Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm21b0203f&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM21B-0203
Physics
7859 Transport Processes
Scientific paper
The structure of the plasma sheet under northward IMF is studied by data from the Geotail spacecraft. The plasma sheet is known to become cold and dense (T < 2 keV, n > 1 cm-3) during extended northward IMF periods. We show that such cold-dense ions (CDIs) appear at | Ygsm | > 10 Re, that is, 10 Re off the tail axis to both flanks. CDIs on the dawnside have higher temperatures and some reach the upper-limit of 2 keV that we use to select CDIs. These CDIs having the highest temperature are distributed at the dawnside plasma sheet inner-edge (R < 15 Re) and is connected to the hot-dense ions (HDIs: T > 2 keV, n > 1 cm-3) in the further inner region. A survey shows that HDIs under nominal solar wind dynamic pressure appear mostly in the dawnside inner-magnetosphere during extended northward IMF intervals. Both results point to the idea that HDIs are the inner-magnetosphere extension of dawnside CDIs, while such a partner to the duskside CDIs cannot be identified. This structure of the plasma sheet suggests that there is significant dawn-dusk asymmetry in heating and transport in the magnetotail under northward IMF.
Fujimoto Minoru
Kokubun Susumu
Mukai Tadashi
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