Coronal Mass Ejections, Polar Crown Filaments, and Cosmic Ray Modulation 1979-1989 Cliver, E. W. ; St. Cyr, O. C. ; Howard, R. A. ; McIntosh, P. S. Abstract Publication: 23rd International Cosmic Ray Conference (ICRC23), Volume 3 Pub Date: 1993 Bibcode: 1993ICRC....3..517C