Ion Acceleration by Flux Transfer Events in the Terrestrial Magnetosheath

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Järvinen , R , Vainio , R , Palmroth , M , Juusola , L , Hoilijoki , S , Pfau-Kempf , Y , Ganse , U , Turc , L & von Alfthan , S 2018 , ' Ion Acceleration by Flux Transfer Events in the Terrestrial Magnetosheath ' Geophysical Research Letters , vol. 45 , no. 4 , pp. 1723-1731 . DOI: 10.1002/2017GL076192

Title: Ion Acceleration by Flux Transfer Events in the Terrestrial Magnetosheath
Author: Järvinen, R.; Vainio, R.; Palmroth, M.; Juusola, L.; Hoilijoki, S.; Pfau-Kempf, Y.; Ganse, U.; Turc, L.; von Alfthan, S.
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Division of Geophysics and Astronomy
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Particle Physics and Astrophysics
Date: 2018-02-28
Language: eng
Number of pages: 9
Belongs to series: Geophysical Research Letters
ISSN: 0094-8276
DOI: https://doi.org/10.1002/2017GL076192
URI: http://hdl.handle.net/10138/234758
Abstract: We report ion acceleration by flux transfer events in the terrestrial magnetosheath in a global two-dimensional hybrid-Vlasov polar plane simulation of Earth's solar wind interaction. In the model we find that propagating flux transfer events created in magnetic reconnection at the dayside magnetopause drive fast-mode bow waves in the magnetosheath, which accelerate ions in the shocked solar wind flow. The acceleration at the bow waves is caused by a shock drift-like acceleration process under stationary solar wind and interplanetary magnetic field upstream conditions. Thus, the energization is not externally driven but results from plasma dynamics within the magnetosheath. Energetic proton populations reach the energy of 30 keV, and their velocity distributions resemble time-energy dispersive ion injections observed by the Cluster spacecraft in the magnetosheath.
Subject: magnetosheath
ion acceleration
flux transfer event
dispersion
injection
bow wave
DAYSIDE MAGNETOPAUSE
RECONNECTION
CLUSTER
SHOCK
SIGNATURES
TRANSIENT
CUSP
IMF
114 Physical sciences
1171 Geosciences
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