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. 2. Variations of the polar cap potential drop
Mishin V.M., Foerster M., Golovkov V.P., Saifudinova T.I., Bazarzhapov A.D., Karavaev Yu.A., Stauning P., Watermann J.,

By making use of the magnetogram inversion technique data together with measurements of the electric field on Cluster (see our Poster1, this session), the polar cap potential drop ($U$) variations during substorms at the interval (0000 - 1500) UT, 20.11.2003 are studied. Is fulfilled the test of the earlier established semi-empirical relationship $U(t+\tau)=\Psi/kt$, where $\Psi$ - the magnetic flux through the area of the polar cap formed in the course of the considered substorm loading phase, $t$ - the time from the loading beginning, $\tau=t_m-t_0, t_0$ - the instant of the jump $\Delta (t_0)$ of the dayside reconnection rate $M$, and $t_m$ - the instant when the change of the polar cap potential drop $\Delta U(t_m)$ attains the level $\Delta M(t_0)$ in the course of the loading. The estimates of effective inductance $L=\tau R$ are obtained. The characteristics of a saturation of $\Delta M$ and $\Delta U(t_m)$ at a level $\sim 150-200$ kV are obtained and discussed.

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004