Timing, Location, and Dynamic Evolution of Auroral Substorm

Details Timing, Location, and Dynamic Evolution of Auroral Substorm Timing, Location, and Dynamic Evolution of Auroral Substorm

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm22b06m&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM22B-06

Physics

2700 Magnetospheric Physics

Scientific paper

Knowing when and where a substorm is to take place is a vexing problem in magnetospheric physics. In this paper, we will take and integrate current and previous results based on Polar Ultraviolet Imager (UVI) observations to construct the phenomenology of auroral substorm. The timing and location of substorm, as well as, the dynamic evolution of auroral substorm will be focused. A large number (676) of auroral substorm events have been obtained, based on approximately 1 years (1996 - 1997) worth of global auroral images acquired from UVI, and the onset location for each substorm onset has been determined. The most likely onset location is found to be approximately 2230 magnetic local time and approximately 66.8 degrees magnetic latitude. When mapped to the magnetosphere equatorial plane with T89 magnetic field model, the majority of the events were found to initiate within 10 Earth radii in the premidnight sector. This onset radial location is consistent with many other results obtained from different means, such as those deduced from the delay of Pi2 pulsation and dispersionless energetic particle injection with respect to auroral breakup. The dynamic evolution of auroral substorm will also be given by using superposed epoch analysis of inferred auroral power at different local time sectors. A quantitative constraint for substorm models will be provided.

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