DOI: 10.1002/2017JA024867
Scopus记录号: 2-s2.0-85040960843
论文题名: Fast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanism
作者: Min K. ; Liu K. ; Wang X. ; Chen L. ; Denton R.E.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 497
结束页码: 512
语种: 英语
英文关键词: fast magnetosonic waves
; inner magnetosphere
; observation-simulation comparison
; wave excitation
英文摘要: Linear Vlasov theory and particle-in-cell (PIC) simulations for electromagnetic fluctuations in a homogeneous, magnetized, and collisionless plasma are used to investigate a fast magnetosonic wave event observed by the Van Allen Probes. The fluctuating magnetic field observed exhibits a series of spectral peaks at harmonics of the proton cyclotron frequency Ωp and has a dominant compressional component, which can be classified as fast magnetosonic waves. Furthermore, the simultaneously observed proton phase space density exhibits positive slopes in the perpendicular velocity space, ∂fp/∂v⊥>0, which can be a source for these waves. Linear theory analyses and PIC simulations use plasma and field parameters measured in situ except that the modeled proton distribution is modified to have larger ∂fp/∂v⊥ under the assumption that the observed distribution corresponds to a marginally stable state when the distribution has already been scattered by the excited waves. The results show that the positive slope is the source of the proton cyclotron harmonic waves at propagation quasi-perpendicular to the background magnetic field, and as a result of interactions with the excited waves the evolving proton distribution progresses approximately toward the observed distribution. ©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/114724
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; Department of Physics, Auburn University, Auburn, AL, United States; Department of Physics, University of Texas at Dallas, Richardson, TX, United States; Department of Physics and Astronomy, Dartmouth College, Hanover, NH, United States
Recommended Citation:
Min K.,Liu K.,Wang X.,et al. Fast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanism[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)