DOI: 10.1029/2018JA025208
Scopus记录号: 2-s2.0-85047615149
论文题名: MAVEN Observations of Solar Wind-Driven Magnetosonic Waves Heating the Martian Dayside Ionosphere
作者: Fowler C.M. ; Andersson L. ; Ergun R.E. ; Harada Y. ; Hara T. ; Collinson G. ; Peterson W.K. ; Espley J. ; Halekas J. ; Mcfadden J. ; Mitchell D.L. ; Mazelle C. ; Benna M. ; Jakosky B.M.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 4129
结束页码: 4149
语种: 英语
英文关键词: ion heating
; ionosphere
; magnetosonic waves
; Mars
; solar wind interaction
英文摘要: We present Mars Atmosphere and Volatile EvolutioN observations of large-amplitude magnetosonic waves propagating through the magnetosheath into the Martian ionosphere near the subsolar point on the dayside of the planet. The observed waves grow in amplitude as predicted for a wave propagating into a denser, charged medium, with wave amplitudes reaching 25 nT, equivalent to ∼40% of the background field strength. These waves drive significant density and temperature variations (∼20% to 100% in amplitude) in the suprathermal electrons and light ion species (H+) that correlate with compressional fronts of the magnetosonic waves. Density and temperature variations are also observed for the ionospheric electrons, and heavy ion species (O+ and O+ 2); however, these variations are not in phase with the magnetic field variations. Whistler waves are observed at compressional wave fronts and are thought to be produced by unstable, anistropic suprathermal electrons. The magnetosonic waves drive significant ion and electron heating down to just above the exobase region. Ion heating rates are estimated to be between 0.03 and 0.2 eVs−1 per ion, and heavier ions could thus gain escape energy if located in this heating region for ∼10–70 s. The measured ionospheric density profile indicates severe ionospheric erosion above the exobase region, and this is likely caused by substantial ion outflow that is driven by the observed heating. The effectiveness of these magnetosonic waves to energize the plasma close to the exobase could have important implications for the long-term climate evolution for unmagnetized bodies that are exposed to the solar wind. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113982
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Laboratory of Atmospheric and Space Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Physics And Astronomy, University Of Iowa, Iowa City, IA, United States; Space Sciences Laboratory, University of California, Berkeley, CA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; IRAP, University of Toulouse, CNRS, UPS, CNES, Toulouse, France
Recommended Citation:
Fowler C.M.,Andersson L.,Ergun R.E.,et al. MAVEN Observations of Solar Wind-Driven Magnetosonic Waves Heating the Martian Dayside Ionosphere[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)