Seasonal variation of electron precipitation during substorms

Details Seasonal variation of electron precipitation during substorms Seasonal variation of electron precipitation during substorms

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm51b..06c&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM51B-06

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2704 Auroral Phenomena (2407), 2716 Energetic Particles: Precipitating, 2790 Substorms

Scientific paper

The hypothesis that ionospheric conductivity plays a major role in the global-scale dynamics of the aurora is further evaluated in this study. The rate of energy deposition by electron precipitation (hemispheric power), substorm expansion and recovery time scales, precipitating electron energy flux and characteristic energy, and the total electron energy input to the ionosphere/thermosphere during auroral intensifications are computed for over three hundred substorms observed by the Polar Ultraviolet Imager (UVI) in the northern hemisphere. Each substorm parameter is then sorted according to season. The characteristics of electron precipitation during substorms are well ordered by whether or not the nightside auroral region is sunlit. Conjugate auroral substorm observations by Polar UVI and the IMAGE FUV instrument are used to confirm this behavior. 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 this effect in magnetosphere-ionosphere coupling.

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