DOI: 10.1002/2015GL065342
论文题名: Solar wind conditions leading to efficient radiation belt electron acceleration: A superposed epoch analysis
作者: Li W. ; Thorne R.M. ; Bortnik J. ; Baker D.N. ; Reeves G.D. ; Kanekal S.G. ; Spence H.E. ; Green J.C.
刊名: Geophysical Research Letters
ISSN: 0094-9354
EISSN: 1944-9085
出版年: 2015
卷: 42, 期: 17 起始页码: 6906
结束页码: 6915
语种: 英语
英文关键词: chorus wave
; electron acceleration
; solar wind conditions
Scopus关键词: Atmospherics
; Electromagnetic waves
; Electrons
; Geomagnetism
; Plasma accelerators
; Radiation belts
; Solar wind
; Wind
; Chorus waves
; Electron acceleration
; Geomagnetic indices
; Outer radiation belt
; Radiation belt electrons
; Solar wind parameters
; Superposed-epoch analysis
; Wind conditions
; Acceleration
; acceleration
; electron
; geomagnetic field
; solar power
; wave power
; wind power
英文摘要: Determining preferential solar wind conditions leading to efficient radiation belt electron acceleration is crucial for predicting radiation belt electron dynamics. Using Van Allen Probes electron observations (>1 MeV) from 2012 to 2015, we identify a number of efficient and inefficient acceleration events separately to perform a superposed epoch analysis of the corresponding solar wind parameters and geomagnetic indices. By directly comparing efficient and inefficient acceleration events, we clearly show that prolonged southward Bz, high solar wind speed, and low dynamic pressure are critical for electron acceleration to >1 MeV energies in the heart of the outer radiation belt. We also evaluate chorus wave evolution using the superposed epoch analysis for the identified efficient and inefficient acceleration events and find that chorus wave intensity is much stronger and lasts longer during efficient electron acceleration events, supporting the scenario that chorus waves play a key role in MeV electron acceleration. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943352643&doi=10.1002%2f2015GL065342&partnerID=40&md5=ab1d26cf5dd7cf92107366db8d3172a5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8969
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: Department of Atmospheric and Oceanic Sciences, UCLA, Los Angeles, CA, United States
Recommended Citation:
Li W.,Thorne R.M.,Bortnik J.,et al. Solar wind conditions leading to efficient radiation belt electron acceleration: A superposed epoch analysis[J]. Geophysical Research Letters,2015-01-01,42(17).