Evolution of the plasma sheet cold-dense ions during periods of northward IMF

Details Evolution of the plasma sheet cold-dense ions during periods of northward IMF Evolution of the plasma sheet cold-dense ions during periods of northward IMF

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13a1205w&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM13A-1205A

Physics

2764 Plasma Sheet, 2736 Magnetosphere/Ionosphere Interactions, 2728 Magnetosheath

Scientific paper

Although it is well known that the plasma sheet is very dynamic during magnetically active times, it is not devoid of changes during periods of northward IMF. The plasma sheet density (n), temperature (T), and pressure (p) continue to exhibit changes for several hours after IMF northward turning, before eventually reaching cold-dense quasi-steady state. We have recently developed a technique that integrates low-altitude ionospheric observations to create 2-D/3-D global images of the plasma sheet ion p, T, and n. This method relies on the plasma sheet plasma isotropy, which has a strong theoretical foundation as well as overwhelming observational support. Plasma sheet n and T obtained from applying this method to DMSP data along with in situ observations are used to study the formation of cold-dense ion and its evolutions during periods of northward IMF. The 2-D plasma sheet n and T profiles exhibit dawn-dusk asymmetry of the cold-dense ion distribution, which is consistent with (1) the mixing of the magnetosheath and plasma sheet ions and (2) ion transport dominated by gradient/curvature and ExB drifts.

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