Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31a2076m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31A-2076
Physics
[2712] Magnetospheric Physics / Electric Fields, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [2799] Magnetospheric Physics / General Or Miscellaneous
Scientific paper
To estimate the dependence of the Dst index on the PC index and the interplanetary electric field(Ey), the variations of the PC index and Ey during geomagnetic storms are examined using the data obtained during the period from 1996 to 2003. First, the correlation between the Dst and PC indices is slightly higher than that of between the Dst and Ey. Considering that the Dst index is a proxy representing the solar wind energy accumulated in the inner magnetosphere, it may be reasonable to use the integrated PC index instead of the standard one during magnetic storms particularly during the main phase. Thus, these relations are reexamined during based on the time-integrated index. As a result, the correlation coefficient between the integrated PC index and the Dst index found to be significantly high exceeding 0.9 whereas the correlation between the time-integrated Ey and Dst index is less than that, indicating the PC index is a more reliable one in monitoring the Dst index during magnetic storms. To assess the role of the PC index during the recovery phase of a storm, the correlation between the PC index and Dst index during the recovery phase is examined separately. It would provide a clue on the role of the energy injection during the recovery phase in extending the duration time. Monthly variations of the PC index, Ey and Dst index are also examined with the same stormtime database. As expected the monthly variation of the Dst index shows a distinct characteristics with peaks during equinoctial season. On the other hand the Ey and PC index shows higher values during autumn than spring.
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