DOI: 10.1002/2014GL061414
论文题名: The trapping of equatorial magnetosonic waves in the Earth's outer plasmasphere
作者: Ma Q. ; Li W. ; Chen L. ; Thorne R.M. ; Kletzing C.A. ; Kurth W.S. ; Hospodarsky G.B. ; Reeves G.D. ; Henderson M.G. ; Spence H.E.
刊名: Geophysical Research Letters
ISSN: 0094-9780
EISSN: 1944-9511
出版年: 2014
卷: 41, 期: 18 起始页码: 6307
结束页码: 6313
语种: 英语
英文关键词: magnetosonic waves
; Van Allen Probes observation
; wave excitation
; wave propagation
Scopus关键词: Probes
; Trapped ions
; Wave propagation
; Inner plasmasphere
; Instability analysis
; Magnetosonic waves
; Ring distributions
; Similar analysis
; Trapping mechanisms
; Van Allen Probes observation
; Wave excitation
; Magnetosphere
; instability
; observational method
; prediction
; wave propagation
英文摘要: We investigate the excitation and propagation of equatorial magnetosonic waves observed by the Van Allen Probes and describe evidence for a trapping mechanism for magnetosonic waves in the Earth's plasmasphere. Intense equatorial magnetosonic waves were observed inside the plasmasphere in association with a pronounced proton ring distribution, which provides free energy for wave excitation. Instability analysis along the inbound orbit demonstrates that broadband magnetosonic waves can be excited over a localized spatial region near the plasmapause. The waves can subsequently propagate into the inner plasmasphere and remain trapped over a limited radial extent, consistent with the predictions of near-perpendicular propagation. By performing a similar analysis on another observed magnetosonic wave event, we demonstrate that magnetosonic waves can also be trapped within local density structures. We suggest that perpendicular wave propagation is important for explaining the presence of magnetosonic waves in the Earth's plasmasphere at locations away from the generation region. Key Points Magnetosonic waves are excited by ion ring distributions near the plasmapauseMagnetosonic waves are trapped in a limited radial region in the plasmasphereMagnetosonic waves are modulated by local density structures ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911191317&doi=10.1002%2f2014GL061414&partnerID=40&md5=d29eaf585dbac6f3c9b15139da895a83
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7044
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States
Recommended Citation:
Ma Q.,Li W.,Chen L.,et al. The trapping of equatorial magnetosonic waves in the Earth's outer plasmasphere[J]. Geophysical Research Letters,2014-01-01,41(18).