HR: 15:10h
AN: SM13C-07    [Abstracts]
TI: Investigation of Ion Beams in the PSBL using Cluster
AU: * Keiling, A
EM: keiling@ssl.berkeley.edu
AF: Space Sciences Lab, 7 Gauss Way, Berkeley, 94720
AU: Parks, G K
AF: Space Sciences Lab, 7 Gauss Way, Berkeley, 94720
AU: Reme, H
AF: CESR, 9 ave du Colonel Roche, Toulouse, 00000
AU: Dandouras, I
AF: CESR, 9 ave du Colonel Roche, Toulouse, 00000
AU: Bosqued, J
AF: CESR, 9 ave du Colonel Roche, Toulouse, 00000
AU: McCarthy, M
AF: Geophysics, U of Washington, Seattle, 98195
AU: Moebius, E
AF: U of New Hampshire, 39 College Road, Durham, 03824
AU: Amata, E
AF: IFSI, 100 Via del Fosso del Cavaliere, Rome, 00133
AU: Klecker, B
AF: MPI, Karl-Schwarzschild Strasse 1, Garching, 85741
AU: Korth, A
AF: MPI, Max-Planck Strasse 2, Katlenburg-Lindau, 37189
AU: Lundin, R
AF: Swedish Institute of Space Physics, PO Box 812, Kiruna, 98128
AB: With every new spacecraft traversing the plasma sheet boundary layer (PSBL) new properties of ion beams are identified. Clusters multipoint measurement capability allowed us to study in great detail the intricate nature of energy-dispersed ions (at 4-5 Re) which were substructured into several (up to four) beamlets with a quasi-periodicity of 1-3 min. New ion properties could be identified associated with the energy range, the spatial extent and the energy dispersion types. The ion beamlet injections occurred at distances larger than 50 Re in the tail and showed both temporal (time-of-flight) and spatial effects. We propose an injection scenario (impulsive and recurrent) in the distant current sheet to understand the spatio-temporal history of these energy-dispersed ion beamlets. Furthermore, we show evidence that the beamlets can undergo several bounces in the tail while staying coherent. These results add significantly to the known realm of plasma sheet dynamics.
DE: 2716 Energetic particles, precipitating
DE: 2720 Energetic particles, trapped
DE: 2731 Magnetosphere--outer
DE: 2748 Magnetotail boundary layers
DE: 2764 Plasma sheet
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting