globalchange  > 气候减缓与适应
DOI: 10.1002/grl.50916
论文题名:
High-speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves
作者: Miyoshi Y.; Kataoka R.; Kasahara Y.; Kumamoto A.; Nagai T.; Thomsen M.F.
刊名: Geophysical Research Letters
ISSN: 0094-8582
EISSN: 1944-8313
出版年: 2013
卷: 40, 期:17
起始页码: 4520
结束页码: 4525
语种: 英语
英文关键词: radiation belts ; wave particle interactions
Scopus关键词: Acceleration mechanisms ; Electron acceleration ; High-speed solar wind ; High-speed solar wind streams ; Interplanetary magnetic fields ; Outer radiation belt ; Relativistic electron ; Wave-particle interactions ; Electrons ; Magnetic fields ; Plasma density ; Solar energy ; Solar wind ; Radiation belts ; electron ; interplanetary dust ; magnetic field ; plasma ; solar cycle ; solar wind
英文摘要: Relativistic electron flux in the outer radiation belt tends to increase during the high-speed solar wind stream (HSS) events. However, HSS events do not always cause large flux enhancement. To determine the HSS events that cause such enhancement and the mechanisms that are responsible for accelerating the electrons, we analyzed long-term plasma data sets, for periods longer than one solar cycle. We demonstrate that during HSS events with the southward interplanetary magnetic field (IMF)-dominant HSS (SBz-HSS), relativistic electrons are accelerated by whistler mode waves; however, during HSS events with the northward IMF-dominant HSS, this acceleration mechanism is not effective. The differences in the responses of the outer radiation belt flux variations are caused by the differences in the whistler mode wave-electron interactions associated with a series of substorms. During SBz-HSS events, hot electron injections occur and the thermal plasma density decreases due to the shrinkage of the plasmapause, causing large flux enhancement of relativistic electrons through whistler mode wave excitation. These results explain why large flux enhancement of relativistic electrons tends to occur during SBz-HSS events. Key Points A causal link between the solar wind and radiation belt flux enhancements Southward IMF causes the enhanced condition of whistler chorus Whistler chorus is a fundamental driver to cause the electron acceleration ©2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883705838&doi=10.1002%2fgrl.50916&partnerID=40&md5=e0277ba0d6b9d25c927c0f0b106b40c6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5846
Appears in Collections:气候减缓与适应

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作者单位: Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan

Recommended Citation:
Miyoshi Y.,Kataoka R.,Kasahara Y.,et al. High-speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves[J]. Geophysical Research Letters,2013-01-01,40(17).
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