Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm51b..05f&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SM51B-05
Physics
2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2790 Substorms
Scientific paper
Previously, Chua et al. [2004] computed substorm time scales for over three hundred substorms observed by the Polar Ultraviolet Imager (UVI). They found that statistically the substorm recovery time scales for substorms occurring near winter solstice and equinox (when the nighttime auroral zone was in darkness) was roughly twice as long as the recovery time scale for substorms occurring in the summer (when the nighttime auroral region was sunlit). These results strongly suggest that auroral substorms in the northern and southern hemispheres develop differently during solstice conditions with substorms lasting longer in the dark (winter) hemisphere than 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 substorms. Here, we extend this previous statistical work by analyzing the recovery time scales for simultaneous, conjugate auroral substorms observed by Polar UVI and IMAGE FUV. However, in order to quantitatively compare conjugate substorm time scales, we first inter-calibrate the two instruments by calculating the recovery time scales for both instruments while viewing "same scene" substorms to determine the effect of different temporal and spectral resolutions on the recovery time scales. We will discuss our inter-calibration procedure and present initial results of simultaneous, conjugate auroral substorm recovery time scales.
Chua Damien
Fillingim Matthew O.
Germany Glynn A.
Spann James F.
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