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Chinese Journal of Space Science ›› 2015, Vol. 35 ›› Issue (2): 192-202.doi: 10.11728/cjss2015.02.192

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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

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

CLC Number: