DOI: 10.1002/2015GL065452
论文题名: MESSENGER observations of Alfvénic and compressional waves during Mercury's substorms
作者: Sun W.-J. ; Slavin J.A. ; Fu S. ; Raines J.M. ; Sundberg T. ; Zong Q.-G. ; Jia X. ; Shi Q. ; Shen X. ; Poh G. ; Pu Z. ; Zurbuchen T.H.
刊名: Geophysical Research Letters
ISSN: 0094-8611
EISSN: 1944-8342
出版年: 2015
卷: 42, 期: 15 起始页码: 6189
结束页码: 6198
语种: 英语
英文关键词: Alfvén wave
; compressional wave
; Mercury substorm
; Pi2 pulsation
Scopus关键词: Electromagnetic waves
; Magnetic fields
; Magnetoplasma
; Mercury (metal)
; Plasma sheaths
; Circularly polarized electromagnetic waves
; Compressional waves
; Field aligned currents
; Low-frequency plasmas
; N-waves
; Pi2 pulsation
; Substorm expansion
; Substorms
; Electromagnetic wave polarization
; electromagnetic wave
; magnetic field
; magnetotail
; Mercury (planet)
; observational method
; plasma
; storm
英文摘要: MErcury Surface, Space ENviroment, GEochemistry, and Ranging (MESSENGER) magnetic field measurements during the substorm expansion phase in Mercury's magnetotail have been examined for evidence of low-frequency plasma waves, e.g., Pi2-like pulsations. It has been revealed that the By fluctuations accompanying substorm dipolarizations are consistent with pulses of field-aligned currents near the high-latitude edge of the plasma sheet. Detailed analysis of the By fluctuations reveals that they are near circularly polarized electromagnetic waves, most likely Alfvén waves. Soon afterward the plasma sheet thickened and MESSENGER detected a series of compressional waves. These Alfvénic and compressional waves have similar durations (10-20 s), suggesting that they may arise from the same source. Drawing on Pi2 pulsation models developed for Earth, we suggest that the Alfvénic and compressional waves reported here at Mercury may be generated by the quasi-periodic sunward flow bursts in Mercury's plasma sheet. But because they are observed during the period with rapid magnetic field reconfiguration, we cannot fully exclude the possibility of standing Alfvén wave. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940449593&doi=10.1002%2f2015GL065452&partnerID=40&md5=e02c03d449fd0a4e7aadc71a6bd132df
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8227
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: School of Earth and Space Sciences, Peking University, Beijing, China
Recommended Citation:
Sun W.-J.,Slavin J.A.,Fu S.,et al. MESSENGER observations of Alfvénic and compressional waves during Mercury's substorms[J]. Geophysical Research Letters,2015-01-01,42(15).