Space extreme ultraviolet solar telescope in-orbit radiometric calibration method

Abstract

A space extreme ultraviolet solar telescope in-orbit radiometric calibration method relates to the field of extreme ultraviolet telescope radiometric calibration, and comprises the following steps: designing a solar extreme ultraviolet illumination calibration channel; carrying out ground illuminance response calibration of the solar extreme ultraviolet illuminance calibration channel; after a space extreme ultraviolet solar telescope is launched into an orbit along with a satellite, carrying out in-orbit radiation brightness calibration by using a solar extreme ultraviolet illumination calibration channel at regular intervals; during in-orbit calibration, the extreme ultraviolet illuminance calibration channel can calibrate the extreme ultraviolet illuminance of the sun at the entrance of the extreme ultraviolet solar telescope, and telescope image plane uniformity distribution data and sun image gray scale data are obtained through in-orbit flat field calibration according to the data, and the radiance responsivity of each pixel of an image surface detector in the extreme ultraviolet solar telescope can be calibrated. The system is high in radiometric calibration precision, small in size and weight and good in space applicability, high-precision in-orbit radiometric calibration can be carried out on a space solar extreme ultraviolet camera, and high-precision quantitative remote sensing observation of the sun in an extreme ultraviolet band is met.

Description

technical field [0001] The invention relates to the technical field of extreme ultraviolet telescope radiation calibration, in particular to an on-orbit radiation calibration method for a space extreme ultraviolet solar telescope. Background technique [0002] As the main source of energy for the earth, the sun's changes directly affect space weather and global climate change, while intense solar activity events such as flares and coronal mass ejections are the main factors leading to space weather anomalies. At present, extreme ultraviolet (EUV) band imaging is the main means of observing the solar transition zone and the corona, which can obtain information about solar flares, coronal mass ejections, etc., make early forecasts of solar activities, warn of disastrous space weather events, and provide space weather data Products that serve human space activities and national defense construction. [0003] In order to accurately retrieve imaging data, solar extreme ultraviol...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an on-orbit radiation calibration method for space extreme ultraviolet solar telescopes to solve the problems of low ground radiation calibration accuracy and attenuation of on-orbit working radiation response performance existing in existing extreme ultraviolet band solar imaging instruments. The technical problem of not being able to conduct high-precision quantitative remote sensing observations of the sun

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