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Perpendicular shock reformation and ion acceleration
Ist Teil von
Space science reviews, 2005-11, Vol.121 (1-4), p.5-19
Ort / Verlag
Dordrecht: Springer
Erscheinungsjahr
2005
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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.