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Polar cap and auroral oval dynamics in the course of severe magnetic storm. Model results and case study: October 2003 storm.
Alexeev I. I., Belenkaya E.S., Bobrovnikov S.Yu., Kalegaev V.V.,
A dependence of the polar cap magnetic flux on the solar wind dynamic pressure is studied. The model calculations of the relation of the polar cap to the polar oval magnetic fluxes are presented. The model results give us a possibility to find the extreme values of the polar cap and auroral oval magnetic fluxes. These values can be reached in the course of the severe magnetic storm. The scaling law for the polar cap diameter changing for different magnetopause subsolar distances is demonstrated. The model calculations compare with solar particle precipitation boundaries, and TIMED UVI data during October 28-31, 2003 storm.