Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Dynamics of the magnetosphere during extreme solar events of 2003, as is from the Meteor-3M and Express-A2 data: the radiation belts, the solar proton penetration boundary, and the regions of auroral precipitation
Tverskaya L.V., Avdyushin S.I., Feigin V.M., Ginzburg E.A., Ivanova T.A., Marjin B.V., Pavlov N.N., Sosnovets E.N., Svidsky P.M., Teltsov M.V.,

We analyzed the data on electrons of 0.17-8 MeV from Meteor-3M (polar circle orbit at altitude~1000 km) and the data on electrons of 0.8-6 MeV from Express-A2 (geosynchronous orbit). The outer radiation belt has been found at L~2.5 as follows from the peak intensity of >8 MeV electrons recorded after the storms 29-31 October 2003 and the storm 20-21 November 2003. Meanwhile, lower-energy electrons showed a multi-peak structure at L~2.5-4.5. Intensity of relativistic electrons was found to increase at some particular L-shells of the inner radiation belt. This happened on the main phases of the strong storms with |Dst|max>300 nT. Dynamics of the boundary of the solar proton penetration into the magnetosphere has been studied using the >90 MeV proton data from Meteor-3M. The boundary was identified as an intensity decrease by half of the polar plateau level. An extremely low excursion of the nightside boundary to the invariant latitude ~50 has been observed during the maximum of the storm 30 October 2003 (|Dst|max=401nT). In conjunction with the study of the solar-proton penetration boundary we analyzed a location of the auroral precipitation region (using the data on 0.1-15 keV electrons from Meteor-3M) and location of the westward electrojet.





Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004