HR: 17:15h
AN: SH34A-06    [Abstracts]
TI: Upstream Diffuse Ions and Association With Low Frequency Hydromagnetic Waves: Cluster Observations at the Quasi-Parallel Earth's Bow Shock
AU: * Scholer, M
EM: mbs@mpe.mpg.de
AF: Max-Planck-Inst. extraterr. Physik, P.O. Box 1312, Garching, 85741 Germany
AU: Kis, A
EM: akis@mpe.mpg.de
AF: Max-Planck-Inst. extraterr. Physik, P.O. Box 1312, Garching, 85741 Germany
AU: Lucek, E A
EM: e.lucek@imperial.ac.uk
AF: Imperial College, Blackett lab., London, SW7 2BW United Kingdom
AU: Klecker, B
EM: berndt.klecker@mpe.mpg.de
AF: Max-Planck-Inst. extraterr. Physik, P.O. Box 1312, Garching, 85741 Germany
AU: Moebius, E
EM: eberhard.moebius@unh.edu
AF: University of New Hampshire, EOS, Durham, 03824 United States
AU: Reme, H
EM: henri.reme@cesr.fr
AF: CESR, 9 Ave Colonel Roche, Toulouse, 31028 France
AU: Bosqued, J M
EM: bosqued@cesr.fr
AF: CESR, 9 Ave Colonel Roche, Toulouse, 31028 France
AU: Kistler, L M
EM: lynn.kistler@unh.edu
AF: University of New Hampshire, EOS, Durham, 03824 United States
AU: Kucharek, H
EM: kucharek@atlas.sr.unh.edu
AF: CESR, 9 Ave Colonel Roche, Toulouse, 31028 France
AB: We investigate quasi-linear theory of ion acceleration at Earth's quasi-parallel bow shock using Cluster magnetic field and particle measurements during an upstream diffuse ion event (February 18, 2003). Simultaneous magnetic field power spectra far upstream obtained by ACE show that the interplanetary fluctution level in the region of resonant frequencies was orders of magneitude lower than near the bow shock, so that the fluctuations near the bow shock were excited by backstreaming ions. In particular, we determine the energetic ion spatial profile, the dependence of the upstream ion scalelength upon energy, the behavior of the energetic ion anisotropy upstream and downstream of the shock, the spatial scale lenghts of the low frequency upstream waves that resonate with them, and the dependence of the integrated wave energy density upon the ion energy density at the shock.
DE: 7851 Shock waves
DE: 7867 Wave/particle interactions
DE: 2154 Planetary bow shocks
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting