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空间科学学报 ›› 2015, Vol. 35 ›› Issue (2): 192-202.doi: 10.11728/cjss2015.02.192

• 日球层物理和太阳系探测 • 上一篇    下一篇

基于SAMPEX卫星观测的南大西洋异常区高能质子动态分布特征

吕景天1,2, 张效信2, 林瑞淋3, 何飞4, 蒋勇1   

  1. 1. 南京信息工程大学数学与统计学院 南京 210044;
    2. 中国气象局国家空间天气监测预警中心 北京 100081;
    3. 中国科学院空间科学与应用研究中心 北京 100190;
    4. 中国科学院长春光学精密机械与物理研究所 长春 130033
  • 收稿日期:2014-03-03 修回日期:2014-10-14 出版日期:2015-02-15 发布日期:2015-03-04
  • 通讯作者: 张效信 E-mail:xxzhang@cma.gov.cn
  • 基金资助:

    国家重点基础研究发展计划项目资助(2012CB957803)

Dynamic Distribution Features of Energetic Proton in South Atlantic Anomaly Based on the Observation of SAMPEX

LÜ Jingtian1,2, ZHANG Xiaoxin2, LIN Ruilin3, HE Fei4, JIANG Yong1   

  1. 1 School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing 210044;
    2 National Center for Space Weather, China Meteorological Administration, Beijing 100081;
    3 Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190;
    4 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033
  • Received:2014-03-03 Revised:2014-10-14 Online:2015-02-15 Published:2015-03-04

摘要:

利用SAMPEX卫星1992年7月至2004年6月19~27MeV高能质子数据对南大西洋异常区的分布特征进行研究, 发现南大西洋异常区高能质子分布随高度及F10.7的变化十分显著. 在540±25km高度上, 地磁较为平静时期南大西洋异常区高能质子微分通量随着F10.7的增大而减小, 同时在F10.7≥115sfu时减小趋势较为平缓. 对中等及以上磁暴进行统计分析发现, 磁暴期间南大西洋异常区高能质子微分通量和SYM-H指数的绝对值存在明显的反相关关系, 且地磁暴对南大西洋异常区高能质子微分通量存在明显的持续影响效应. 磁暴发生期间高能质子微分通量明显减少. 磁暴恢复相及其之后高能质子微分通量呈现较为显著的恢复过程.

关键词: 内辐射带, 南大西洋异常区, 磁暴, 高能质子微分通量, F10.7指数

Abstract:

After lots of experiments by using 19~27MeV differential energetic proton data based on the observation of SAMPEX from July of 1992 to June of 2004, it is found that the change of F10.7 and altitude have a great influence on the distribution of differential energetic proton flux in South Atlantic Anomaly. During the geomagnetic quiet time at 540±25km altitude, the energetic proton flux in South Atlantic Anomaly decreased with the increasing of F10.7, and the variation trend was flat when F10.7≥115sfu. It is found that there was obviously an anti-correlation between the absolute value of SYM-H and the differential energetic proton flux in South Atlantic Anomaly for storms with SYM-H<-50, and also there was a lasting effect on differential energetic proton flux in South Atlantic Anomaly. In addition, the proton flux could be significantly reduced in South Atlantic Anomaly during the main phase, while the proton flux showed a substantial resuming trend in the recovery phase of geomagnetic storms.

Key words: Inner radiation belt, South Atlantic Anomaly, Geomagnetic storm, Differential energetic proton flux, F10.7 index

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