DOI: 10.1002/2016GL069008
论文题名: Driving ionospheric outflows and magnetospheric O+ energy density with Alfvén waves
作者: Chaston C.C. ; Bonnell J.W. ; Reeves G.D. ; Skoug R.M.
刊名: Geophysical Research Letters
ISSN: 0094-9621
EISSN: 1944-9352
出版年: 2016
卷: 43, 期: 10 起始页码: 4825
结束页码: 4833
语种: 英语
英文关键词: Alfvén waves
; ion acceleration
; ionosphere
; ionospheric outflow
; ring current
Scopus关键词: Dispersion (waves)
; Geomagnetism
; Ionosphere
; Ionospheric measurement
; Magnetosphere
; Stochastic systems
; Storms
; Trapped ions
; Equatorial planes
; Inner magnetosphere
; Ion accelerations
; Ion energy density
; Ionospheric outflow
; N-waves
; Ring currents
; Top-side ionosphere
; Ions
; acceleration
; electromagnetic wave
; equatorial dynamics
; geomagnetic storm
; ion
; ionosphere
; magnetosphere
; outflow
; oxygen
英文摘要: We show how dispersive Alfvén waves observed in the inner magnetosphere during geomagnetic storms can extract O+ ions from the topside ionosphere and accelerate these ions to energies exceeding 50 keV in the equatorial plane. This occurs through wave trapping, a variant of “shock” surfing, and stochastic ion acceleration. These processes in combination with the mirror force drive field-aligned beams of outflowing ionospheric ions into the equatorial plane that evolve to provide energetic O+ distributions trapped near the equator. These waves also accelerate preexisting/injected ion populations on the same field lines. We show that the action of dispersive Alfvén waves over several minutes may drive order of magnitude increases in O+ ion pressure to make substantial contributions to magnetospheric ion energy density. These wave accelerated ions will enhance the ring current and play a role in the storm time evolution of the magnetosphere. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84971222191&doi=10.1002%2f2016GL069008&partnerID=40&md5=f78981f34b507abcf3f69a00f1d99bb3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10584
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 Sciences Laboratory, University of California, Berkeley, CA, United States
Recommended Citation:
Chaston C.C.,Bonnell J.W.,Reeves G.D.,et al. Driving ionospheric outflows and magnetospheric O+ energy density with Alfvén waves[J]. Geophysical Research Letters,2016-01-01,43(10).