Spatial Distribution of Dense Plasma in the Near-Earth Plasma Sheet and its Transport Into the Inner Magnetosphere

Details Spatial Distribution of Dense Plasma in the Near-Earth Plasma Sheet and its Transport Into the Inner Magnetosphere Spatial Distribution of Dense Plasma in the Near-Earth Plasma Sheet and its Transport Into the Inner Magnetosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31b1718i&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM31B-1718

Physics

2700 Magnetospheric Physics (6939), 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions, 7859 Transport Processes, 7954 Magnetic Storms (2788)

Scientific paper

We investigate the cold-dense plasma sheet (CDPS) on November 12 and 13, 2007 by using THEMIS, Geotail, and LANL satellite. During the last extend period of northward IMF, 2-component CDPS in the duskside plasma sheet (PS), single component CDPS in the dawnside PS, and hot-dense ions (HDIs) at the inner edge of the PS on the dawnside were observed by Geotail, THC, and THA simultaneously. Then, super-dense plasma sheet (SDPS) was detected near the midnight region at geosynchronous orbit (GEO) (i) 1 hour after the southward turning of the IMF and (ii) at the rapid enhancement of the solar wind density (4 hours after (i)). Focusing on (i), duskward moving HDIs and earthward fast flow were encountered by Geotail in the pre-midnight PS. The appearance of SDPS and energetic electrons was in good association with this fast flow. We suggest that HDIs on the dawnside moved to the pre-midnight PS and they were pushed into GEO by the fast flow. After both observations of SDPS, the dense plasma was not seen on the dawnside where THA had detected HDIs (X < ~-5 Re), while it existed earthward of the region. Although these periods were front parts of corotating interaction region (CIR), geomagnetic activity was very weak. We discuss the transport mechanism and the geoeffectiveness of the dense plasma.

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