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Electron Acceleration by Magnetosheath Jet-Driven Bow Waves




TekijätTerry Z. Liu, Heli Hietala, Vassilis Angelopoulos, Rami Vainio, Yuri Omelchenko

KustantajaAMER GEOPHYSICAL UNION

Julkaisuvuosi2020

JournalJournal of Geophysical Research: Space Physics

Tietokannassa oleva lehden nimiJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS

Lehden akronyymiJ GEOPHYS RES-SPACE

Artikkelin numeroARTN e2019JA027709

Vuosikerta125

Numero7

Sivujen määrä13

ISSN2169-9380

eISSN2169-9402

DOIhttps://doi.org/10.1029/2019JA027709

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/49712735


Tiivistelmä
Magnetosheath jets are localized fast flows with enhanced dynamic pressure. When they supermagnetosonically compress the ambient magnetosheath plasma, a bow wave or shock can form ahead of them. Such a bow wave was recently observed to accelerate ions and possibly electrons. The ion acceleration process was previously analyzed, but the electron acceleration process remains largely unexplored. Here we use multipoint observations by Time History of Events and Macroscale during Substorms from three events to determine whether and how magnetosheath jet-driven bow waves can accelerate electrons. We show that when suprathermal electrons in the ambient magnetosheath convect toward a bow wave, some electrons are shock-drift accelerated and reflected toward the ambient magnetosheath and others continue moving downstream of the bow wave resulting in bidirectional motion. Our study indicates that magnetosheath jet-driven bow waves can result in additional energization of suprathermal electrons in the magnetosheath. It implies that magnetosheath jets can increase the efficiency of electron acceleration at planetary bow shocks or other similar astrophysical environments.

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