THE ELECTRIC POTENTIAL DISTRIBUTION IN THE DISTURBED POLAR IONOSPHERE: COMPARISON OF STATISTICAL MODELS WITH THE DATA OF SELECTED SUBSTORM INTERVALS

Large-scale maps of the electric potential distribution in the disturbed polar ionosphere during the relatively weak 26 February 2008 substorm obtained by two different methods, are compared with each other. One series of the electric potential maps has been derived on the basis of SuperDARN measurement data, another set maps has been calculated by the magnetogram inversion technique. We also compare graphs of variation of the cross polar cap potential drop during the considered substorm, obtained by the two methods. The SuperDARN maps are founded to mainly describe the regular, whereas the MIT maps - both regular and irregular components of the spatial electric potential distribution.