Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Magnetospheric turbulence and storm-substorm relationship
Antonova E.E.,

The results of the theoretical and experimental investigations of the characteristics of the plasma turbulence in the magnetosphere of the Earth show the supports of the hypothesis of the formation of the magnetospheric tail as the turbulent wake under the obstacle - the magnetic field of the Earth. The existence of high level of plasma sheet turbulence explains the localization of substorm expansion phase onset deep in the magnetosphere on the quasidipole magnetic field lines (the effect of Akasofu - first auroral arc brightening on the equatorial boundary of the auroral oval). Experimental supports of the theory explaining the main features of substorm expansion phase onset are summarized. The formation of the radial profile of plasma pressure during magnetic storms is analyzed. The value of the upper limit of the inner magnetospheric plasma pressure is determined. The self-organized criticality (SOC) approach of the description of magnetospheric dynamics is discussed. It is shown that the theory of the formation of the radial dependence of the plasma pressure in the inner magnetosphere can help to understand the SOC approach for the description of the magnetosphic processes.





Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004