气候变化领域集成服务门户(CCPortal): Characteristics of Energetic Electrons Near Active Magnetotail Reconnection Sites: Tracers of a Complex Magnetic Topology and Evidence of Localized Acceleration

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DOI	10.1029/2020GL090089
	Characteristics of Energetic Electrons Near Active Magnetotail Reconnection Sites: Tracers of a Complex Magnetic Topology and Evidence of Localized Acceleration
	Turner D.L.; Cohen I.J.; Bingham S.T.; Stephens G.K.; Sitnov M.I.; Mauk B.H.; Denton R.E.; Leonard T.W.; Fennell J.F.; Blake J.B.; Torbert R.B.; Burch J.L.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	We present detailed observations and reconstructed magnetic field topologies from a magnetic reconnection event observed directly by NASA's Magnetospheric Multiscale (MMS) mission. Comparing and contrasting energy and angular distributions of >50 keV electrons observed by three MMS spacecraft separated by only ∼18 km revealed a combination of chaotic motion and surprisingly coherent gyrophase bunching within a few thousand kilometers of the reconnection site. Such gyrophase-bunched electrons have not been observed previously at these energies in relation to magnetic reconnection. Results indicate that the magnetic topology around the electron diffusion region was relatively stable over several seconds (i.e., more than a thousand electron gyro-periods), and the observed gyrophase bunching may be the highest-energy extent of coherent gyrophase structures observed at lower-energies closer to the reconnection site. We hypothesize that the coherent gyrophase bunching was evidence of these energetic electrons being accelerated at the reconnection site and possibly also in the outflowing exhaust jets of the active reconnection. This case study exemplifies how energetic electrons can carry coherent signals of remote magnetic topologies and processes relevant to the physics of magnetic reconnection. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electron scattering; Magnetism; Magnetosphere; NASA; Space flight; Topology; Tracers; Electron diffusion; Energetic electron; Magnetic field topology; Magnetic reconnections; Magnetic topologies; Magnetospheric multiscale missions; Magnetotail reconnection; Reconnection sites; Electrons
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/169193
作者单位	Space Exploration Sector, The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Department of Physics and Astronomy, Dartmouth College, Hanover, NH, United States; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States; Department of Space Sciences, The Aerospace Corporation, El Segundo, CA, United States; Department of Physics and Astronomy, University of New Hampshire, Durham, NH, United States; Southwest Research Institute, San Antonio, TX, United States
推荐引用方式 GB/T 7714	Turner D.L.,Cohen I.J.,Bingham S.T.,et al. Characteristics of Energetic Electrons Near Active Magnetotail Reconnection Sites: Tracers of a Complex Magnetic Topology and Evidence of Localized Acceleration[J],2021,48(2).
APA	Turner D.L..,Cohen I.J..,Bingham S.T..,Stephens G.K..,Sitnov M.I..,...&Burch J.L..(2021).Characteristics of Energetic Electrons Near Active Magnetotail Reconnection Sites: Tracers of a Complex Magnetic Topology and Evidence of Localized Acceleration.Geophysical Research Letters,48(2).
MLA	Turner D.L.,et al."Characteristics of Energetic Electrons Near Active Magnetotail Reconnection Sites: Tracers of a Complex Magnetic Topology and Evidence of Localized Acceleration".Geophysical Research Letters 48.2(2021).