DOI: 10.1002/2015GL066592
论文题名: On the dependence of storm time ULF wave power on magnetopause location: Impacts for ULF wave radial diffusion
作者: Murphy K.R. ; Mann I.R. ; Sibeck D.G.
刊名: Geophysical Research Letters
ISSN: 0094-8403
EISSN: 1944-8134
出版年: 2015
卷: 42, 期: 22 起始页码: 9676
结束页码: 9684
语种: 英语
英文关键词: coronal mass ejection
; corotating interaction region
; geomagnetic storms
; magnetopause
; radial diffusion
; ULF waves
Scopus关键词: Diffusion
; Geomagnetism
; Magnetosphere
; Plasma density
; Radiation belts
; Solar wind
; Storms
; Wave power
; Coronal mass ejection
; Corotating interaction regions
; Geomagnetic storm
; Radial diffusion
; ULF waves
; Magnetopause
; amplitude
; coronal mass ejection
; frequency analysis
; geomagnetic storm
; magnetopause
; magnetosphere
; particle motion
; penetration
; plasma
; radial diffusion
; radiative transfer
; solar wind
; statistical analysis
; storm
; wave power
英文摘要: Ultralow frequency (ULF) waves play a crucial role in energetic particle dynamics in the inner magnetosphere. We examine the role of the magnetopause location in controlling the amplitude and penetration of ULF waves within the inner magnetosphere during 63 coronal mass ejection (CME)-driven and corotating interaction region (CIR)-driven geomagnetic storms. Significantly, at the time when the magnetopause is most compressed, ULF wave power increases and penetrates to the deepest L shells. Most likely this is explained by proximity to the energy source and accumulation of energy within a smaller volume through solar wind-magnetopause-magnetosphere coupling, and changes in the storm time Alfvén continuum resulting from variations in the cold plasma density. The observed ULF wave power is consistently larger than Kp-dependent statistical estimates - especially in the heart of the outer radiation belt. This has important implications for radiation belt dynamics, including main phase loss and storm time ULF wave radial diffusion. Key Points The magnetopause location controls ULF wave amplitude and penetration into the inner magnetosphere ULF wave power can be underestimated by 2 orders of magnitude during storm main phase Loss due to outward radial diffusion during storm main phase is faster than typically modeled. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956923983&doi=10.1002%2f2015GL066592&partnerID=40&md5=fc89c36d0d8082f45be503f4ef4d3cda
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8019
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Murphy K.R.,Mann I.R.,Sibeck D.G.. On the dependence of storm time ULF wave power on magnetopause location: Impacts for ULF wave radial diffusion[J]. Geophysical Research Letters,2015-01-01,42(22).