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Föreläsare: Prof. Sandra C. Chapman (Univ. of Warwick, UK)
Datum och tid: 2004-09-09 00:00
Plats:
PIC simulations of reforming quasiperpendicular collisionless shocks - consequences for particle acceleration.
It has been suggested that supercritical shocks provide a variety of mechanisms for particle acceleration leading to cosmic ray generation. PIC simulations of quasiperpendicular shocks have recently shown that for certain parameters the shock solution is no longer static- as found in previous Hybrid simulations- but rather reforms on the gyroscales of the ions. These parameters, in particular low upstream proton thermal speed as compared to the inflow speed, are favoured at SNRs and at the heliospheric termination shock. This talk will focus on the initial stages of particle acceleration in reforming shocks from the background to a suprathermal \'injection\' population which can then Fermi accelerate to cosmic ray energies.
Skapad 2004-12-06 16:22:16 av
Senast ändrad 2004-12-06 16:23:34 av
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