孙晓婧^1,2,3,,
林瑞淋^1,3,,,
刘四清^1,2,3,
师立勤^1,2,3,
张效信⁴,
钟秋珍^1,2,3,
罗冰显^1,2,3,
龚建村^3,5,
程永宏^1,3
1. 中国科学院国家空间科学中心, 北京 100190
2. 中国科学院大学, 北京 100049
3. 中国科学院空间环境态势感知技术重点实验室, 北京 100190
4. 国家卫星气象中心空间天气重点实验室, 北京 100081
5. 中国科学院上海微小卫星工程中心, 上海 200050

基金项目: 自然科学青年科学基金项目（41604143）资助


详细信息

作者简介: 孙晓婧, 女, 1995年生, 博士研究生, 主要从事高能电子方面研究.E-mail:sunxiaojing17@mails.ucas.ac.cn

通讯作者: 林瑞淋, 男, 1982年生, 副研究员, 博士, 主要从事地球辐射带研究.E-mail:linrl@nssc.ac.cn

中图分类号: P353

收稿日期:2020-03-03
修回日期:2020-08-06
上线日期:2020-10-05

Influence of geomagnetic field structure on ≥2 MeV electron distribution at the geostationary orbit

SUN XiaoJing^1,2,3,,
LIN RuiLin^1,3,,,
LIU SiQing^1,2,3,
SHI LiQin^1,2,3,
ZHANG XiaoXin⁴,
ZHONG QiuZhen^1,2,3,
LUO BingXian^1,2,3,
GONG JianCun^3,5,
CHENG YongHong^1,3
1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Key Laboratory of Science and Technology on Environmental Space Situation Awareness, Chinese Academy of Sciences, Beijing 100190, China
4. Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing 100081, China
5. Innovation Academy for Microsatellites of Chinese Academy of Sciences, Shanghai 200050, China


More Information

Corresponding author: LIN RuiLin,E-mail:linrl@nssc.ac.cn

MSC: P353

--> Received Date: 03 March 2020
Revised Date: 06 August 2020
Available Online: 05 October 2020


摘要
摘要:基于AE8电子辐射带模式和各地磁场模式，本文系统分析了地磁场模式、太阳风、地磁扰动、地磁轴指向对静止轨道≥2 MeV高能电子分布的影响以及静止轨道不同经度位置≥2 MeV高能电子分布的差异，并与GOES系列卫星实测结果进行了对比分析. 结果表明，AE8+IGRF+T96模式所得静止轨道≥2 MeV高能电子分布结果优于AE8+IGRF+OPQ77模式或AE8+IGRF+T89模式结果，其大部分定性结果与GOES系列卫星观测结果较为一致，AE8+IGRF+T96模式所得静止轨道≥2 MeV高能电子分布与磁壳参量Lm、局地磁场B分别呈较好的负和正相关性. 基于AE8+IGRF+T96模式得到在相同太阳风及地磁扰动条件下2010年每分钟静止轨道≥2 MeV高能电子通量分布结果，经分析得到：1年内每个时刻静止轨道上≥2 MeV高能电子通量最大值和最小值比值变化范围为2.50~7.51，变化主周期为1天，每天比值变化量都超过3；1年内静止轨道各经度位置每天内≥2 MeV高能电子通量最大值和最小值比值变化范围为2.98~6.00，比值随着时间和经度位置而变化；1年内同一天静止轨道各经度位置≥2 MeV高能电子日积分通量最大值出现在170°W附近，最小值出现在70°W附近，最大值与最小值的比值分布在1.86~2.13之间. 以上所得静止轨道≥2 MeV高能电子分布变化主要来自Lm变化，B/B₀的影响小于5%，其中B₀为磁力线上磁场最小值. 因此，在构建≥2 MeV高能电子分布模式时，需要考虑地磁场结构的影响，特别是Lm参数.
关键词: 静止轨道/
≥2 MeV高能电子通量/
地磁场结构/
高能电子预报模式

Abstract:Based on AE8 electron radiation belt model and various geomagnetic field models, we analyzed the effects of geomagnetic field models, solar wind, geomagnetic disturbance and the pointing of geomagnetic axis on ≥2 MeV electron distribution at the geostationary orbit, examined the differences of ≥2 MeV electron distribution at different longitudes of the geostationary orbit, and made a comparison between the results from models and the observations from GOES satellites. It is shown that the results of ≥2 MeV electron fluxes at the geostationary orbit from AE8+IGRF+T96 model are better than those from AE8+IGRF+OPQ77 model or AE8+IGRF+T89 model, most of qualitative results from AE8+IGRF+T96 model are consistent with observations from GOES satellites, and ≥2 MeV electron fluxes at the geostationary orbit from AE8+IGRF+T96 model have a good negative correlation with magnetic shell parameter Lm and a good positive correlation with local magnetic field B. Based on the AE8+IGRF+T96 model, ≥2 MeV electron fluxes at the geostationary orbit each minute during 2010 are calculated by the assumption of constant solar wind conditions and geomagnetic disturbances. The data reveal that the ratios of the maximal to minimal values of ≥2 MeV electron fluxes at the geostationary orbit each minute vary from 2.50 to 7.51 in one year, with a main period of 1 day and the variation of ratios each day more than 3, the ratios of the maximal to minimal values of ≥2 MeV electron fluxes for any geostationary satellite each day are within the range from 2.98 to 6.00 in one year, varying with the time and the location, and the maximum and minimum values of ≥2 MeV electron daily fluences for the geostationary satellites at the same day in one year appear near 170°W and 70°W, respectively, with their the ratios varying from 1.86~2.13. The variations of ≥2 MeV electron distribution at the geostationary orbit above are mainly due to Lm, and the effect of B/B₀ is less than 5%, where B₀ is the minimal value of magnetic field at any field line. Therefore, the influence of geomagnetic field structure, especially the Lm parameter, should be considered for developing the model of ≥2 MeV high energy electron flux distribution at the geostationary orbit.
Key words:Geostationary orbit/
≥2 MeV electron fluxes/
Geomagnetic field structure/
Prediction model of high energy electron



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