On properties of radio-rich coronal mass ejections

Abstract

We have studied properties of the radio-rich coronal mass ejections (CMEs) (observed during 1997–2006) which produce type II (1–14 MHz) i.e. decametric–hectometric or DH radio burst. These DH CMEs are relatively faster and wider than the normal CMEs. The average speed and apparent width of these CMEs is 1048 km/s and 98°, respectively. Majority (about 54%) of DH CMEs decelerate, but about 21% show positive acceleration. The remaining 25% move with little acceleration. These special characteristics of radio-rich CMEs could be used to identify the population of geoeffective CMEs, which are quite relevant to space weather.