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Monte Carlo simulations of electron acceleration at bow waves driven by fast jets in the Earth’s magnetosheath

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Title: Monte Carlo simulations of electron acceleration at bow waves driven by fast jets in the Earth’s magnetosheath
Authors: Vuorinen, L
Vainio, R
Hietala, H
Liu, TZ
Item Type: Journal Article
Abstract: The shocked solar wind flows around the Earth’s magnetosphere in the magnetosheath downstream of the Earth’s bow shock. Within this region, faster flows of plasma, called magnetosheath jets, are frequently observed. These jets have been shown to sometimes exhibit supermagnetosonic speeds relative to the magnetosheath flow and to develop bow waves or shocks of their own. Such jet-driven bow waves have been observed to accelerate ions and electrons. We model electron acceleration by magnetosheath jet-driven bow waves using test-particle Monte Carlo simulations. Our simulations suggest that the energy increase of electrons with energies of a few hundred eV to 10 keV can be explained by a collapsing magnetic trap forming between the bow wave and the magnetopause with shock drift acceleration at the moving bow wave. Our simulations allow us to estimate the efficiency of acceleration as a function of different jet and magnetosheath parameters. Electron acceleration by jet-driven bow waves can increase the total acceleration in the parent shock environment, most likely also at shocks other than the Earth’s bow shock.
Issue Date: 4-Aug-2022
Date of Acceptance: 3-Jul-2022
URI: http://hdl.handle.net/10044/1/98100
DOI: 10.3847/1538-4357/ac7f42
ISSN: 0004-637X
Publisher: American Astronomical Society
Start Page: 1
End Page: 7
Journal / Book Title: The Astrophysical Journal: an international review of astronomy and astronomical physics
Volume: 934
Issue: 165
Copyright Statement: © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Sponsor/Funder: The Royal Society
Funder's Grant Number: URF\R1\180671
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
0201 Astronomical and Space Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0306 Physical Chemistry (incl. Structural)
Astronomy & Astrophysics
Publication Status: Published
Online Publication Date: 2022-08-04
Appears in Collections:Space and Atmospheric Physics
Faculty of Natural Sciences

This item is licensed under a Creative Commons License Creative Commons