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In situ observations of a magnetosheath high-speed jet triggering magnetopause reconnection
File(s)
Author(s)
Hietala, H
Phan, TD
Angelopoulos, V
Oieroset, M
Archer, MO
Type
Journal Article
Abstract
Magnetosheath high‐speed jets—localized dynamic pressure enhancements typically of ∼1 Earth radius in size—impact the dayside magnetopause several times per hour. Here we present the first in situ measurements suggesting that such an impact triggered magnetopause reconnection. We use observations from the five Time History of Events and Macroscale Interactions during Substorms spacecraft in a string‐of‐pearls configuration on 7 August 2007. The spacecraft recorded magnetopause in‐and‐out motion during an impact of a magnetosheath jet (VN∼−300 km/s along the magnetopause normal direction). There was no evidence for reconnection for the preimpact crossing, yet three probes observed reconnection after the impact. We infer that the jet impact compressed the originally thick (60–70 di), high magnetic shear (140–160° magnetopause until it was thin enough for reconnection to occur. Magnetosheath high‐speed jets could therefore act as a driver for bursty dayside reconnection.
Date Issued
2018-02-28
Date Acceptance
2018-01-29
Citation
Geophysical Research Letters, 2018, 45 (4), pp.1732-1740
URI
DOI
ISSN
0094-8276
Publisher
American Geophysical Union
Start Page
1732
End Page
1740
Journal / Book Title
Geophysical Research Letters
Volume
45
Issue
4
Copyright Statement
© 2018 American Geophysical Union. All Rights Reserved. This is the accepted version of the following article: Geophysical Research Letters, Volume 45, Issue 4,
28 February 2018, p.1732-1740, which has been published in final form at https://dx.doi.org/10.1002/2017GL076525
Subjects
Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
high-speed jets
magnetosheath
magnetopause reconnection
solar wind-magnetosphere coupling
LATITUDE DAYSIDE MAGNETOPAUSE
HIGH MAGNETIC SHEAR
BOUNDARY-LAYER
BOW SHOCK
SUBSOLAR MAGNETOSHEATH
EARTHS MAGNETOSHEATH
PRESSURE PULSES
SOLAR-WIND
FIELD
THEMIS
Publication Status
Published
Date Publish Online
2018-02-22