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DOI | 10.1029/2019GL085562 |
Parallel Acceleration of Suprathermal Electrons Caused by Whistler-Mode Hiss Waves | |
Li, Jinxing1; Ma, Qianli1,2; Bortnik, Jacob1; Li, Wen2; An, Xin1; Reeves, Geoffrey D.3; Funsten, Herbert O.4; Spence, Harlan5; Baker, Daniel N.6; Kurth, William S.7; Hospodarsky, George B.7; Hartley, Dave P.7 | |
2019-11-22 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:22页码:12675-12684 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Suprathermal electrons (similar to 0.1-10 keV) in the inner magnetosphere are usually observed in a 90 degrees-peaked pitch angle distribution, formed due to the conservation of the first and second adiabatic invariants as they are transported from the plasma sheet. We report a peculiar field-aligned suprathermal electron (FASE) distribution measured by Van Allen Probes, where parallel fluxes are 1 order of magnitude higher than perpendicular fluxes. Those FASEs are found to be closely correlated with large-amplitude hiss waves and are observed around the Landau resonant energies. We demonstrate, using quasilinear diffusion simulations, that hiss waves can rapidly accelerate suprathermal electrons through Landau resonance and create the observed FASE population. The proposed mechanism potentially has broad implications for suprathermal electron dynamics as well as whistler mode waves in the Earth's magnetosphere and has been demonstrated in the Jovian magnetosphere. Plain Language Summary Hiss waves are structureless and incoherent "hissy" emissions found in the magnetized near-Earth space, typically in a frequency range from 0.1 to 2 kHz. Hiss waves have traditionally been treated as an energetic electron removal mechanism, because they can precipitate energetic electrons through resonant interactions and cause electron loss into the atmosphere. Here we show, by presenting observations from NASA's Van Allen Probes, that intense hiss waves are accompanied by enhancements of field-aligned suprathermal electrons. We propose that hiss waves can accelerate suprathermal electrons as they travel at the same speed in the direction along the magnetic field. Computer simulations successfully reproduce the rapid enhancement of field-aligned suprathermal electrons under the impact of hiss waves, with detailed features similar to observations. |
英文关键词 | particle acceleration hiss waves whistler mode waves wave-particle interaction Landau resonance quasilinear diffusion |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000497910600001 |
WOS关键词 | PLASMASPHERIC HISS ; STATISTICAL PROPERTIES ; RESONANT SCATTERING ; CHORUS WAVES ; THEMIS ; DEPENDENCE ; EVOLUTION ; PARTICLE ; REGIONS ; ORIGIN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/225073 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90024 USA; 2.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 3.Los Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USA; 4.Los Alamos Natl Lab, Los Alamos, NM USA; 5.Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA; 6.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 7.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA |
推荐引用方式 GB/T 7714 | Li, Jinxing,Ma, Qianli,Bortnik, Jacob,et al. Parallel Acceleration of Suprathermal Electrons Caused by Whistler-Mode Hiss Waves[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(22):12675-12684. |
APA | Li, Jinxing.,Ma, Qianli.,Bortnik, Jacob.,Li, Wen.,An, Xin.,...&Hartley, Dave P..(2019).Parallel Acceleration of Suprathermal Electrons Caused by Whistler-Mode Hiss Waves.GEOPHYSICAL RESEARCH LETTERS,46(22),12675-12684. |
MLA | Li, Jinxing,et al."Parallel Acceleration of Suprathermal Electrons Caused by Whistler-Mode Hiss Waves".GEOPHYSICAL RESEARCH LETTERS 46.22(2019):12675-12684. |
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