globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024517
Scopus ID: 2-s2.0-85045517221
Title:
Magnetospheric Multiscale Observations of an Ion Diffusion Region With Large Guide Field at the Magnetopause: Current System, Electron Heating, and Plasma Waves
Author: Zhou M.; Berchem J.; Walker R.J.; El-Alaoui M.; Goldstein M.L.; Lapenta G.; Deng X.; Li J.; Le Contel O.; Graham D.B.; Lavraud B.; Paterson W.R.; Giles B.L.; Burch J.L.; Torbert R.B.; Russell C.T.; Strangeway R.J.; Zhao C.; Ergun R.E.; Lindqvist P.-A.; Marklund G.
Source Publication: Journal of Geophysical Research: Space Physics
ISSN: 21699380
Publishing Year: 2018
Volume: 123, Issue:3
pages begin: 1834
pages end: 1852
Language: 英语
Keyword: dayside magnetopause ; guide field ; ion diffusion region ; magnetic reconnection ; plasma waves
English Abstract: We report Magnetospheric Multiscale (MMS) observations of a reconnecting current sheet in the presence of a weak density asymmetry with large guide field at the dayside magnetopause. An ion diffusion region (IDR) was detected associated with this current sheet. Parallel current dominated over the perpendicular current in the IDR, as found in previous studies of component reconnection. Electrons were preferentially heated parallel to the magnetic field within the IDR. The heating was manifested as a flattop distribution below 400 eV. Two types of electromagnetic electron whistler waves were observed within the regions where electrons were heated. One type of whistler wave was associated with nonlinear structures in E|| with amplitudes up to 20 mV/m. The other type was not associated with any structures in E||. Poynting fluxes of these two types of whistler waves were directed away from the X-line. We suggest that the nonlinear evolution of the oblique whistler waves gave rise to the solitary structures in E||. There was a perpendicular super-Alfvénic outflow jet that was carried by magnetized electrons. Intense electrostatic lower hybrid drift waves were localized in the current sheet center and were probably driven by the super-Alfvénic electron jet, the velocity of which was approximately equal to the diamagnetic drift of demagnetized ions. Our observations suggest that the guide field significantly modified the structures (Hall electromagnetic fields and current system) and wave properties in the IDR. ©2018. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:16   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/114311
Appears in Collections:气候减缓与适应

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Affiliation: Department of Physics and Astronomy, University of California, Los Angeles, CA, United States; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Space Science Institute, Boulder, CO, United States; Centre for Plasma Astrophysics, Department of Mathematics, Katholieke Universiteit, Leuven, Belgium; Institute of Space Science and Technology, Nanchang University, Nanchang, China; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Laboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, UPMC Universite Paris 06, Universite Paris-Sud, Observatoire de Paris, Paris, France; Swedish Institute of Space Physics, Uppsala, Sweden; Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, UPS, CNES, Toulouse, France; Southwest Research Institute, San Antonio, TX, United States; Department of Physics and Space Science Center, University of New Hampshire, Durham, NH, United States; LASP, University of Colorado Boulder, Boulder, CO, United States; Department of Space and Plasma Physics, Royal Institute of Technology, Stockholm, Sweden

Recommended Citation:
Zhou M.,Berchem J.,Walker R.J.,et al. Magnetospheric Multiscale Observations of an Ion Diffusion Region With Large Guide Field at the Magnetopause: Current System, Electron Heating, and Plasma Waves[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)
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