Characterizing the Classical Auroral Substorm: Statistical analysis of the UV emission patterns

Details Characterizing the Classical Auroral Substorm: Statistical analysis of the UV emission patterns Characterizing the Classical Auroral Substorm: Statistical analysis of the UV emission patterns

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm44b..02h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM44B-02

Physics

2790 Substorms

Scientific paper

We present a large statistical study of the spatial and temporal morphology of the auroral UV emission patterns during classical bulge-type auroral substorms. Images obtained by the Polar VIS Earth camera are utilized in the study of 119 carefully selected events. To reduce smearing of the key emission features due to the variations of the local times of onsets and rates of expansion and recovery, we normalize substorm time and positions of the western and eastern ends of the bulge region to an average substorm. Our empirical time dependent model displays a number of interesting features. Relative to the onset location the bulge spreads equally eastward and westward. The asymmetry of the bulge with respect to magnetic midnight is apparent from onset through early recovery phase. Two separate bright emission regions are apparent: 1) a pre-midnight region near the poleward edge of the bulge originating at the onset moving poleward and expanding eastward and westward at about the same rate; and 2) a slightly pre-midnight to post-midnight region which stays at the same latitude throughout the substorm. These can overlap in local time and latitude and vary in relative strength and position from event to event.

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