THE MONITOR OF THE CME IN MARCH 1991 BY COSMIC RAYS
银河宇宙线对1991年3月日冕物质抛射的监测

By using the cosmic ray data observed at McMurdo, Thule and Guangzhou stations, the properties of the CME causing the severe magnetic storm on March 24 are studied. The results show that CME shifted to the earth's southern hemisphere when the CME passed the earth. There were three decreases in cosmic ray intensity when the CME reached the magnetosphere. There was a very strong magnetic structure in the CME and the strongest magnetic structure associated with the CME passed the earth at about 20:00UT, March 24, 1991.