HR: 1340h
AN: SH44A-1708    [Abstracts]
TI: Ion dynamics in high-latitude reconnection event: Interball-Tail observations.
AU: * Vaisberg, O
EM: olegv@iki.rssi.ru
AF: Space Resaerch Institute, RAS, Profsouznaya 84/32, Moscow, 119997, Russian Federation
AU: Avanov, L A
EM: Levon.A.Avanov@nasa.gov
AF: NSSTC/CSPAR/UAH, 320 Sparkman Drive, Hunstville, AL 35805, United States
AU: Smirnov, V N
EM: vsmirn@iki.rssi.ru
AF: Space Resaerch Institute, RAS, Profsouznaya 84/32, Moscow, 119997, Russian Federation
AU: Zelenyi, L M
EM: Lzelenyi@iki.rssi.ru
AF: Space Resaerch Institute, RAS, Profsouznaya 84/32, Moscow, 119997, Russian Federation
AU: Koinash, G
AF: Space Resaerch Institute, RAS, Profsouznaya 84/32, Moscow, 119997, Russian Federation
AB: We analyze ion velocity distributions observed by the Interball Tail spacecraft within reconnection events under northward IMF at the lobe magnetopause. Open flux tubes were observed while the spacecraft crossed the magnetopause. These flux tubes have clear signatures of the rotational discontinuity. Magnetospheric and magnetosheath plasma components exchange along open field lines follow velocity cut-offs (D-shaped distributions) in accordance with Cowley diagram for magnetic flux tube convecting with deHoffman-Teller velocity. Parallel velocity cut-off depends on perpendicular velocity. Magnetosheath ion component entering the magnetospheric part of open flux tube undergoes appreciable heating. We discuss possible mechanisms that are responsible for details of velocity distributions of ion components exchanging along open field lines. Regions with very low magnetic field magnitude were also observed suggesting diffusion region crossing. We use observations to infer the location of reconnection region and to discuss evidence for non-stationary reconnection.
DE: 2723 Magnetic reconnection (7526, 7835)
DE: 7513 Coronal mass ejections (2101)
DE: 7519 Flares
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting