DOI: 10.1002/grl.50635
论文题名: Direct auroral precipitation from the magnetotail during substorms
作者: Ashour-Abdalla M. ; Schriver D. ; Alaoui M.E. ; Richard R. ; Walker R. ; Goldstein M.L. ; Donovan E. ; Zhou M.
刊名: Geophysical Research Letters
ISSN: 0094-8693
EISSN: 1944-8424
出版年: 2013
卷: 40, 期: 15 起始页码: 3787
结束页码: 3792
语种: 英语
英文关键词: Acceleration
; Auroral
; Dipolarization
; magnetotail
; substorm
Scopus关键词: Auroral
; Dipolarization
; Electron precipitation
; Fermi acceleration
; Geomagnetic fields
; Magnetotails
; Pitch-angle scattering
; Substorms
; Acceleration
; Geomagnetism
; Magnetosphere
; Electrons
; aurora
; data acquisition
; geomagnetic field
; latitude
; magnetotail
; simulation
; storm
英文摘要: In this study, we examine the causes of electron precipitation during a substorm on 15 February 2008 that lead to auroral brightening. We use global kinetic simulations along with spacecraft and ground-based data. We find ∼keV electrons in the region modeled in the simulation precipitate into the premidnight sector at latitudes between 71° and 75° due to two distinct physical processes: (1) higher latitude precipitation due to electrons that undergo relatively rapid non-adiabatic pitch angle scattering into the loss cone just earthward of a reconnection region, and (2) lower latitude precipitation due to electrons that are more gradually accelerated primarily parallel to the geomagnetic field by Fermi acceleration. These latter electrons enter the loss cone much closer to Earth at ∼-15 to -10 RE. The electron precipitation due to the combination of these two mechanisms coincides spatially with observed auroral brightening during the disturbed event. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880878380&doi=10.1002%2fgrl.50635&partnerID=40&md5=352083707bf0245131209f4d7f863a6c
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5957
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Institute of Geophysics and Planetary Physics, UCLA, 3860 Slichter Hall, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
Recommended Citation:
Ashour-Abdalla M.,Schriver D.,Alaoui M.E.,et al. Direct auroral precipitation from the magnetotail during substorms[J]. Geophysical Research Letters,2013-01-01,40(15).