Long Period Geomagnetic Pulsations Associated with Storm Sudden Commencements(Psc5) （ I ) Morphological Study
Kuwashima, M.
Abstract
Damped-type long period geomagnetic pulsations having the periods of the order of a few minutes associated with storm sudden commencements, Psc5's, are studied using the rapid-run magnetograms during IGY. Important results obtained through the present analysis are:
1. That the duration and local time dependence of Psc5 show the different characteristics to those of corresponding period-range, Pc5.
2. The events of Psc5 occur coherently over a wide area, and the coherency is more prominent along the auroral zone.
3. That the area where the event of Psc5 occur most frequently is in and near the auroral zone, and shifts depending on local time, poleward in the day-time and equatorward in the night-time.
A brief discussion is given on these results.
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