Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13b1208n&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM13B-1208
Other
2724 Magnetopause, Cusp, And Boundary Layers, 2731 Magnetosphere: Outer, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet
Scientific paper
We study the cold plasma sheet found in the near-earth magneotail is studied using the 9 years' data from the Geotail spacecraft. While it has been widely known that the cold plasma sheet (ion temperature < 1 keV) is formed near the both flanks under the northward IMF condition, the time scale as well as the mechanism of formation of the cold plasma sheet is now under debate. We show that the time lag from the northward turning of the IMF to the emergence of the cold plasma sheet is as short as a few hours on the both flanks. We further report that the cold plasma is found not only on the flanks but also at times deep inside the midnight plasma sheet only a few hours after the northward turning of the IMF. These observations suggest that some prompt transport process other than diffusion occurs, although diffusive processes may work on plasma transport near the flanks. We also show that the cold plasma sheet emerges on the dawnside during the weak IMF Bz periods, which implies dawn-dusk asymmetry in the formation of the cold plasma sheet.
Fujimoto Minoru
Hoshino Masahiro
Mukai Tadashi
Nishino Masaki N.
Saito Yukio
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