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Study on geomagnetic storms driving motion of 0.1-2 MeV radiation belt electrons
Zhang, ZX; Li XQ(李新乔); Li, XQ
2016
发表期刊ADVANCES IN SPACE RESEARCH
卷号58期号:4页码:587
文章类型Article
摘要Using more than five years' worth of data observed by the Instrument for the Detection of Particles (IDP) spectrometer onboard the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) satellite, we studied the motion characteristics of energetic electrons in different regions, i.e., the inner radiation belt, the outer radiation belt, and the slot region in geomagnetic storms. We investigated the flux change of 0.1-2.4 MeV electrons and the energy change of 0.1-1.0 MeV electrons in these different regions. By cross correlation analysis, we came to the following conclusions. First, when Dst < 50, the correlation coefficient (c.c.) of the electron flux and Dst index ranges from -0.63 to -0.86, and the enhancement of the electron flux generally occurs during the storm's main and recovery phases. Second, the storms greatly influence the lower energy region of the electron energy spectrum in the inner radiation belt, while the enhancement in the higher energy region is more significant in the outer radiation belt and the slot region. Third, the effects of geomagnetic storms on electrons are not distinguished significantly between in the day and night, and independent of the timing of the events. For storms with 50 < Dst < 30, there is a negative correlation of -0.51 to -0.57 between the Dst index and the electron flux in the outer radiation belt. Our analysis suggests that strong storms cause energetic electron ejections across a wide range, and the ejection level is affected by the storm intensity. Furthermore, the electron energy region influenced by the strong geomagnetic storms is opposite in the inner and outer radiation belts. The proportion of electrons accelerated to relativistic energies is greater in the outer radiation and slot regions, while the ejection energetic electrons are more concentrated in the low energy region of the inner radiation belt. This phenomenon reflects the different electron injection mechanisms and accelerating processes responsible for spectral index variations in different L regions during geomagnetic storms. (C) 2016 COSPAR. Published by Elsevier Ltd. All rights reserved.
关键词Geomagnetic storms Energetic electrons Spectral index Flux Cross correlation
DOI10.1016/j.asr.2016.05.006
关键词[WOS]RELATIVISTIC ELECTRONS ; ACCELERATION ; DEMETER
语种英语
WOS记录号WOS:000380417000012
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260704
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Zhang, ZX,Li XQ,Li, XQ. Study on geomagnetic storms driving motion of 0.1-2 MeV radiation belt electrons[J]. ADVANCES IN SPACE RESEARCH,2016,58(4):587.
APA Zhang, ZX,李新乔,&Li, XQ.(2016).Study on geomagnetic storms driving motion of 0.1-2 MeV radiation belt electrons.ADVANCES IN SPACE RESEARCH,58(4),587.
MLA Zhang, ZX,et al."Study on geomagnetic storms driving motion of 0.1-2 MeV radiation belt electrons".ADVANCES IN SPACE RESEARCH 58.4(2016):587.
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