Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh22f03s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH22F-03
Physics
2139 Interplanetary Shocks, 2152 Pickup Ions, 2159 Plasma Waves And Turbulence, 7843 Numerical Simulation Studies, 7851 Shock Waves
Scientific paper
Supercritical quasi-perpendicular shocks reflect part of the incident thermal population. These specularly reflected ions are accelerated by the upstream electric field parallel to the shock surface and turned around under the influence of the Lorentz force. These ions have gained sufficient energy to surmount the shock potential barrier that originally caused the reflection. In the downstream region these ions excite Alfven ion cyclotron and mirror mode waves which in turn scatter the ions. In the vicinity of the heliospheric termination shock the number density of pickup hydrogen ions is expected to be a significant fraction of the total hydrogen number density and may reach values comparable to that of specularly reflected ions. Thus the pickup hydrogen ions will considerably change the structure of the quasi-perpendicular termination shock. We have performed two-dimensional (2-D) hybrid simulations of quasi-perpendicular collisionless shocks where the pickup ions are included self-consistently. We have determined the change in the downstream turbulence due to the large pickup hydrogen contribution. Since in 2-D simulations cross-field diffusion is not allowed for, we have introduced an ad hoc cross-field scatter and have determined the reflection/injection efficiency for thermal solar wind ions versus pickup ions.
Kucharek Harald
Scholer Manfred
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