Correlation of interplanetary medium parameters in transition region of high-velocity solar wind streams

Investigations of variations in the intensity of galactic cosmic rays (GCR) during presence of the Earth in high velocity streams (HVS) of the solar wind which are associated with coronal holes have shown that the structure of HVS and characteristics of the medium exert a considerable influence on the distribution of cosmic rays in the interplanetary medium. The transition region between the quiet solar wind and HVS, where a significant anisotropy of cosmic rays arises, is of considerable importance. These phenomena were studied using data from the King catalogue for the period 1973-1974 (declining solar activity) when there was a great number of HVS, of which 62 with a velocity 500-800 km/sec were selected for analysis. This made it possible to obtain a number of relationships between the parameters of the streams. It was discovered that there is a close correlation between the transverse dimensions of the HVS and the maximum velocity of plasma in the stream. This agrees well with the known correlation between the dimensions of coronal holes and the velocity of HVS if it is assumed that the size of the coronal hole and the width of the HVS are closely correlated.