Downstream high-speed plasma jet generation as a direct consequence of shock reformation

Savvas Raptis (), Tomas Karlsson, Andris Vaivads, Craig Pollock, Ferdinand Plaschke, Andreas Johlander, Henriette Trollvik and Per-Arne Lindqvist
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Savvas Raptis: Division of Space and Plasma Physics - KTH Royal Institute of Technology
Tomas Karlsson: Division of Space and Plasma Physics - KTH Royal Institute of Technology
Andris Vaivads: Division of Space and Plasma Physics - KTH Royal Institute of Technology
Craig Pollock: Denali Scientific
Ferdinand Plaschke: Technische Universität Braunschweig
Andreas Johlander: University of Helsinki
Henriette Trollvik: Division of Space and Plasma Physics - KTH Royal Institute of Technology
Per-Arne Lindqvist: Division of Space and Plasma Physics - KTH Royal Institute of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Shocks are one of nature’s most powerful particle accelerators and have been connected to relativistic electron acceleration and cosmic rays. Upstream shock observations include wave generation, wave-particle interactions and magnetic compressive structures, while at the shock and downstream, particle acceleration, magnetic reconnection and plasma jets can be observed. Here, using Magnetospheric Multiscale (MMS) we show in-situ evidence of high-speed downstream flows (jets) generated at the Earth’s bow shock as a direct consequence of shock reformation. Jets are observed downstream due to a combined effect of upstream plasma wave evolution and an ongoing reformation cycle of the bow shock. This generation process can also be applicable to planetary and astrophysical plasmas where collisionless shocks are commonly found.

Date: 2022
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DOI: 10.1038/s41467-022-28110-4

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