HR: 0800h
AN: SH51B-1213    [Abstracts]
TI: The Impact of Shock Dynamic and Structure on Ion Reflection at the Quasi-Perpendicular Earths Bow Shock
AU: * Kucharek, H
EM: Harald.Kucharek@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AU: Behlke, R
EM: rico@irfu.se
AF: Swedish Inst Space Physics, Box 537, Uppsala, SE 751 21 Sweden
AU: Moebius, E
EM: eberhard.moebius@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AU: Scholer, M
EM: mbs@mpe.mpg.de
AF: Max-Planck-Institut fuer extraterrestrische Physik, Giessenbach, Garching, 85741 Germany
AU: Klecker, B
EM: berndt.klecker@mpe.mpg.de
AF: Max-Planck-Institut fuer extraterrestrische Physik, Giessenbach, Garching, 85741 Germany
AU: Mazelle, C
EM: Christian.Mazelle@cesr.fr
AF: CESR/CNRS Univ Paul Sabatier, 9 Ave Colonel Roche, Toulouse, 31028 France
AU: Mouikis, C
EM: chris.mouikis@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AU: Mouikis, C
EM: chris.mouikis@unh.edu
AF: Imperial College, Blackett Laboratory, London, SW7 2BW United Kingdom
AU: Kistler, L
EM: lynn.kistler@unh.edu
AF: University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AU: Lucek, E
EM: e.lucek@imperial.ac.uk
AF: Imperial College, Blackett Laboratory, London, SW7 2BW United Kingdom
AU: Eastwood, J
EM: jeastwood@lepvax.gsfc.nasa.gov
AF: NASA GSFC, Lab Extraterrestrial Physics Code 696 Electrodynamics Brnch, Greenbelt, MD 20771 United States
AU: Bale, S
EM: bale@ssl.berkeley.edu
AF: Univ Calif Berkeley Space Science Lab, Centenial Dr, Berkeley, CA 94720-0000 United States
AB: Cluster observations revealed new insights into the ion reflection and the formation of field-aligned beam at quasi-perpendicular Earths bow shock. It appears that beam ions emerge from the gyrating ions in the ramp of a quasi-perpendicular shock created by the same reflection process. In fact, effective scattering in pitch angle within the shock ramp during the reflection seem to be the production mechanism. Ion reflection, transmission and wave particle scattering depends on shock parameters, such as Mach number, plasma beta and shock angle. These processes may also depend on the internal dynamic structure and the cross-shock potential. All these parameters appear to control ion reflection at the shock and escape of ions into the upstream region, but their relative importance for the distribution of gyrating ions and for the ion beam intensity is still unknown. A better understanding will lead us to new models of ion reflection and transmission processes at perpendicular shocks in general: stationary and interplanetary traveling shocks. We combined FGM, EFW and CIS data to investigate the effect of particle scattering, cross-shock potential, and plasma parameters on the reflection properties of the quasi-perpendicular bow shock. Furthermore, we included the shock dynamics into a selected set of bow shock crossings in which we correlate the intensity the gyrating and the beam ions relative to the solar wind flux. We compared these flux values obtained under certain plasma conditions to determine the main controlling parameters for low and high Mach number shocks. We will also discuss these results within the framework of existing models and theories.
DE: 2411 Electric fields (2712)
DE: 2471 Plasma waves and instabilities (2772)
DE: 2483 Wave/particle interactions (7867)
DE: 4455 Nonlinear waves, shock waves, solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, DE: 5443 Magnetospheres (2756)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005