| DOI: | 10.1002/2015GL063370
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| 论文题名: | Magnetic field depression within electron holes |
| 作者: | Vasko I.Y.; Agapitov O.V.; Mozer F.; Artemyev A.V.; Jovanovic D.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8792
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| EISSN: | 1944-8523
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| 出版年: | 2015
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| 卷: | 42, 期:7 | | 起始页码: | 2123
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| 结束页码: | 2129
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| 语种: | 英语
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| 英文关键词: | diamagnetic effect
; electron hole
; outer radiation belt
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| Scopus关键词: | Anisotropy
; Hot electrons
; Magnetic fields
; Plasma density
; Plasma sheaths
; Radiation belts
; Anisotropic plasmas
; Diamagnetic currents
; Diamagnetic effects
; Electron hole
; Outer radiation belt
; Plasma properties
; Temperature anisotropy
; Trapped electrons
; Electrons
; anisotropy
; magnetic field
; plasma
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| 英文摘要: | We analyze electron holes that are spikes of the electrostatic field (up to 500 mV/m) observed by Van Allen Probes in the outer radiation belt. The unexpected feature is the magnetic field depression of about several tens of picotesla within many of the spikes. The earlier observations showed amplification or negligible perturbations of the magnetic field within the electron holes. We suggest that the observed magnetic field depression is due to the diamagnetic current of hot and highly anisotropic population of electrons trapped within the electron holes. The required trapped population should have a density up to 65% of the background plasma density, a temperature up to several keV, and a temperature anisotropy Tτ/T∥∼2. We argue that the observed electron holes could be generated due to injections of highly anisotropic plasma sheet electrons into the outer radiation belt. These electron holes may present a source of the seed population due to transport of trapped electrons to higher latitudes and can be potentially used for distant probing of plasma properties in their source region. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928706323&doi=10.1002%2f2015GL063370&partnerID=40&md5=435114622f1b888667e1ed5dc3fa0fcf
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8408
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Space Research Institute, RAS, Moscow, Russian Federation
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| Recommended Citation: | |
Vasko I.Y.,Agapitov O.V.,Mozer F.,et al. Magnetic field depression within electron holes[J]. Geophysical Research Letters,2015-01-01,42(7).
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