Geospace Storms and Thermal Ions in the Near-Earth Magnetotail

Details Geospace Storms and Thermal Ions in the Near-Earth Magnetotail Geospace Storms and Thermal Ions in the Near-Earth Magnetotail

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm24a..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM24A-05

Physics

2736 Magnetosphere/Ionosphere Interactions (2431), 2744 Magnetotail, 2760 Plasma Convection (2463), 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

We report studies of the relationship of magnetic storms and substorms and the spatial distribution of thermal ions in the near-earth magnetotail using in-situ particle and field measurements from the Polar spacecraft, solar wind measurements from the ACE spacecraft, and ground geomagnetic Dst, Sym-H, AE, and Polar Cap indices between the years of 2000 and 2005. We found local time and latitudinal dependences on the occurrence and plasma moments of thermal ions at various level of geomagnetic storms and substorms. These dependencies are most correlated with the level of geomagnetic storms characterized by the Dst, or by Sym-H at much higher resolution when more subtle variations were introduced. The dependencies with the storm-time (occurred at high Dst values) substorms, characterized by AE (approximated with QL-AE 2000- 2001 and Asym-H proxy), showed similar trend with Dst but revealed differences at higher activity levels. The dependencies with the polar cap potential, characterized by the Polar Cap index for the northern hemisphere, is somewhat similar with AE at the mid level of activities but became less correlated at lower or at higher level. We will discuss the physical meaning of our finding and their implications to storm and substorm theories in our presentation.

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