Ion Larmor radius effects near a reconnection X line at the magnetopause: THEMIS observations and simulation comparison

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Title: Ion Larmor radius effects near a reconnection X line at the magnetopause: THEMIS observations and simulation comparison
Authors: Phan, TD
Shay, MA
Haggerty, CC
Gosling, JT
Eastwood, JP
Fujimoto, M
Malakit, K
Mozer, FS
Cassak, PA
Oieroset, M
Angelopoulos, V
Item Type: Journal Article
Abstract: We report a Time History of Events and Macroscale Interactions during Substorms (THEMIS-D) spacecraft crossing of a magnetopause reconnection exhaust ~9 ion skin depths (di) downstream of an X line. The crossing was characterized by ion jetting at speeds substantially below the predicted reconnection outflow speed. In the magnetospheric inflow region THEMIS detected (a) penetration of magnetosheath ions and the resulting flows perpendicular to the reconnection plane, (b) ion outflow extending into the magnetosphere, and (c) enhanced electron parallel temperature. Comparison with a simulation suggests that these signatures are associated with the gyration of magnetosheath ions onto magnetospheric field lines due to the shift of the flow stagnation point toward the low-density magnetosphere. Our observations indicate that these effects, ~2–3 di in width, extend at least 9 di downstream of the X line. The detection of these signatures could indicate large-scale proximity of the X line but do not imply that the spacecraft was upstream of the electron diffusion region.
Issue Date: 11-Aug-2016
Date of Acceptance: 10-Aug-2016
URI: http://hdl.handle.net/10044/1/40953
DOI: http://dx.doi.org/10.1002/2016GL070224
ISSN: 0094-8276
Publisher: American Geophysical Union
Start Page: 8844
End Page: 8852
Journal / Book Title: Geophysical Research Letters
Volume: 43
Issue: 17
Copyright Statement: © 2016 American Geophysical Union. All Rights Reserved
Sponsor/Funder: Imperial College Trust
Science and Technology Facilities Council (STFC)
Funder's Grant Number: N/A
ST/K001051/1
Keywords: Meteorology & Atmospheric Sciences
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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