DOI: 10.1002/2017JA024874
Scopus记录号: 2-s2.0-85041174465
论文题名: Control of ULF Wave Accessibility to the Inner Magnetosphere by the Convection of Plasma Density
作者: Degeling A.W. ; Rae I.J. ; Watt C.E.J. ; Shi Q.Q. ; Rankin R. ; Zong Q.-G.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 2 起始页码: 1086
结束页码: 1099
语种: 英语
英文关键词: convection
; inner magnetosphere
; plasmaspheric drainage plume
; radiation belts
; ULF waves
英文摘要: During periods of storm activity and enhanced convection, the plasma density in the afternoon sector of the magnetosphere is highly dynamic due to the development of plasmaspheric drainage plume (PDP) structure. This significantly affects the local Alfvén speed and alters the propagation of ULF waves launched from the magnetopause. Therefore, it can be expected that the accessibility of ULF wave power for radiation belt energization is sensitively dependent on the recent history of magnetospheric convection and the stage of development of the PDP. This is investigated using a 3-D model for ULF waves within the magnetosphere in which the plasma density distribution is evolved using an advection model for cold plasma, driven by a (VollandStern) convection electrostatic field (resulting in PDP structure). The wave model includes magnetic field day/night asymmetry and extends to a paraboloid dayside magnetopause, from which ULF waves are launched at various stages during the PDP development. We find that the plume structure significantly alters the field line resonance location, and the turning point for MHD fast waves, introducing strong asymmetry in the ULF wave distribution across the noon meridian. Moreover, the density enhancement within the PDP creates a waveguide or local cavity for MHD fast waves, such that eigenmodes formed allow the penetration of ULF wave power to much lower L within the plume than outside, providing an avenue for electron energization. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114561
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Space Science, Shandong University, Weihai, China; Department of Space and Climate Physics, University College London, London, United Kingdom; Department of Meteorology, University of Reading, Reading, United Kingdom; Department of Physics, University of Alberta, Edmonton, AB, Canada; Institute of Space Physics and Applied Technology, Peking University, Beijing, China
Recommended Citation:
Degeling A.W.,Rae I.J.,Watt C.E.J.,et al. Control of ULF Wave Accessibility to the Inner Magnetosphere by the Convection of Plasma Density[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)