DOI: 10.1002/2017JA024919
Scopus记录号: 2-s2.0-85042143793
论文题名: Cold Ion Heating by Magnetosonic Waves in a Density Cavity of the Plasmasphere
作者: Yuan Z. ; Yu X. ; Huang S. ; Qiao Z. ; Yao F. ; Funsten H.O.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 2 起始页码: 1242
结束页码: 1250
语种: 英语
英文关键词: cold ion heating
; Density cavities
; local linear growth rates
; Magnetosonic waves
; ring current ions
; ‘ring’ distributions
英文摘要: Fast magnetosonic (MS) waves play an important role in the dynamics of the inner magnetosphere. Theoretical prediction and simulation have demonstrated that MS waves can heat cold ions. However, direct observational evidence of cold ion heating by MS waves has so far remained elusive. In this paper, we show a typical event of cold ion heating by magnetosonic waves in a density cavity of the plasmasphere with observations of the Van Allen Probe mission on 22 August 2013. During enhancements of the MS wave intensity in the density cavity, the fluxes of trapped H+ and He+ ions with energies of 10–100 eV were observed to increase, implying that cold plasmaspheric ions were heated through high-order resonances with the MS waves. Based on simultaneous observations of ring current protons, we have calculated local linear growth rates, which demonstrate that magnetosonic waves can be locally generated in the density cavity. Our results provide a direct observational proof of the energy coupling process between the ring current and plasmasphere; that is, through exciting MS waves, the free energy stored in the ring current protons with ring distributions is released. In the density cavity of the plasmasphere, both cold H+ and He+ ions are heated by MS waves. As a result, the energy of the ring current can be transferred into the plasmasphere. ©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/114559
Appears in Collections: 气候减缓与适应
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作者单位: School of Electronic Information, Wuhan University, Wuhan, China; Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Yuan Z.,Yu X.,Huang S.,et al. Cold Ion Heating by Magnetosonic Waves in a Density Cavity of the Plasmasphere[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)