DOI: 10.1002/2015GL064781
论文题名: Time-dispersed ion signatures observed in the Martian magnetosphere by MAVEN
作者: Halekas J.S. ; McFadden J.P. ; Connerney J.E.P. ; Espley J.R. ; Brain D.A. ; Mitchell D.L. ; Larson D.E. ; Harada Y. ; Hara T. ; Ruhunusiri S. ; Jakosky B.M.
刊名: Geophysical Research Letters
ISSN: 0094-8478
EISSN: 1944-8209
出版年: 2015
卷: 42, 期: 21 起始页码: 8910
结束页码: 8916
语种: 英语
英文关键词: ion acceleration
; Mars
; MAVEN
; pickup
; waves
Scopus关键词: Electric fields
; Ions
; Magnetosphere
; Pickups
; Waves
; Ion accelerations
; Low-frequency plasmas
; Magnetospheric boundary
; Magnetospheric tail
; Mars
; MAVEN
; Potential mechanism
; Volatile evolution
; Dispersion (waves)
; atmospheric wave
; dispersion
; electric field
; energy dissipation
; instrumentation
; ion exchange
; magnetosphere
; magnetotail
; Martian atmosphere
; periodicity
; plasma
; spectrum
英文摘要: Mars Atmosphere and Volatile EvolutioN mission's (MAVEN) high-cadence measurements reveal the frequent occurrence of ion energy dispersion events inside the Martian magnetosphere. The systematics of observed dispersion signatures suggest time dispersion of a broad source spectrum over a flight distance of a few thousand kilometers and disfavor mechanisms involving spatial dispersion. Pickup of heavy planetary ions in strong variable electric fields provides one potential mechanism that could produce the observed time dispersion signatures. The periodicity of many observed dispersion signatures, with frequencies near the upstream proton cyclotron frequency, suggests a possible role for low-frequency plasma waves in accelerating the observed ions from a source near the induced magnetospheric boundary to the observation location inside the magnetospheric tail lobes. The observed dispersion signatures may provide a new way to track the flow of energy from the upstream region through the magnetosphere and the role of waves in driving the escape of ions from the atmosphere. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955189440&doi=10.1002%2f2015GL064781&partnerID=40&md5=e120c8e1e649f379ee255e43798ab99d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8094
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 Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Recommended Citation:
Halekas J.S.,McFadden J.P.,Connerney J.E.P.,et al. Time-dispersed ion signatures observed in the Martian magnetosphere by MAVEN[J]. Geophysical Research Letters,2015-01-01,42(21).