Abstract
Abstract . The present work examines the relations between Polar Cap (PC) indices and the 1-min SYM-H and hourly Dst indices characterizing total (symmetrical) magnetospheric ring current intensities with particular emphasis on possible space weather applications. Using real-time PC indices in a source function may provide gradient values for the ring current intensities characterized by the Dst or SYM-H indices. Upon integration during magnetic storm events the PC-based gradients may provide estimate of ring current index values up to one hour ahead. In a study of the strongest storm events in 2009-2018, the average correlation between real and corresponding equivalent SYM-H index values based on simulated real-time PC indices was 0.836. It is demonstrated that amplitude relations and timing differences for peak polar cap and ring current indices suggested in publications over the years and in a recent report from the International Standards Organisation (ISO) are not valid particularly for the stronger magnetic storms (Dst(peak)<-90 nT) and could be misleading.
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