[0027] Figure 6-3 is a schematic diagram of the time series of the electron temperature perturbation and the corresponding pump wave frequency of the step perturbation at the target geomagnetic measurement altitude of 199.6 km provided by an embodiment of the present disclosure;
[0028] Figure 6-4 is a schematic diagram of the geomagnetic field strength of the ionosphere at the target geomagnetic measurement altitude of 199.6 km provided by an embodiment of the present disclosure;
[0029] Figure 6-5 is the ionogram of the ionosphere provided by an embodiment of the present disclosure;
[0030] Figure 7 is a schematic diagram of a device for measuring the geomagnetic field strength of the ionosphere provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0031] In order to more comprehensively understand the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other instances, well-known structures and devices may be shown in a simplified manner to simplify the drawings.
[0032] In the description of the embodiments of the present disclosure and the claims and the above-mentioned drawings, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.
[0033] Unless otherwise specified, the term "plurality" means two or more.
[0034] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.
[0035] The term "and / or" is a description of the association relationship of an object and indicates that three relationships may exist. For example, A and / or B means: A or B, or, A and B these three relationships.
[0036] The term "corresponding" may refer to an association relationship or a binding relationship. That A corresponds to B means that there is an association relationship or a binding relationship between A and B.
[0037] In the embodiments of the present disclosure, the system for measuring the ionospheric geomagnetic field intensity includes observation equipment. The observation equipment includes an incoherent scatter radar and an ionospheric heating device, and the ionospheric heating device is configured with a heating pump. The ionospheric heating device conducts an ionospheric heating experiment based on the ionospheric heating effect.
[0038] Among them, ionospheric heating mainly uses a ground-based high-power heating array to emit radio waves in the high-frequency band (3 Hz to 30 Hz). These radio waves interact with the ionospheric plasma, causing electrons to be accelerated under the action of the incident wave field. Due to the energy transfer during the collision process of the ionospheric plasma, the energy of the high-frequency radio wave is absorbed, thereby generating an ionospheric heating effect. Ionospheric heating will cause the electron temperature to increase or be disturbed. Therefore, the embodiments of the present disclosure can cooperate with an incoherent scatter radar and an ionospheric heating pump to conduct an ionospheric heating experiment to observe the electron temperature disturbance at different geomagnetic sounding altitudes, and measure the geomagnetic sounding altitude and calculate the geomagnetic field strength based on the electron temperature disturbance.
[0039] Based on the above system for measuring the ionospheric geomagnetic field strength, combined with Figure 1 As shown, the embodiments of the present disclosure provide a method for measuring the ionospheric geomagnetic field strength, including:
[0040] S01, an observation device obtains the observation data of the incoherent scatter radar in the observation mode. Among them, the observation data includes the time series of the electron temperature disturbance profile and the time series of the heating pump pumping wave frequency. The time series of the electron temperature disturbance profile represents the variation of the electron temperature along the geomagnetic field direction with time and geomagnetic space in the plasma. The time series of the heating pump pumping wave frequency represents the variation of the heating pump pumping wave with time.
[0041] S02, the observation device determines the height that meets the ionospheric peak height condition as the target geomagnetic sounding height based on the time series of the electron temperature disturbance profile.
[0042] S03, the observation device determines the electron gyrofrequency at the target geomagnetic sounding height based on the time series of the electron temperature disturbance and the time series of the heating pump pumping wave frequency at the target geomagnetic sounding height.
[0043] S04, the observation device determines the geomagnetic field strength of the ionosphere at the target geomagnetic sounding height according to the electron gyrofrequency at the target geomagnetic sounding height.
[0044] Using the method for measuring the ionospheric geomagnetic field strength provided by the embodiments of the present disclosure, in the embodiments of the present disclosure, after the observation device obtains the observation data of the incoherent scatter radar in the observation mode, first, based on the time series of the electron temperature perturbation profile, the height that meets the ionospheric peak height condition is determined as the target geomagnetic measurement height. Then, the observation device determines the electron cyclotron frequency at the target geomagnetic measurement height based on the time series of the electron temperature perturbation and the time series of the heating pump pump wave frequency at the target geomagnetic measurement height. Finally, the observation device calculates the geomagnetic field strength of the ionosphere at the target geomagnetic measurement height according to the electron cyclotron frequency at the target geomagnetic measurement height. The embodiments of the present disclosure can determine the target geomagnetic measurement height based on the time series of the electron temperature perturbation profile included in the observation data, and determine the geomagnetic field strength at the above target geomagnetic measurement height based on the time series of the electron temperature perturbation profile and the time series of the heating pump pump wave frequency. In this way, the error caused by the extrapolation of the geomagnetic field model for ground-based measurement can be overcome, and the in-situ measurement of the geomagnetic field strength near the ionospheric peak height can be realized.
[0045] In addition, traditional ground-based and airborne geomagnetic field measurement methods also include remote sensing measurement, which mainly uses sodium resonance fluorescence lidar, radar resonance enhanced multiphoton ionization technology, and microwave radiometer, etc. However, the sodium layer exists at about 90 km in height. The radar resonance enhanced multiphoton ionization technology obtains the geomagnetic field strength by detecting the behavior changes of some atoms or molecules (such as Xe129) in the magnetic field. However, Xe129 is extremely sparse at ionospheric heights, atomic oxygen has a relatively high proportion near the ionospheric height, especially near the peak height, while molecular oxygen has a relatively low proportion. Since the microwave radiometer uses the Zeeman effect of molecular oxygen for geomagnetic field measurement, it is difficult to observe the geomagnetic field strength near the ionospheric peak height through the above remote sensing measurement methods.
[0046] The measurement method provided by the embodiments of the present disclosure has no special requirements for the proportion of atoms or molecules in the ionospheric height in the geomagnetic field. Even if the proportion of atomic oxygen or molecular oxygen near the ionospheric peak height is relatively low, the embodiments of the present disclosure can still realize the remote measurement of the geomagnetic field height near the ionospheric peak height. Therefore, compared with the above remote sensing measurement methods, the measurement method provided by the embodiments of the present disclosure has stronger versatility.
[0047] Figure 6-1 Represents the time series of the electron temperature perturbation profile. Figure 6-2 Represents the schematic diagram of the time series of the heating pump pump wave frequency. Combined with Figure 6-1 and Figure 6-2 As shown, the observation period of the incoherent scatter radar is from 12:30 UT to
[0048] 14:30 UT (Universal Time). During the first pump wave period, the pump wave frequency decreases in order. Starting from 12:33 UT until approximately 12:39 UT, the electron temperature shows significant perturbations within the first pump wave period, reaching around 2700 K (Kelvin), and the height range of the electron temperature perturbations is only restricted near the 200 km height. Starting from approximately 12:39 UT, the electron temperature shows a downward trend and the electron temperature is almost the same as the background temperature, that is, there are no obvious perturbations in the electron temperature. However, starting from approximately 12:42 UT, the electron temperature begins to rise and increases with time sequence until 12:48 UT.
[0049] It can be seen from this that within the first pump wave period, the electron temperature at the reflection height experiences a process of enhancement - weakening - enhancement. Within the first pump wave period, assuming that the ionospheric background remains unchanged, the only parameter that changes throughout the process is the pump wave frequency. It can be seen that the changes presented by the electron temperature are caused by the changes in the pump wave frequency.
[0050] Within the second pump wave period (13:00 UT - 13:30 UT), the electron temperature at the 200 km height also experiences a process of enhancement - weakening - enhancement. Different from the first pump wave period, the pump wave frequency increases in order within this pump wave period. Based on Figure 6-1 It can be clearly seen that starting from 13:00 UT, the electron temperature at the 200 km height increases. At approximately 13:08 UT, the electron temperature decreases and is almost the same as the background temperature. At approximately 13:04 UT, the electron temperature rises again, but does not reach the perturbation intensity during the time period from 13:00 UT to 13:08 UT. It should be noted that similar situations also exist in the third pump wave period and the fourth pump wave period, and the embodiments of the present disclosure will not elaborate on this.
[0051] Optionally, as shown in Figure 2 , the observation device determines the height that meets the ionospheric peak height condition as the target geomagnetic measurement height based on the time sequence of the electron temperature perturbation profile, including:
[0052] S11, the observation device obtains the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies based on the time sequence of the electron temperature perturbation profile.
[0053] In this step, the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies indicates whether there are obvious perturbations in the electron temperature at different geomagnetic detection heights with the change of the pump wave frequency.
[0054] S12, the observation device determines multiple geomagnetic measurement heights based on the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies.
[0055] In this step, the observation device determines multiple geomagnetic measurement heights based on the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies, including: the observation device determines multiple geomagnetic measurement heights based on the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies. When it is determined that there are obvious perturbations in the electron temperature with the change of the pump wave frequency at each geomagnetic detection height, the observation device determines the geomagnetic detection height corresponding to the obvious perturbation of the electron pump wave with the pump wave frequency as the geomagnetic detection height.
[0056] S13. The observation device determines the step perturbation intensity of the electron temperature with the pump wave frequency at each geomagnetic measurement height.
[0057] S14. The observation device selects the geomagnetic measurement height with the maximum step perturbation intensity of the electron temperature as the target geomagnetic measurement height.
[0058] In this way, within each heating cycle of the heating pump, the pump wave frequency increases or decreases in order. Assuming that the ionospheric background remains unchanged, the only parameter that changes during the entire heating process is the pump wave frequency of the heating pump. Therefore, the enhancement or weakening process presented by the electron temperature is caused by the increase or decrease in the pump wave frequency of the heating pump. For the electron temperature, at the peak height, the step perturbation intensity of the electron temperature is the strongest. Based on this, the observation device first obtains the perturbation trend of the electron temperature along the geomagnetic field direction at different pump wave frequencies based on the electron temperature perturbation profile time series and determines multiple geomagnetic measurement heights of suspected peak heights based on this perturbation trend. Then, the observation device determines the step perturbation intensity of the electron temperature with the pump wave frequency at each geomagnetic measurement height and selects the geomagnetic measurement height with the maximum step perturbation intensity of the electron temperature as the target geomagnetic measurement height, ensuring the accuracy and reliability of the electron temperature peak height measurement and helping to improve the accuracy of the geomagnetic field measurement near the peak height.
[0059] Optionally, as shown in Figure 3 the observation device determines the electron gyrofrequency at the target geomagnetic measurement height based on the electron temperature perturbation time series and the heating pump wave frequency time series at the target geomagnetic measurement height, including:
[0060] S21. The observation device determines the pump wave broadening frequency band. Among them, the pump wave broadening frequency band is composed of the lower limit value of the pump wave frequency and the upper limit value of the pump wave frequency.
[0061] S22. The observation device determines the first electron temperature step perturbation moment near the upper limit value of the pump wave frequency within each pump wave period as the target step perturbation moment based on the electron temperature perturbation time series at the target geomagnetic measurement height. Among them, the electron temperature perturbation time series at the target geomagnetic measurement height represents the change of the electron temperature along the geomagnetic field direction and at the target geomagnetic measurement height with time in the plasma.
[0062] S23. The observation device determines, based on the timing sequence of the heating pump wave frequency, that the pump wave frequency different from the upper and lower limit values of the pump wave frequency and corresponding to the target step disturbance moment is the target pump wave frequency.
[0063] S24. The observation device determines the electron gyro-frequency at the target geomagnetic measurement altitude according to the target pump wave frequency.
[0064] In this way, after the observation device determines the target geomagnetic measurement altitude, it first determines the pump wave frequency corresponding to the first electron temperature step moment close to the upper limit value of the pump wave frequency in each pump wave cycle, and then calculates the electron gyro-frequency at the target geomagnetic measurement altitude according to this pump wave frequency. In addition, the electron temperatures at the upper and lower limit values of the pump wave frequency need to be excluded. Based on this, after the embodiment of the present disclosure determines, based on the timing sequence of the heating pump wave frequency, that the first electron temperature step disturbance moment close to the upper limit value of the pump wave frequency in each pump wave cycle is the target step disturbance moment, it determines that the pump wave frequency different from the upper and lower limit values of the pump wave frequency and corresponding to the target step disturbance moment is the target pump wave frequency, and determines the electron gyro-frequency at the target geomagnetic measurement altitude based on the target pump wave frequency.
[0065] Optionally, the observation device determines the electron gyro-frequency at the target geomagnetic measurement altitude according to the target pump wave frequency, including:
[0066] The observation device obtains the multiple frequency number of the pump wave frequency band of the incoherent scatter radar in the observation mode.
[0067] The observation device determines the electron gyro-frequency at the target geomagnetic measurement altitude according to the ratio of the target pump wave frequency to the multiple frequency number of the pump wave frequency band.
[0068] In this way, after the observation device obtains the multiple frequency number of the pump wave frequency band of the incoherent scatter radar in the observation mode, it calculates the electron gyro-frequency at the target geomagnetic measurement altitude by taking the ratio of the target pump wave frequency to the multiple frequency number of the pump wave frequency band, ensuring the accuracy of the calculation of the electron gyro-frequency near the ionospheric peak altitude.
[0069] In a specific example, the observation device determines the electron gyro-frequency at the target geomagnetic measurement altitude according to the ratio of the target pump wave frequency to the multiple frequency number of the pump wave frequency band, including:
[0070] The observation device determines according to the electron gyro-frequency f at the target geomagnetic measurement altitude ce . Where f0 and n respectively represent the target pump wave frequency and the multiple frequency number of the pump wave frequency band.
[0071] In a practical application, in combination with Figure 6-2As shown, at the moment when the heating pump pump wave is turned on or off, the pump wave frequencies are the lower limit value of the pump wave frequency, 6.7 MHz, and the upper limit value of the pump wave frequency, 7 MHz, respectively. There is a step disturbance in the electron temperature near the ionospheric height of 200 km. However, when determining the electron cyclotron frequency at the target geomagnetic measurement height, the upper and lower limit values of the pump wave frequency must be excluded. Figure 6-4 Schematic diagram showing the geomagnetic field strength of the ionosphere at the target geomagnetic measurement height of 199.6 km.
[0072] Figure 6-3 Schematic diagram showing the time sequence of electron temperature disturbance and the pump wave frequency corresponding to the step disturbance at the target geomagnetic measurement height H of 199.6 km. Combining Figure 6-3 As shown, within the first pump wave period (12:30 UT - 12:48 UT), the pump wave frequency descends from 7 MHz to 6.7 MHz. The occurrence time of the first electron temperature step disturbance near the upper limit value of the pump wave frequency (7 MHz) is the target step disturbance time, 12:36:50 UT. The pump wave frequency at this moment is 6.8542 MHz.
[0073] Within the second pump wave period (13:00 UT - 13:18 UT), the pump wave frequency ascends from 6.7 MHz to 7 MHz. The occurrence time of the first electron temperature step disturbance near the upper limit value of the pump wave frequency (7 MHz) is the target step disturbance time, 13:09:30 UT. The pump wave frequency corresponding to this target step disturbance time, 6.8654 MHz, is the target pump wave frequency.
[0074] It should be noted that the third pump wave period and the fourth pump wave period are the same as the first pump wave period and the second pump wave period respectively. The occurrence times of the first electron temperature step disturbances near the upper limit value of the pump wave frequency (7 MHz) are the target step disturbance times, 13:37:00 UT and 14:10:00 UT respectively. The pump wave frequencies corresponding to these target step disturbance times, 6.9187 MHz and 6.8879 MHz, are the target pump wave frequencies.
[0075] Combining Figure 6-4 As shown, the pump wave frequencies at the four target step disturbance times, 12:36:50 UT, 13:09:30 UT, 13:37:00 UT, and 14:10:00 UT, at the target geomagnetic measurement height H = 199.6 km can be determined to be 6.8542 MHz, 6.8654 MHz, 6.9187 MHz, and 6.8879 MHz respectively. Combining Figure 6-4 As shown, using and n = 5, the electron cyclotron frequencies at the target geomagnetic measurement height of 199.6 km at the above target step disturbance times can be obtained as 1.37083 MHz, 1.37308 MHz, 1.38374 MHz, and 1.37758 MHz respectively.
[0076] Optionally, the observation device determines the geomagnetic field strength of the ionosphere at the target geomagnetic measurement altitude according to the electron gyro-frequency at the target geomagnetic measurement altitude, including:
[0077] The observation device determines the geomagnetic field strength of the ionosphere at the target geomagnetic measurement altitude. Where f ce , m e , and e respectively represent the electron gyro-frequency, the electron mass, and the electron charge amount.
[0078] In this way, the accuracy of the geomagnetic field strength calculation can be improved.
[0079] Optionally, as shown in Figure 4 , the observation device acquires the observation data of the incoherent scatter radar in the observation mode, including:
[0080] S31. The observation device determines the estimated value of the ionospheric peak altitude.
[0081] S32. The observation device constructs a pump wave broadening frequency band based on the estimated value of the ionospheric peak altitude.
[0082] S33. The observation device configures the heating pump according to the pump wave broadening frequency band and the pump wave parameters. The pump wave parameters include some or all of the pump wave duty cycle, beam pointing, frequency step time interval and step size, effective radiation power of the pump wave, and pump wave polarization mode. In a specific example, the pump wave duty cycle is 18 minutes on and 12 minutes off, the beam pointing is in the direction of the geomagnetic field (southward 12 ○ ), the frequency step time interval is 10 seconds, the step size is 2.08 kHz, the effective radiation power of the pump wave is about 70 MW, and the pump wave polarization mode is the O wave mode.
[0083] S34. The observation device configures the incoherent scatter radar according to the set detection parameters to invert the observation mode of the electron temperature. The set detection parameters include some or all of the observation mode, spatial detection range, spatial resolution, time resolution, detection direction, radar wave frequency, effective radar transmission power, radar reception sampling rate, time resolution, and range resolution. In a specific example, the incoherent scatter radar is a UHF (Ultra High Frequency) incoherent scatter radar. The observation mode is the beata mode, the spatial detection range is 76 km to 670 km, the spatial resolution is 3 km, the time resolution is 5 seconds, the detection direction is the direction of the geomagnetic field, the radar wave frequency is 933 MHz, the effective radar transmission power is 1.4 MW, the radar reception sampling rate is 10 μs, the time resolution is 5 seconds, and the range resolution is 1.5 m to 3 m.
[0084] In this way, the accuracy and reliability of the data obtained by the incoherent scatter radar are ensured. At the same time, conditions are provided for the ionospheric heating experiment of the ionospheric heating device.
[0085] Optionally, in combination with Figure 5 As shown, based on the estimated ionospheric peak height, the observation device constructs a pump wave broadening frequency band, including:
[0086] S41, the observation device obtains the estimated electron gyrofrequency corresponding to the estimated ionospheric peak height and the estimated peak frequency corresponding to the estimated ionospheric peak height.
[0087] S42, the observation device obtains the ratio of the estimated peak frequency corresponding to the estimated ionospheric peak height to the estimated electron gyrofrequency corresponding to the estimated ionospheric peak height and rounds it to determine the rounded result as the multiple number of the pump wave frequency band.
[0088] S43, the observation device determines the pump wave center frequency according to the product of the estimated electron gyrofrequency and the multiple number of the pump wave frequency band.
[0089] S44, the observation device performs frequency broadening based on the pump wave center frequency to determine the pump wave broadening frequency band.
[0090] In another practical application, considering the local ionospheric conditions and the operating status of the incoherent scatter radar and the ionospheric heating device of the European Incoherent Scatter Scientific Association (EISCAT), a chirped ionospheric heating experiment is implemented. During the experiment, the observation device is located near in northern Norway, with the latitude and longitude of 69.59N, 19.23E. The observation device includes an incoherent scatter radar and an ionospheric heating device, and the ionospheric heating device is configured with a heating pump.
[0091] By linearly extrapolating the geomagnetic field measurement at the Tromso ground base, the geomagnetic field intensity at an altitude of 210 km can be obtained to be approximately 4.9×10 4 nT, then the estimated electron gyrofrequency is 1.36 MHz. The ionogram (such as Figure 6-5 shown) of the local ionosonde at Tromso shows that the ionospheric peak height is approximately 270 km and the peak frequency is approximately 10 MHz.
[0092] Taking the estimated electron gyrofrequency as the pump wave center frequency for frequency broadening, the obtained broadening frequency band is 1.34 MHz - 1.4 MHz, and the ionospheric height corresponding to the broadening frequency band is 245 km - 140 km.
[0093] Taking as the center frequency (i.e., the multiple number n of the pump wave frequency band is 5), the above broadening frequency band is broadened to obtain the pump wave broadening frequency band of 6.7 MHz - 7 MHz.
[0094] From the perspective of the pump wave frequency of the heating pump, the reflection height of the ionospheric plasma corresponding to 6.7 MHz to 7 MHz is 200 km to 220 km. That is, within the height range of 200 km to 220 km, the ionospheric reflection frequency is within the pump wave frequency band of the heating pump, which is 6.7 MHz to 7 MHz. Therefore, a pump wave with a frequency range of 6.7 MHz to 7 MHz can be used, and the height range where the pump wave couples with the plasma is 200 km to 220 km.
[0095] Combined with Figure 7 As shown, the embodiment of the present disclosure provides a device 100 for measuring the ionospheric geomagnetic field strength, including a processor 700 and a memory 701. Optionally, the device 100 may further include a communication interface 702 and a bus 703. Among them, the processor 700, the communication interface 702, and the memory 701 can complete mutual communication through the bus 703. The communication interface 702 can be used for information transmission. The processor 700 can call the logical instructions in the memory 701 to execute the method for measuring the ionospheric geomagnetic field strength in the above embodiment.
[0096] In addition, when the logical instructions in the above-mentioned memory 701 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.
[0097] The memory 701, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 700 executes functional applications and data processing by running the program instructions / modules stored in the memory 701, that is, implements the method for measuring the ionospheric geomagnetic field strength in the above embodiment.
[0098] The memory 701 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 701 may include a high-speed random access memory and may also include a non-volatile memory.
[0099] An embodiment of the present disclosure provides an observation device, including: a product body, and the above-mentioned device 100 for measuring the ionospheric geomagnetic field intensity. The device 100 for measuring the ionospheric geomagnetic field intensity is installed on the observation device body. The installation relationship described here is not limited to being placed inside the observation device body, but also includes installation connections with other components of the observation device, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the device 100 for measuring the ionospheric geomagnetic field intensity can be adapted to a feasible observation device main body, thereby implementing other feasible embodiments.
[0100] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above-mentioned method for measuring the ionospheric geomagnetic field intensity.
[0101] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, such as: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, etc., which are various media that can store program codes.
[0102] The above description and the accompanying drawings sufficiently illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and are not used to limit the claims. As used in the description of embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups thereof. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. In this document, each embodiment may focus on the differences from other embodiments, and the same or similar parts between various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, the relevant parts may refer to the description of the method part.
Claims
1. A method for measuring the ionospheric magnetic field strength, characterized in that: include: Obtaining observation data of the incoherent scattering radar in the observation mode; wherein the observation data includes the time series of the electron temperature disturbance profile and the time series of the pump wave frequency of the heating pump; Based on the electron temperature disturbance profile time series, the altitude that meets the ionospheric peak altitude condition is determined as the target geomagnetic measurement altitude; Determine the electron magnetic rotation frequency at the target geomagnetic measurement altitude based on the electron temperature disturbance time sequence and the heating pump pump wave frequency time sequence at the target geomagnetic measurement altitude; The geomagnetic field strength of the ionosphere at the target geomagnetic measurement altitude is determined according to the electron magnetic rotation frequency at the target geomagnetic measurement altitude.
2. The method according to claim 1, characterized in that Based on the electron temperature disturbance profile time series, the height that meets the ionospheric peak height condition is determined as the target geomagnetic measurement height, including: Based on the time series of electron temperature perturbation profile, the perturbation trend of electron temperature along the geomagnetic field at different pump wave frequencies is obtained; Based on the disturbance trend of electron temperature along the geomagnetic field at different pump wave frequencies, multiple geomagnetic measurement heights are determined; Determine the intensity of the step perturbation of the electron temperature with the pump wave frequency at each geomagnetic measurement altitude; The geomagnetic measurement altitude with the largest electron temperature step disturbance intensity is selected as the target geomagnetic measurement altitude.
3. The method according to claim 2, characterized in that Based on the electron temperature disturbance time sequence and the heating pump pump wave frequency time sequence at the target geomagnetic measurement altitude, the electron magnetic rotation frequency at the target geomagnetic measurement altitude is determined, including: Determine a pump wave broadening frequency band; wherein the pump wave broadening frequency band is composed of a pump wave frequency lower limit value and a pump wave frequency upper limit value; Based on the electron temperature perturbation time sequence at the target geomagnetic measurement altitude, the first electron temperature step perturbation moment close to the upper limit of the pump wave frequency in each pump wave cycle is determined as the target step perturbation moment; Based on the pump wave frequency timing of the heating pump, determine the pump wave frequency that is different from the upper and lower limits of the pump wave frequency and corresponds to the target step disturbance moment as the target pump wave frequency; The electron magnetic rotation frequency at the target geomagnetic measurement altitude is determined according to the target pump wave frequency.
4. The method according to claim 3, characterized in that: According to the target pump wave frequency, the electron magnetic rotation frequency at the target geomagnetic measurement altitude is determined, including: Obtain the pump wave frequency band multiple number of the incoherent scatter radar in the observation mode; The electron magnetic rotation frequency at the target geomagnetic measurement altitude is determined according to the ratio of the target pump wave frequency to the multiple frequency number of the pump wave frequency band.
5. The method according to any one of claims 1 to 4, characterized in that: According to the electron magnetic rotation frequency at the target geomagnetic measurement altitude, the geomagnetic field strength of the ionosphere at the target geomagnetic measurement altitude is determined, including: according to Determine the geomagnetic field strength of the ionosphere at the target geomagnetic measurement altitude; Among them, f ce 、m e , e represent the electron magnetic rotation frequency, electron mass and electron charge respectively.
6. The method according to any one of claims 1 to 4, characterized in that: Obtain observation data of incoherent scatter radar in observation mode, including: Determine an estimate of the ionospheric peak altitude; Based on the estimated value of the ionospheric peak height, the pump wave broadening band is constructed; Configure the heating pump according to the pump wave broadening frequency band and pump wave parameters; The incoherent scattering radar is configured according to the set detection parameters to invert the observation mode of electron temperature.
7. The method according to claim 6, characterized in that Based on the estimated value of the ionospheric peak height, the pump wave broadening band is constructed, including: Obtaining an estimated value of the electron magnetic rotation frequency corresponding to the estimated value of the ionosphere peak height and an estimated value of the peak frequency corresponding to the estimated value of the ionosphere peak height; Obtaining a ratio of a peak frequency estimate corresponding to an ionospheric peak height estimate to an electron magnetic rotation frequency estimate corresponding to an ionospheric peak height estimate and rounding the ratio to determine the rounding result as a pump wave frequency band multiple; The pump wave center frequency is determined according to the product of the estimated value of the electron magnetic rotation frequency and the frequency multiple of the pump wave frequency band; Frequency broadening is performed based on the center frequency of the pump wave to determine the pump wave broadening frequency band.
8. A device for measuring the ionospheric magnetic field strength, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for measuring the ionospheric magnetic field strength as described in any one of claims 1 to 7 when running the program instructions.
9. An observation device for measuring the ionospheric magnetic field strength, characterized in that: include: Observation equipment body; The device for measuring the ionospheric magnetic field strength as described in claim 8 is installed on the observation equipment body.
10. A computer-readable storage medium storing program instructions, characterized in that: When the program instructions are executed, the computer is used to execute the method for measuring the ionospheric magnetic field strength as described in any one of claims 1 to 7.