王春琴^1,2,3,,
张贤国^1,2,3,
沈国红^1,2,3,
张珅毅^1,2,3,
张效信⁴,
黄聪⁴,
李兴冀⁵
1. 中国科学院国家空间科学中心, 北京 100190
2. 天基空间环境探测北京市重点实验室, 北京 100190
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. 中国气象局国家空间天气监测预警中心, 北京 100081
5. 哈尔滨工业大学, 哈尔滨 150001

基金项目: 国家自然科学基金(11603028，11305234)资助


详细信息

作者简介: 王春琴, 女, 1978年生, 博士, 毕业于中国科学院大学, 主要从事空间粒子辐射探测数据的处理及分析研究工作.E-mail: wcq@nssc.ac.cn

中图分类号: P353

收稿日期:2020-09-04
修回日期:2021-02-02
上线日期:2021-06-10

Dynamic results of electron flux in radiation belt from 2011 to 2015 based on FY-3B satellite observation

WANG ChunQin^1,2,3,,
ZHANG XianGuo^1,2,3,
SHEN GuoHong^1,2,3,
ZHANG ShenYi^1,2,3,
ZHANG XiaoXin⁴,
HUANG Cong⁴,
LI XingJi⁵
1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2. Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China
3. Environmental Space Situation Awareness-SSA, Beijing 100190, China
4. National Center for Space Weather, China Meteorological Administration, Beijing 100081, China
5. Harbin Institute of Technology, Harbin 150001, China


MSC: P353

--> Received Date: 04 September 2020
Revised Date: 02 February 2021
Available Online: 10 June 2021


摘要
摘要:FY-3B卫星为轨道高度约800 km，倾角98°的极轨气象卫星，星上高能电子探测器可开展宽能谱、高时间分辨的电子辐射长时间连续监测.2011-2015年极低太阳活动周期内，FY-3B卫星高能电子探测器对0.15~5.7 MeV不同能量高能电子在南大西洋异常区以外的辐射带区域的观测结果显示：在所有的辐射带区域，低能量的电子比高能量的电子更容易出现增强，填充槽区和进入到内带更低L区域的可能性更大.0.15~0.35 MeV的电子长期充斥于外辐射带和槽区，而1 MeV以上的电子大部分时间分布于外辐射带，在太阳风速度、地磁活动极弱的2014年呈现长时间极弱通量水平.2015年频繁增强的扰动导致电子通量水平整体升高，空间分布大范围扩散，1 MeV以上能量的电子在槽区位置也出现了分布.分析2014.5.10-7.30和2015.5.10-7.10两个典型时段内扰动参数对电子通量在不同区域动态分布的影响，结果表明：电子通量在外辐射带外边界区域动态与太阳风起伏变化关联显著.AE < 300 nT，Dst>-30 nT，SW < 500 km·s^-1的持续长时间低水平扰动条件下，电子通量分布内边界出现在不低于L~4的位置，通量峰值出现在靠近L~5的位置；而在太阳风速度和地磁活动显著活跃的时候，电子会穿越外辐射带深入到槽区，在外辐射带的通量峰值则出现在L约3.5~3.9的位置.2015年的3月和6月两起强磁暴使得电子向更低L注入，>1 MeV以上的电子在低至L~2.8的槽区出现显著增长.在极低通量水平下，AE指数短时增加超过300 nT的亚暴活动会导致0.15~0.35 MeV电子超过1个量级的增长变化.上述结果对于准确认识辐射带电子不同时期的基本特性、发现能量电子动态潜在的基本物理过程，构建更准确的辐射带电子模型有着重要的参考意义.
关键词: FY-3B卫星/
高能电子/
辐射带

Abstract:FY-3B satellite is a polar orbiting meteorological satellite with an orbit altitude of 800 km and an inclination of 98°. The onboard High-energy Electron Detector (HEED) can carry out long-term continuous monitoring of electron radiation with wide energy spectrum and high time resolution. Based on the observation data of HEED during 2011-2015, the detailed spatial dynamic distributions of 0.15~5.7 MeV electrons are obtained. The results show that the lower the energy, the higher the frequency of electron increasing, and the wider the spatial distribution. Electrons with energy of 0.15~0.35 MeV remain in the outer radiation zone and slot region for a long time. The electrons above 1 MeV always located in the outer belt and even weakened to the background flux level in most of 2014.Frequent enhanced disturbance in 2015 led to the overall increase in the electron flux level. The spatial distribution range of electron larger than 1 MeV can even spread to the slot. The influence of different disturbance parameters on regional distribution of electron flux during the two periods from May to July 2014 and May to July 2015 is analyzed. At the outer boundary of the outer radiation belt, the electron flux is significantly affected by the periodic modulation of the solar wind velocity. Solar wind speed and geomagnetic activity can affect the inner edge and peak position of the out belt. The stronger the magnetic storm, the deeper the injection depth and the lower the L value. Under the influence of the strong magnetic storm in March and June 2015, even more than 1 MeV electron increased significantly at position as low as L~2.8. On the condition of extremely low background, substorm over 300 nT can result in an increase more than an order of magnitude in the electron flux of 0.15~0.35 MeV. These results have important reference for accurately understanding the basic characteristics of electrons in different periods, discovering the basic physical processes of dynamic energy electrons, and constructing more accurate electron model.
Key words:FY-3B satellite/
Energy electron/
Radiation belt



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