Структура и динамика полярных токовых систем : материалы международного симпозиума «Полярные геомагнитные явления», 25-31 мая, Суздаль, СССР / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т. – Апатиты : [б. и.], 1988.

EVENT STUDIES OF SUBSTORM DYNAMICS IN RELATION TO SOLAR WIND PARAMETERS. As we have seen the magnetic activity correlates beat of all with the parame- 2 ters В v or Вт. But the forecasting of the substorm dynamics using these S a parameters and pioking out the optimal time delays turned out to be successful only for a "smooth" part, of the substorm whereas a sharp burst of activity and some strong expansive phases were omitted. Fig. 13 shows аз an example the time behavior of predicted and original AL index during moderate activity (Clauer et al.,1981). A lot of event studies of magnetospheric disturbances has been carried out recently to define in detailes the relation of the magnetospheric processes to changes in the interplanetary medium. As a rule, a large collection of various satellite and background data obtained for an individual time interval has been taken as the basis for these studies. Two controversal points of view are presented in these studies. The first is the following. The magnetosphere is a primarily driven system (Fig.14a) in which the energy dissipation is proportional to input solar wind energy determined by the parameter i = v 2B s i n ' W 2 1 2 (Akasofu, 1981, 1986} Akasofu e.t al.,1985). This conclusion is based on the following results! - the AE and Dst indices show a simple linear relationship only during moderate disturbances, while for magnetic storms periods (when Dst > 50 nT) anticorrelation between AE and Dst may be seen, that is the growth of AE corresponds to decrease in Dst and vice versa* - the total energy dissipation in the magnetosphere consisting mainly of the Joule heat and ring current dissipation is well nori'elated with coupling parameter £ in a number of events; - therefore the solar wind energy put into the magnetosphere is redistrib uted between the ring currents and the polar magnetic disturbances without 1 >ading. This circumstance stipulates absenee of linear relationship between solar wind parameters and magnetic activity. Fig. 13. Comparison of predicted (heavy line) and original AL-index during moderate activity (Clauer et al.,1981). I28