Geophysical Research Letters
Geophysical Research Letters
5 years ago

In situ observations of a magnetosheath high-speed jet triggering magnetopause reconnection

F. Plaschke, H. Hietala, T. Karlsson, M. Oieroset, T. D. Phan, V. Angelopoulos, M. O. Archer
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 THEMIS spacecraft in a string-of-pearls configuration on August 7, 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 pre-impact crossing, yet three probes observed reconnection after the impact. We infer that the jet impact compressed the originally thick (60 − 70di), 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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/2017GL076525

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