Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm44b..06o&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM44B-06
Physics
2721 Field-Aligned Currents And Current Systems (2409), 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection (2463), 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The present study statistically compares the geosynchronous magnetic field during the main and recovery phases of magnetospheric storms. The storm phases are determined based on the Sym-H index, and GOES magnetic field measurements are sorted in terms of Sym-H. It is found that if Sym-H is at the same level, the nightside geosynchronous magnetic field is more stretched, therefore, the tail current is more intense, during the main phase than during the recovery phase. The present result suggests that the relative contribution of the tail current to Sym-H is larger during the main phase than during the recovery phase. Interestingly, the tendency is just the opposite in the midday sector. That is, the geosynchronous magnetic field is less stretched during the main phase than during the recovery phase. The corresponding feature can be found in a storm-time ring current model, which suggests that the ring current is actually weakened in the midday sector during the main phase. Enhanced convection during the main phase prevents energetic ions from completing closed orbits. Instead those ions leak from the magnetopause before they reach the midday sector, and consequently the midday sector is less populated by energetic ions. The present result is consistent with the idea that the ring current is highly asymmetric during the storm main phase.
Ebihara Yasuhiro
Ohtani Shin
Singer Howard J.
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