globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA025139
Scopus记录号: 2-s2.0-85050273839
论文题名:
Van Allen Probes Observation of a Fundamental Poloidal Standing Alfvén Wave Event Related to Giant Pulsations
作者: Takahashi K.; Claudepierre S.G.; Rankin R.; Mann I.R.; Smith C.W.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:6
起始页码: 4574
结束页码: 4593
语种: 英语
英文关键词: drift resonance ; fundamental standing Alfvén wave ; giant pulsation ; proton flux oscillation
英文摘要: The Van Allen Probes-A spacecraft observed an ∼9-mHz ultralow-frequency wave on 6 October 2012, at L ∼ 5.7, in the dawn sector, and very near the magnetic equator. The wave had a strong electric field that was initially stronger in the azimuthal component and later in the radial component, exhibited properties of a fundamental standing Alfvén wave, and was associated with giant pulsations observed on the ground near the magnetic field footprint of the spacecraft. The wave was accompanied by oscillations of the flux of energetic protons (jH+). The amplitude of logjH+ oscillations was large at equatorial pitch angles away from 90°, and the energy dependence of the phase and amplitude of the oscillations exhibited features consistent with drift resonance of ∼140-keV protons with a westward-propagating wave having an azimuthal wave number of ∼−40. The wave was detected when the spacecraft entered a region of an earthward gradient of the proton phase space density, in support of a theoretical prediction that such a gradient can drive fundamental poloidal waves. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113804
Appears in Collections:气候减缓与适应

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作者单位: The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Space Sciences Department, The Aerospace Corporation, Los Angeles, CA, United States; Department of Physics, University of Alberta, Edmonton, AB, Canada; Department of Physics and Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States

Recommended Citation:
Takahashi K.,Claudepierre S.G.,Rankin R.,et al. Van Allen Probes Observation of a Fundamental Poloidal Standing Alfvén Wave Event Related to Giant Pulsations[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)
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