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Magnetospheric configuration and its changes during severe magnetic storms in October 2003 based on energetic particle characteristics
Bagautdinova G. R., Sergeev V. A., Lvova E. A., Evans D. S., Fritz T. A. , Newell P. T. ,
Magnetospheric configuration and its changes can be probed with the help of energetic particles providing that interpretation of specific energetic particle features is known. Severe storms at the end of October 2003, which also had strong solar particle events associated, give interesting possibilities to advance in this understanding with the help of a fleet of many spacecraft. First, early in this event a remarkable asymmetry of intense energetic solar electrons (E>30 keV) in north and south polar caps was observed, allowing to diagnose the open-closed field-line boundaries as well as the penetration of solar electrons into the closed flux tube regions. We investigate this penetration taking advantage of simultaneous particle probing in the solar wind, magnetosphere and low altitudes. Second, by using data of polar orbiting spacecraft we show the evolution of isotropic boundaries of energetic protons during the storms on 29-31 October 2003 and compare them with the predictions based on storm-time Tsyganenko magnetospheric model to discuss the physical interpretation of observed isotropic boundaries during such catastrophic events.