globalchange  > 科学计划与规划
DOI: 10.1002/2016GL068359
Currents and associated electron scattering and bouncing near the diffusion region at Earth's magnetopause
Author: Lavraud B.; Zhang Y.C.; Vernisse Y.; Gershman D.J.; Dorelli J.; Cassak P.A.; Dargent J.; Pollock C.; Giles B.; Aunai N.; Argall M.; Avanov L.; Barrie A.; Burch J.; Chandler M.; Chen L.-J.; Clark G.; Cohen I.; Coffey V.; Eastwood J.P.; Egedal J.; Eriksson S.; Ergun R.; Farrugia C.J.; Fuselier S.A.; Génot V.; Graham D.; Grigorenko E.; Hasegawa H.; Jacquey C.; Kacem I.; Khotyaintsev Y.; Macdonald E.; Magnes W.; Marchaudon A.; Mauk B.; Moore T.E.; Mukai T.; Nakamura R.; Paterson W.; Penou E.; Phan T.D.; Rager A.; Retino A.; Rong Z.J.; Russell C.T.; Saito Y.; Sauvaud J.-A.; Schwartz S.J.; Shen C.; Smith S.; Strangeway R.; Toledo-Redondo S.; Torbert R.; Turner D.L.; Wang S.; Yokota S.
Source Publication: Geophysical Research Letters
ISSN: 0094-9125
EISSN: 1944-8856
Publishing Year: 2016
Volume: 43, Issue:7
pages begin: 3042
pages end: 3050
Language: 英语
Keyword: acceleration ; electrons ; Hall fields ; magnetic reconnection ; scattering
Scopus Keyword: Acceleration ; Diffusion ; Electron energy levels ; Electron scattering ; Magnetic fields ; Magnetic mirrors ; Magnetism ; Magnetopause ; Magnetosphere ; NASA ; Scattering ; Electrostatic potentials ; Hall field ; High-resolution measurements ; Magnetic curvature ; Magnetic reconnections ; Magnetospheric multiscale missions ; Pitch angle distribution ; Scattered electrons ; Electrons
English Abstract: Based on high-resolution measurements from NASA's Magnetospheric Multiscale mission, we present the dynamics of electrons associated with current systems observed near the diffusion region of magnetic reconnection at Earth's magnetopause. Using pitch angle distributions (PAD) and magnetic curvature analysis, we demonstrate the occurrence of electron scattering in the curved magnetic field of the diffusion region down to energies of 20 eV. We show that scattering occurs closer to the current sheet as the electron energy decreases. The scattering of inflowing electrons, associated with field-aligned electrostatic potentials and Hall currents, produces a new population of scattered electrons with broader PAD which bounce back and forth in the exhaust. Except at the center of the diffusion region the two populations are collocated and appear to behave adiabatically: the inflowing electron PAD focuses inward (toward lower magnetic field), while the bouncing population PAD gradually peaks at 90° away from the center (where it mirrors owing to higher magnetic field and probable field-aligned potentials). © 2016. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
Appears in Collections:科学计划与规划

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Affiliation: Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, Toulouse, France

Recommended Citation:
Lavraud B.,Zhang Y.C.,Vernisse Y.,et al. Currents and associated electron scattering and bouncing near the diffusion region at Earth's magnetopause[J]. Geophysical Research Letters,2016-01-01,43(7).
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