globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024674
Scopus记录号: 2-s2.0-85043702209
论文题名:
The Role of Localized Compressional Ultra-low Frequency Waves in Energetic Electron Precipitation
作者: Rae I.J.; Murphy K.R.; Watt C.E.J.; Halford A.J.; Mann I.R.; Ozeke L.G.; Sibeck D.G.; Clilverd M.A.; Rodger C.J.; Degeling A.W.; Forsyth C.; Singer H.J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:3
起始页码: 1900
结束页码: 1914
语种: 英语
英文关键词: adiabatic invariants ; drift trajectory ; energetic particle precipitation ; riometer ; ULF waves
英文摘要: Typically, ultra-low frequency (ULF) waves have historically been invoked for radial diffusive transport leading to acceleration and loss of outer radiation belt electrons. At higher frequencies, very low frequency waves are generally thought to provide a mechanism for localized acceleration and loss through precipitation into the ionosphere of radiation belt electrons. In this study we present a new mechanism for electron loss through precipitation into the ionosphere due to a direct modulation of the loss cone via localized compressional ULF waves. We present a case study of compressional wave activity in tandem with riometer and balloon-borne electron precipitation across keV-MeV energies to demonstrate that the experimental measurements can be explained by our new enhanced loss cone mechanism. Observational evidence is presented demonstrating that modulation of the equatorial loss cone can occur via localized compressional wave activity, which greatly exceeds the change in pitch angle through conservation of the first and second adiabatic invariants. The precipitation response can be a complex interplay between electron energy, the localization of the waves, the shape of the phase space density profile at low pitch angles, ionospheric decay time scales, and the time dependence of the electron source; we show that two pivotal components not usually considered are localized ULF wave fields and ionospheric decay time scales. We conclude that enhanced precipitation driven by compressional ULF wave modulation of the loss cone is a viable candidate for direct precipitation of radiation belt electrons without any additional requirement for gyroresonant wave-particle interaction. Additional mechanisms would be complementary and additive in providing means to precipitate electrons from the radiation belts during storm times. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114380
Appears in Collections:气候减缓与适应

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作者单位: Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Dorking, United Kingdom; NASA Goddard Space Flight Centre, Greenbelt, MD, United States; Department of Meteorology, University of Reading, Reading, United Kingdom; Space Sciences Department, The Aerospace Corporation, Chantilly, VA, United States; Department of Physics, University of Alberta, Edmonton, AB, Canada; British Antarctic Survey (NERC), Cambridge, United Kingdom; Department of Physics, University of Otago, Dunedin, New Zealand; Institute of Space Science and Physics, Shandong University, Weihai, China; Space Weather Prediction Center, NOAA, Boulder, CO, United States

Recommended Citation:
Rae I.J.,Murphy K.R.,Watt C.E.J.,et al. The Role of Localized Compressional Ultra-low Frequency Waves in Energetic Electron Precipitation[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)
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