气候变化领域集成服务门户(CCPortal): Filamentary Currents and Alfvénic Vortices in the Inner Magnetosphere

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DOI	10.1029/2019GL086318
	Filamentary Currents and Alfvénic Vortices in the Inner Magnetosphere
	Chaston C.C.; Bonnell J.W.; Wygant J.R.; Reeves G.D.; Baker D.N.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	We show that broadband low-frequency Alfvénic field variations observed in the inner-magnetosphere from the Van Allen Probes during geomagnetically disturbed intervals are composed of multiscale current sheets, current filaments, flow shears, and vortices. These observations pertain to spacecraft frame frequencies (fsc) over the range 0.1 < fsc < 10 Hz and correspond to structure advected over the spacecraft on scales (λ) over the range 0.1 ≲ λ/ρi ≲ 10. where ρi is the average ion gyroradius. The topology of the current and flow is derived via time domain and spectral approaches adapted for the interpretation of advected structure. The results reveal the action of magnetic and convective nonlinearities in the generation of broadband Alfvénic fluctuations prevalent in the inner magnetosphere during active times. The observed current filamentation and rotational vorticity is suggestive of how broadband Alfvénic field variations on kinetic scales are driven and support geophysically significant particle acceleration in the inner magnetosphere. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Geomagnetism; Probes; Radiation belts; Turbulence; Alfven waves; Convective nonlinearity; Current filamentation; Current filaments; Inner magnetosphere; Particle acceleration; Ring currents; Spacecraft frames; Vortex flow; magnetosphere; probe; spacecraft; vorticity
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170699
作者单位	Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA, United States; Department of Physics and Astronomy, University of Minnesota, Minneapolis, MN, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Chaston C.C.,Bonnell J.W.,Wygant J.R.,et al. Filamentary Currents and Alfvénic Vortices in the Inner Magnetosphere[J],2020,47(4).
APA	Chaston C.C.,Bonnell J.W.,Wygant J.R.,Reeves G.D.,&Baker D.N..(2020).Filamentary Currents and Alfvénic Vortices in the Inner Magnetosphere.Geophysical Research Letters,47(4).
MLA	Chaston C.C.,et al."Filamentary Currents and Alfvénic Vortices in the Inner Magnetosphere".Geophysical Research Letters 47.4(2020).