Separation of the ionospheric and thermospheric contributions in the data from the Triple Ionosophere Photo Meter onboard the Feng-Yun 3E satellite  

作　　者：Fang JIANG Tian MAO Jin-Song WANG Xiu-Qing HU Xiao-Xin ZHANG Liping FU Nan JIA Tianfang WANG 

机构地区：[1]National Space Science Center,Chinese Academy of Sciences,Beijing,100090,China [2]Beijing Key Laboratory of Space Environment Exploration,Beijing,100090,China [3]Key Laboratory of Environmental Space Situation Awareness Technology,Beijing,100090,China [4]National Satellite Meteorological Center,China Meteorological Administration,Beijing,100081,China

出　　处：《Science China Earth Sciences》2025年第1期172-184,共13页中国科学(地球科学英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.41874187)。

摘　　要：The Triple Ionosphere Photo Meter(TRIPM)is a far ultraviolet nadir-view photometer that is onboard the secondgeneration,polar-orbiting Chinese meteorological satellite Feng-Yun 3E(FY-3E),which was launched on July 5,2021.TRIPM has three channels,and each is used to measure different types of emissions:(1)135.6 nm airglow produced by the recombination of the O+ions and electrons in the absence of sunlight(nighttime channel);(2)135.6 nm airglow from the OI when sunlight is present(daytime/dusk-dawn 135.6 nm channel);and(3)Airglow in the N_(2)LBH of the TRIPM(daytime/dusk-dawn N_(2)LBH channel).FY-3E is a satellite operating in the early morning orbit.Therefore,the data are mostly distributed on the dawndusk side or at times when the solar zenith angle is relatively large.In this study,combined with simulation calculations,the data are analysed.To further explore the application value of the data products,a model is used to separate the ionospheric radiative recombination contribution from the thermosphere photoelectron impact excitation contribution in the data from the daytime/dusk-dawn 135.6 nm channel.This approach not only improves the accuracy of O/N_(2)derived from the 135.6 nm channel and N_(2)LBH channel but also provides the ionospheric 135.6 nm radiance at the same time as the product.The results show that the 135.6 nm radiance originating from the combination of O+and electrons extracted from the measurement data exhibits similar equatorial anomaly peak structure characteristics and seasonal variations as the corresponding GPS total electron content(TEC)data.On the other hand,the separated 135.6 nm radiance generated from the thermosphere photoelectron collision excitation does not contain radiative recombination contributions;thus,the ionosphere influence is greatly avoided when the O/N_(2)is obtained.

关 键 词：Far ultraviolet 135.6 nm emission intensity Photoelectron impact excitation Radiative recombination excitation 

分 类 号：P35[天文地球—空间物理学]