气候变化领域集成服务门户(CCPortal): Direct Evidence for Electron Acceleration Within Ion-Scale Flux Rope

CCPortal

DOI	10.1029/2019GL085141
	Direct Evidence for Electron Acceleration Within Ion-Scale Flux Rope
	Zhong Z.H.; Zhou M.; Tang R.X.; Deng X.H.; Turner D.L.; Cohen I.J.; Pang Y.; Man H.Y.; Russell C.T.; Giles B.L.; Paterson W.R.; Khotyaintsev Y.; Burch J.L.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:1
英文摘要	Energetic electrons have frequently been observed in small-scale flux ropes. However, whether these energetic electrons were energized directly within the flux rope or not is unknown. In this paper, we present concrete evidence provided by the Magnetospheric Multiscale mission that a secondary flux rope provided strong acceleration for electrons expelled by the reconnection X line. We find that the energetic electron fluxes inside the ion-scale flux rope were larger than those outside the flux rope. Electrons were adiabatically accelerated by betatron and Fermi mechanisms inside the flux rope. The highest energy electrons (>100 keV) were produced by betatron acceleration, whereas Fermi acceleration was unable to accelerate the electrons to high energy probably due to the finite distance of the acceleration region along the field-aligned direction. These results confirm the essential role of ion-scale flux ropes in producing energetic electrons. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Acceleration; Betatrons; Electron scattering; Fermi level; Ions; Magnetosphere; Rope; Acceleration regions; Electron acceleration; Energetic electron; Fermi acceleration; Fermi mechanism; Finite distance; Flux ropes; Magnetospheric multiscale missions; Electrons; acceleration; adiabatic process; concrete; electron; flux measurement; magnetosphere
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/170889
作者单位	School of Resource Environmental and Chemical Engineering, Nanchang University, Nanchang, China; Institute of Space Science and Technology, Nanchang University, Nanchang, China; Department of Physics, School of Sciences, Nanchang University, Nanchang, China; The Aerospace Corporation, El Segundo, CA, United States; Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD, United States; Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles, CA, United States; NASA, Goddard Space Flight Center, Greenbelt, MA, United States; Swedish Institute of Space Physics, Uppsala, Sweden; Southwest Research Institute, San Antonio, TX, United States
推荐引用方式 GB/T 7714	Zhong Z.H.,Zhou M.,Tang R.X.,et al. Direct Evidence for Electron Acceleration Within Ion-Scale Flux Rope[J],2020,47(1).
APA	Zhong Z.H..,Zhou M..,Tang R.X..,Deng X.H..,Turner D.L..,...&Burch J.L..(2020).Direct Evidence for Electron Acceleration Within Ion-Scale Flux Rope.Geophysical Research Letters,47(1).
MLA	Zhong Z.H.,et al."Direct Evidence for Electron Acceleration Within Ion-Scale Flux Rope".Geophysical Research Letters 47.1(2020).