Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm21d..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM21D-03
Physics
2731 Magnetosphere: Outer, 2736 Magnetosphere/Ionosphere Interactions, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet
Scientific paper
Cluster ion measurements inside the tail lobes and inside the plasma sheet clearly indicate the ionosphere is supplying a large amount of ionospheric H+, O+ (He+, O++) ions to the magnetospheric mid-tail both during quiet and disturbed periods. Hydrogen ions and beams of oxygen ions are quasi systematically detected inside the lobe and inside the PSBL, flowing tailward with velocities of the order of 30-80 km/s. These ions are later energized deeper inside the plasma sheet. We analyze in detail the dynamics of this ionospheric magnetotail component, particularly during episodes of fast field aligned flow events of magnetospheric ions inside the PSBL: they drift perpendicular to the local B field either under the influence of diamagnetic pressure effects inside the flow itself or under the action of the electric field fluctuations associated with large alfvenic waves in the vicinity of the flow. Heating processes of oxygen ions inside the plasma sheet are briefly discussed.
Amata Ermanno
André Martial
Balogh André
Bavassano-Cataneo M.
Bosqued J.
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