Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31a0285a&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM31A-0285
Physics
2706 Cusp, 2723 Magnetic Reconnection (7526, 7835), 2728 Magnetosheath, 2736 Magnetosphere/Ionosphere Interactions (2431), 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
The geoeffectiveness of the extreme solar winds that flowed pass the Earth on 24 October 2003, 07 November 2004 and 09 November 2004 are presented using Cluster (FGM, CIS, PEACE, STAFF and EFW) and ground- based (EISCAT radars at 69.6N, 19.2E and IMAGE magnetometer network at 68-79N)observations. The Cluster observations suggest that magnetic reconnection need not be the main process for solar wind entry into the magnetosphere during extreme solar winds. The ion velocity in the magnetosheath-cusp region remains strongly anti-sunward and poleward and ion density remains high irrespective of IMF Bz is negative or positive. The ion velocity components are also found to agree with the ExB velocities. The ground-based observations indicate that the extreme solar winds directly affect the high latitude ionosphere. The solar wind plasma is found to enter the ionosphere through an afternoon cusp that descends to low latitudes during negative IMF Bz period when a westward electrojet is also found to ascend to high latitudes.
Alleyne Hugo
André Martial
Cornilleau-Wehrlin Nicole
Décréau Pierrette
Fazakerley Andrew
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