globalchange  > 气候减缓与适应
DOI: 10.1002/grl.50837
论文题名:
Storm-induced energization of radiation belt electrons: Effect of wave obliquity
作者: Artemyev A.V.; Agapitov O.V.; Mourenas D.; Krasnoselskikh V.; Zelenyi L.M.
刊名: Geophysical Research Letters
ISSN: 0094-8650
EISSN: 1944-8381
出版年: 2013
卷: 40, 期:16
起始页码: 4138
结束页码: 4143
语种: 英语
英文关键词: magnetic storm ; radiation belts ; wave-particle interaction
Scopus关键词: Cluster statistics ; Electron acceleration ; Geomagnetic activities ; Magnetic storms ; Numerical calculation ; Radiation belt electrons ; Suprathermal electrons ; Wave-particle interactions ; Electromagnetic waves ; Geomagnetism ; Plasma accelerators ; Storms ; Wave power ; Radiation belts ; belt ; disturbance ; electron ; geomagnetic field ; linearity ; radiation balance ; storm ; wave attenuation
英文摘要: New Cluster statistics allow us to determine for the first time the variations of both the obliquity and intensity of lower-band chorus waves as functions of latitude and geomagnetic activity near L∼5. The portion of wave power in very oblique waves decreases during highly disturbed periods, consistent with increased Landau damping by inward-penetrating suprathermal electrons. Simple analytical considerations as well as full numerical calculations of quasi-linear diffusion rates demonstrate that early-time electron acceleration occurs in a regime of loss-limited energization. In this regime, the average wave obliquity plays a critical role in mitigating lifetime reduction as wave intensity increases with geomagnetic activity, suggesting that much larger energization levels should be reached during the early recovery phase of storms than during quiet time or moderate disturbances, the latter corresponding to stronger losses. These new effects should be included in realistic radiation belt simulations. Key Points Chorus wave obliquity and intensity of as functions of geomagnetic activity Early-time electron acceleration occurs in a regime of loss-limited energization Larger energization levels should be reached during the early recovery phase. © 2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881639594&doi=10.1002%2fgrl.50837&partnerID=40&md5=a83b893bf268320ff47b191964e6599f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5914
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作者单位: LPC2E/CNRS, University of Orleans, Orleans, France

Recommended Citation:
Artemyev A.V.,Agapitov O.V.,Mourenas D.,et al. Storm-induced energization of radiation belt electrons: Effect of wave obliquity[J]. Geophysical Research Letters,2013-01-01,40(16).
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