DOI: 10.1002/2014GL060252
论文题名: Evidence of strong energetic ion acceleration in the near-Earth magnetotail
作者: Luo H. ; Kronberg E.A. ; Grigorenko E.E. ; Fränz M. ; Daly P.W. ; Chen G.X. ; Du A.M. ; Kistler L.M. ; Wei Y.
刊名: Geophysical Research Letters
ISSN: 0094-10539
EISSN: 1944-10270
出版年: 2014
卷: 41, 期: 11 起始页码: 3724
结束页码: 3730
语种: 英语
英文关键词: acceleration
; anisotropy
; energetic ions
Scopus关键词: Acceleration
; Anisotropy
; Protons
; Cluster spacecraft
; Energetic ion
; Energetic ion acceleration
; Energy spectra
; Ion accelerations
; Ion anisotropy
; Near-Earth magnetotail
; Statistical correlation
; Ions
; acceleration
; anisotropy
; correlation
; magnetotail
; statistical analysis
英文摘要: Until now it is still questionable whether ions are accelerated to energies above 100keV in the near-Earth current sheet (CS), in the vicinity of a possible near-Earth neutral line. By using 11years of 3-D energetic ion flux data for protons, helium, and oxygen (~150keV-1MeV) from the RAPID instrument on board Cluster 4, we statistically study the energetic ion acceleration by investigating ion anisotropies in the near-Earth magnetotail (-20 R E150keV) ions (protons, He +, and O+) tend to become higher as the earthward (tailward) plasma bulk flows (measured by Cluster Ion Spectrometry experiment) become stronger. During such periods the presence of a strong acceleration source tailward (earthward) of Cluster spacecraft (S/C) is confirmed by the hardening energy spectra of the earthward (tailward) energetic ion flows. A good statistical correlation between tailward bulk flow, negative Bz, and the tailward anisotropy of energetic ions indicates that the strong ion acceleration might be related to a near-Earth reconnection, which occurred earthward of the Cluster S/C. The energetic ion anisotropies do not show a clear dependence on the AE index, which may indicate that the acceleration source(s) for the energetic ions could be spatially localized. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84901889808&doi=10.1002%2f2014GL060252&partnerID=40&md5=6bd001c92413be2a4bb38a552210a36d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7803
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Ionospheric Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Luo H.,Kronberg E.A.,Grigorenko E.E.,et al. Evidence of strong energetic ion acceleration in the near-Earth magnetotail[J]. Geophysical Research Letters,2014-01-01,41(11).