HR: 1340h
AN: SM23A-0476    [Abstracts]
TI: Pc 1 Pulsations and Associated Ion Signatures Observed by the Cluster Spacecraft.
AU: * Hokenson, J M
EM: hokenson@augsburg.edu
AF: Augsburg College, 2211 Riverside Avenue, Minneapolis, MN 55454 United States
AU: Engebretson, M J
EM: engebret@augsburg.edu
AF: Augsburg College, 2211 Riverside Avenue, Minneapolis, MN 55454 United States
AU: Posch, J L
AF: Augsburg College, 2211 Riverside Avenue, Minneapolis, MN 55454 United States
AU: Glassmeier, K H
AF: Institute for Geophysics and Meteorology, Technical University of Braunschweig, Braunschweig, D-38106 Germany
AU: Zolotukhina, N A
AF: Institute of Solar-Terrestrial Physics, Lermontov 126, Irkutsk 33, 664033 Russian Federation
AU: Balogh, A
AF: Blackett Laboratory, Imperial College, London, CA SW7 2BZ United Kingdom
AU: Keiling, A
AF: Space Sciences Laboratory, University of California-Berkeley, Berkeley, CA 94720 United States
AU: Parks, G K
AF: Space Sciences Laboratory, University of California-Berkeley, Berkeley, CA 94720 United States
AU: Reme, H
AF: CESR, Touluse, Cedex, 4 France
AB: We present six examples of $\sim$0.5 Hz Pc 1 (ion cyclotron) wave activity observed by the Cluster satellites during 2002. Near perigee waves were observed as the spacecraft passed latitudinally through the dayside inner and middle magnetosphere. These waves were never observed at all four spacecraft, and hence are rather localized. Each was associated with highly structured plasma sheet / ring current ion distributions. One event, observed near the equator, provides strong evidence of a radial width of L$\sim$0.2. Another event observed when the spacecraft were near -40$\deg$ MLAT and also observed on the ground is associated with ion distributions similar to the "spatial" event category defined by Engebretson et al. [JGR 107, A12, 1451, 2002]. Near apogee in the tail lobes and/or plasma mantle, waves were observed essentially simultaneously (to within $\sim$ 5 min) for intervals of 0.5 - 3 hours at all four spacecraft in association with orders-of-magnitude step increases in ion density.
DE: 2731 Magnetosphere--outer
DE: 2752 MHD waves and instabilities
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting