Perpendicular Shock Reformation and Ion Acceleration |
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Authors: | S C Chapman R E Lee R O Dendy |
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Institution: | (1) Space and Astrophysics Group and Centre for Scientific Computing, University of Warwick, Coventry, CV4 7AL, U.K.;(2) UKAEA Culham Division, Culham Science Centre, Abingdon, Oxon, OX14 3DB, U.K. |
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Abstract: | Kinetic simulations of supercritical, quasi-perpendicular shocks yield time-varying solutions that cyclically reform on proton
spatio-temporal scales. Whether a shock solution is stationary or reforming depends upon the plasma parameters which, for
SNR shocks and the heliospheric termination shock, are ill defined but believed to be within this time-dependent regime. We
first review the time-dependent solutions and the acceleration processes of the ions for a proton–electron plasma. We then
present recent results for a three-component plasma: background protons, electrons and a second ion population appropriate
for SNR (heavy ions) or the termination shock (pickup protons). This ion acceleration generates a suprathermal “injection”
population – a seed population for subsequent acceleration at the shock, which may in turn generate ions at cosmic ray energies. |
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Keywords: | collisionless shocks cosmic rays supernovae remnants heliospheric termination shock |
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