THE VARIATIONAL PROPERTIES OF GALATIC COSMIC RAYS’ INTENSITIES OBSERVED AT GUANGZHOU STATION DURING JAN.7—10,1997

The paper presents the galactic cosmic rays intensities in vertical direction, south direction and north direction respectively observed by Guangzhou muon telescope (113°18'E, 23°6'N, 21m, 16 GV) before the January 1997 CME/magnetic cloud reached the earth. The enhancement in daily variation amplitude of galactic cosmic rays' intensity in vertical direction was obvious, while the north-south anisotropy was small. Based on standard transport theory and data observed in interplanetary space, the paper concludes that the enhancement of daily variation amplitude was due to the small angle between particle velocity direction and the magnetic force line, B ×▽n drift was another reason for enhanced daily variation amplitude. The small north-south anisotropy was mainly due to the fact that the B ×▽n drift with ▽n around 16 GV was small.