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Current sheets in comet 67P/Churyumov-Gerasimenko's coma

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Title: Current sheets in comet 67P/Churyumov-Gerasimenko's coma
Authors: Volwerk, M
Jones, GH
Broiles, T
Burch, J
Carr, C
Coates, AJ
Cupido, E
Delva, M
Edberg, NJT
Eriksson, A
Goetz, C
Goldstein, R
Henri, P
Madanian, H
Nilsson, H
Richter, I
Schwingenschuh, K
Wieser, GS
Glassmeier, K-H
Item Type: Journal Article
Abstract: The Rosetta Plasma Consortium (RPC) data are used to investigate the presence of current sheets in the coma of comet 67P/Churyumov-Gerasimenko. The interaction of the interplanetary magnetic field (IMF) transported by the solar wind toward the outgassing comet consists amongst others of mass loading and field line draping near the nucleus. The draped field lines lead to so-called nested draping because of the constantly changing direction of the IMF. It is shown that the draping pattern is strongly variable over the period of one month. Nested draping results in neighbouring regions with oppositely directed magnetic fields, which are separated by current sheets. Selected events on 5 and 6 June 2015 are studied, which show that there are strong rotations of the magnetic field with associated current sheets that have strengths from several tens up to hundreds of nA/m2. Not all discussed current sheets show the characteristic peak in plasma density at the centre of the sheet, which might be related to the presence of a guide field. There is no evidence for different kinds of plasmas on either side of a current sheet, and no strongly accelerated ions have been observed which could have been an indication of magnetic reconnection in the current sheets.
Issue Date: 22-Mar-2017
Date of Acceptance: 5-Mar-2017
URI: http://hdl.handle.net/10044/1/49456
DOI: https://dx.doi.org/10.1002/2017JA023861
ISSN: 2169-9402
Publisher: American Geophysical Union
Start Page: 3308
End Page: 3321
Journal / Book Title: Journal of Geophysical Research: Space Physics
Volume: 122
Issue: 3
Copyright Statement: © 2017 American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU.Volwerk, M., et al. (2017), Current sheets in comet 67P/Churyumov-Gerasimenko's coma, J. Geophys. Res. Space Physics, 122, 3308–3321, doi:10.1002/2017JA023861. To view the published open abstract, go to: https://dx.doi.org/10.1002/2017JA023861
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/K001051/1
ST/P002250/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Comet
Rosetta
RPC
ROSETTA PLASMA CONSORTIUM
INTERPLANETARY MAGNETIC-FIELD
LOW-FREQUENCY WAVES
SOLAR-WIND
INDUCED MAGNETOSPHERE
ION TAIL
HALLEY
GIOTTO
DISCONTINUITIES
ENCOUNTER
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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