Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Electrodynamic parameters of substorms of the period of extreme events of November 20, 2003. 3. Dynamics of systems of field-aligned currents and convection systems.
Mishin V.M., Foerster M., Golovkov V.P., Saifudinova T.I., Bazarzhapov A.D., Karavaev Yu.A., Stauning P., Watermann J.,

Under the data of the MIT, with usage of electric field measurements on satellites Cluster (see our Poster 1), the dynamics of systems of field-aligned currents (FACs) and ionospheric convection systems are described and discussed. Are mentioned and discussed three maximums of the FACs density in the ionosphere, unaccounted in early models but observed systematically in each Region of Iijima and Potemra. These three maximums are placed in the near-noon region, near the dawn-dusk meridian, and near the midnight meridian. The model of the FACs generators is suggested with the above heterogeneities taken into account. A twisting clockwise of the FACs density spatial distribution, which is systematically observed with an increasing of an activity level, is described and discussed. Clearly expressed convection vortexes in the polar ionosphere, caused by the above-mentioned FACs density heterogeneities, are mentioned for the first time and discussed. The systems of FACs and convection systems of substorms, characteristic for two types of boundary conditions, are compared: a) When FACs, observed in day time sector, are formed principally by the dayside merging, and b) When a dominant reason is the interplanetary shock. Is shown that directions of FACs in day time sector are varied on opposite ones at transition from conditions a) to b) in three Regions of Iijima and Potemra. The results are compared with those of MHD modeling.

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004