Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm43b1329f&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM43B-1329
Physics
2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics, 2790 Substorms
Scientific paper
Previous work [Chua et al., 2004] computed the substorm recovery time scale for over three hundred substorms observed by the Polar Ultraviolet Imager (UVI). When sorted according to season, the substorm recovery times were well ordered by whether or not the nightside auroral region was sunlit: substorms occurring in the winter and equinox periods had similar recovery time scales which were both roughly a factor of two longer than that for summer when the auroral oval was sunlit. These results strongly suggest that simultaneous auroral intensifications in the northern and southern hemispheres develop differently during solstice conditions. We expect the auroral breakup in the dark (winter) hemisphere to be more intense and longer lived than that observed in the sunlit (summer) hemisphere. This also implies that more energy is deposited by electron precipitation in the winter hemisphere than in the summer one during a substorm. Here we extend this previous work by including a similar number of substorms observed by IMAGE Far Ultraviolet Imager (FUV) as well as simultaneous, conjugate auroral substorm observations by Polar UVI and the IMAGE FUV. The observed hemispheric asymmetry and non-conjugacy of auroral substorms is consistent with the suppression of discrete aurora in sunlight and highlights the importance of ionospheric conductivity plays in global-scale dynamics of the aurora and in magnetosphere-ionosphere coupling.
Chua Damien
Fillingim Matthew O.
Germany Glynn A.
Spann James F.
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