抄録
Morphological studies on sudden commencements of magnetic storms are carried out using the data of rapid-run magnetograms during the IGY. The present paper contains two main parts; the first is an investigation of magnetic horizontal distrubance vectors of sudden commencements and the second is an analysis of corresponding partial equivalent current systems. Namely, horizontal disturbance vector diagrams of about 30 sudden commencements at nine stations, which are distributed in a half region of the northern hemisphere, are investigated. And in several cases, the corresponding possible equivalent current systems of DS-fields are obtained and discussed by drawing as consistent as possible with the horizontal disturbance vectors at every stations concerned.
