globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA024877
Scopus记录号: 2-s2.0-85052386451
论文题名:
Determining the Mode, Frequency, and Azimuthal Wave Number of ULF Waves During a HSS and Moderate Geomagnetic Storm
作者: Murphy K.R.; Inglis A.R.; Sibeck D.G.; Rae I.J.; Watt C.E.J.; Silveira M.; Plaschke F.; Claudepierre S.G.; Nakamura R.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:8
起始页码: 6457
结束页码: 6477
语种: 英语
英文关键词: azimuthal wave number ; geomagnetic storms ; mode structure ; radiation belts ; ULF waves
英文摘要: Ultralow frequency (ULF) waves play a fundamental role in the dynamics of the inner magnetosphere and outer radiation belt during geomagnetic storms. Broadband ULF wave power can transport energetic electrons via radial diffusion, and discrete ULF wave power can energize electrons through a resonant interaction. Using observations from the Magnetospheric Multiscale mission, we characterize the evolution of ULF waves during a high-speed solar wind stream (HSS) and moderate geomagnetic storm while there is an enhancement of the outer radiation belt. The Automated Flare Inference of Oscillations code is used to distinguish discrete ULF wave power from broadband wave power during the HSS. During periods of discrete wave power and utilizing the close separation of the Magnetospheric Multiscale spacecraft, we estimate the toroidal mode ULF azimuthal wave number throughout the geomagnetic storm. We concentrate on the toroidal mode as the HSS compresses the dayside magnetosphere resulting in an asymmetric magnetic field topology where toroidal mode waves can interact with energetic electrons. Analysis of the mode structure and wave numbers demonstrates that the generation of the observed ULF waves is a combination of externally driven waves, via the Kelvin-Helmholtz instability, and internally driven waves, via unstable ion distributions. Further analysis of the periods and toroidal azimuthal wave numbers suggests that these waves can couple with the core electron radiation belt population via the drift resonance during the storm. The azimuthal wave number and structure of ULF wave power (broadband or discrete) have important implications for the inner magnetospheric and radiation belt dynamics. ©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/113411
Appears in Collections:气候减缓与适应

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作者单位: Department of Astronomy, University of Maryland, College Park, MD, United States; Physics Department, Catholic University of America, Washington, DC, United States; NASA Goddard Space Flight Center, Space Weather Laboratory (674), Greenbelt, MD, United States; Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, London, United Kingdom; Department of Meteorology, University of Reading, Reading, United Kingdom; Universities Space Research Association, Columbia, MD, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Space Sciences Department, The Aerospace Corporation, El Segundo, CA, United States

Recommended Citation:
Murphy K.R.,Inglis A.R.,Sibeck D.G.,et al. Determining the Mode, Frequency, and Azimuthal Wave Number of ULF Waves During a HSS and Moderate Geomagnetic Storm[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)
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