HR: 13:55h
AN: SH53B-02    [Abstracts]
TI: Initial Survey of Very Energetic Upstream Ions
AU: * Wilber, M
EM: wilber@ssl.berkeley.edu
AF: Space Sciences Laboratory, U.C. Berkeley, 7 Gauss Way, Berkeley, CA 94720 United States
AU: Meziane, K
EM: karim@unb.ca
AF: Department of Physics, U. New Brunswick, Department of Physics, U. New Brunswick, Fredericton, NB E3B 5A3 Canada
AU: Mazelle, C
EM: Christian.Mazelle@cesr.fr
AF: CESR/CNRS, 9, Avenue du Colonel Roche, Cedex 4, Toulouse, 4346 31028 France
AU: Parks, G K
EM: parks@ssl.berkeley.edu
AF: Space Sciences Laboratory, U.C. Berkeley, 7 Gauss Way, Berkeley, CA 94720 United States
AU: Hull, A
EM: ahull@ssl.berkeley.edu
AF: Space Sciences Laboratory, U.C. Berkeley, 7 Gauss Way, Berkeley, CA 94720 United States
AU: Lucek, E
EM: e.lucek@imperial.ac.uk
AF: The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BW United Kingdom
AB: We present initial results from a survey of energetic (0.05--2.0~MeV) gyrating ion distributions seen by the Wind spacecraft in strongly perpendicular regions upstream of interplanetary and Earth's bow shocks. Some of the energetic backstreaming ions are observed within co-rotating interaction regions, or during solar energetic particle events, when there is a sufficient flux of energetic ions to seed production via shock drift acceleration (SDA). Several events, however, occur when there is no evidence of an energetic seed population, and SDA modeling on the ambient population fails to produce the fluxes observed. The later type of events raise new questions about the steps neccesary for producing strongly energized ions starting from an initially cold population.
DE: 2139 Interplanetary shocks
DE: 2154 Planetary bow shocks
DE: 7807 Charged particle motion and acceleration
DE: 7851 Shock waves (4455)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005