DOI: 10.1029/2018JA025184
Scopus记录号: 2-s2.0-85047620211
论文题名: Traveling Ultralow-Frequency Waves and Their Influences Over Low-Energy, Charged Particles
作者: Yang M. ; Zhou X.-Z. ; Zong Q.-G. ; Zhang L.-F. ; Rankin R. ; Wang Y.-F.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 3848
结束页码: 3858
语种: 英语
英文关键词: particle acceleration
; plasmaspheric electrons
; surfatron-type acceleration
; traveling waves
; ULF waves
; wave-particle interactions
英文摘要: In Earth's magnetosphere, the behavior of charged particles in response to ultralow-frequency (ULF) waves has long been understood in the framework of their resonant interactions with standing hydromagnetic waves. It has been argued that for impulse-excited waves, it may take a few wave cycles for the standing structure to be fully established; during these initial cycles, the waves should propagate along magnetic field lines before they are reflected from the ionosphere and are superimposed to form standing waves. However, it has been unclear how particles behave during the initial, traveling stage of the ULF wave evolution. Here we use a simplistic model of ULF wave evolution from traveling to standing waves, to investigate the response of low-energy electrons (presumably of plasmaspheric and/or ionospheric origin) immediately after the wave excitation. We find that an off-equatorial spacecraft would observe dispersive signatures in both energy and pitch angle spectra of electron fluxes, and the flux modulation may appear (at specific pitch angle and energy ranges) prior to the electromagnetic oscillations. These predicted signatures, consistent with the scenario of field-aligned streaming electrons surfing on traveling ULF waves, are indeed observed by the Cluster spacecraft during an ULF wave event on 25 September 2001. Our identification of such signatures, therefore, provides a new understanding of ULF wave evolution and wave-particle interactions in the inner magnetosphere. ©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/114020
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Institute of Space Physics and Applied Technology, Peking University, Beijing, China; Department of Physics, University of Alberta, Edmonton, AB, Canada
Recommended Citation:
Yang M.,Zhou X.-Z.,Zong Q.-G.,et al. Traveling Ultralow-Frequency Waves and Their Influences Over Low-Energy, Charged Particles[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)