Characteristics of CMEs associated with solar flares and DH type II radio bursts based on source position

摘要

We studied the characteristics of Coronal Mass Ejections (CMEs) associated with solar flares and Deca-Hectometric (DH) type II radio bursts, based on source position during 23rd solar cycle (1997-2007). We classified these CME events into three groups using solar flare locations as, (i) disk events (0-30°); (ii) intermediate events (31-60°) and (iii) limb events (61-90°). Main results from this studies are, (i) the number of CMEs associated with solar flares and DH-type IIs decreases as the source position approaches from disk to limb, (ii) most of the DH CMEs are halo (72%) in disk events and the number of occurrence of halo CMEs decreases from disk to limb, (iii) the average width and speed of limb events (164° and 1447 km s ~(-1)) are higher than those of disk events (134° and 1035 km s ~(-1)) and intermediate events (146° and 1170 km s ~(-1)) and (iv) the average accelerations for disk, intermediate and limb events are -8.2 ms ~(-2), -10.3 ms ~(-2) and -4.5 ms ~(-2) respectively. These analysis of CMEs properties show more dependency on longitude and it gives strong evidence for projection effect.