Ion Acceleration in Non-Stationary Shocks

Q. M. Lu 1 Z. W. Yang 1 Bertrand Lembège 2 S. Wang 1
2 HEPPI - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Previous particle-in-cell simulations have evidenced that quasi-perpendicular shocks are non-stationary and suffer a self-reformation on gyro scale of the incoming ions. In this paper, by separating the incoming ions into reflected and directly transmitted parts, we investigate ion acceleration in a non-stationary perpendicular shock. The results show that shock drift acceleration (SDA) is a dominant acceleration mechanism, while shock surfing acceleration (SSA) mechanism becomes more and more important with the increase of the initial particle energy (both their average final energy and percentage increase). The percentage of reflected ions cyclically varies in time with a period equal to the self reformation cycle.
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Submitted on : Monday, November 23, 2009 - 10:51:21 PM
Last modification on : Wednesday, May 15, 2019 - 3:33:24 AM

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Q. M. Lu, Z. W. Yang, Bertrand Lembège, S. Wang. Ion Acceleration in Non-Stationary Shocks. Shock Waves in Space and Astrophysical Environments, 18th Annual International Astrophysics Conference. AIP Conference Proceedings, Vol 1183, May 2009, Kona (Hawaii), United States. pp.39-46, ⟨10.1063/1.3266782⟩. ⟨hal-00435239⟩

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