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Ionized layer equivalent current system hour-by-hour inversion method introducing CM model

A technology of equivalent current and ionosphere, used in radio wave measurement systems, re-radiation of sound waves, and electrical/magnetic exploration. It can solve problems such as uneven distribution and achieve high precision and good stability.

Pending Publication Date: 2022-04-26
INST OF EARTHQUAKE SCI CHINA EARTHQUAKE ADMINISTATION
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Problems solved by technology

In addition, overcoming the uneven distribution of global stations and obtaining ideal global grid data of the geomagnetic diurnal field is the key to realizing the stability of the ionospheric equivalent current hourly inversion

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  • Ionized layer equivalent current system hour-by-hour inversion method introducing CM model
  • Ionized layer equivalent current system hour-by-hour inversion method introducing CM model
  • Ionized layer equivalent current system hour-by-hour inversion method introducing CM model

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Embodiment Construction

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] Such as figure 1 Shown:

[0040] First, collect and record the raw data x(t), y(t), and z(t) of geomagnetic field vectors from global geomagnetic stations.

[0041] Next, eliminate long-term changes and trend item changes for a single original data x(t), y(t), and z(t), and obtain dx(t), dy(t), and dz(t), where t hours are sampled Rate.

[0042] Perform principal component analysis on a single original dx(t), dy(t), and dz(t), that is, ...

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Abstract

The invention discloses an ionosphere equivalent current system hour-by-hour inversion method introducing a CM model, and the method comprises the steps: collecting and recording the original data of a geomagnetic field vector of a global geomagnetic station, eliminating the background changes of a long-term term, a trend term and the like in the original data, carrying out the principal component analysis of single data, and obtaining the components of a geomagnetic daily variation field; taking the data as geomagnetic daily variation field basic data of ionosphere equivalent current hour-by-hour inversion; and calculating model magnetic field data of global grid point ionospheric current magnetic field components by using a CM magnetic field model. Further combining measured data and model data to carry out gridding interpolation to obtain global geomagnetic daily variation field data inversed hour by hour by using the equivalent current of the ionized layer; and finally, based on a spherical harmonic analysis method, carrying out internal and external source field separation on the global geomagnetic daily variation field gridding data to obtain an ionosphere equivalent current magnetic potential corresponding to an external source field, and carrying out inversion calculation according to a magnetic field and current relational expression given by the Biot-Saval law to obtain hour-by-hour ionosphere equivalent current.

Description

technical field [0001] The invention belongs to the field of digital combing and research of the earth's changing magnetic field and ionospheric current data, and relates to an hourly inversion method of an ionospheric equivalent current system introduced into a CM model. Background technique [0002] The inversion algorithm of the ionospheric equivalent current system is based on the geomagnetic potential field theory proposed by the mathematician Gauss in 1839. With the help of the Gauss-Schmidt method, the basic magnetic field of the earth can be divided into two parts: internal and external. The basic idea of ​​the algorithm is: assuming that the current that generates the magnetic field is located on a two-dimensional spherical shell at a certain height (such as the E region of the ionosphere), first use the forward modeling method (spherical harmonic analysis theory) to establish the magnetic field generated by the known current system Then the Gaussian coefficient is ...

Claims

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Application Information

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IPC IPC(8): G01V3/38G01V3/40G06F30/20
CPCG01V3/38G01V3/40G06F30/20
Inventor 吴迎燕吕晓健
Owner INST OF EARTHQUAKE SCI CHINA EARTHQUAKE ADMINISTATION