The Location of Solar Metric Type II Radio Bursts with Respect to the Associated Coronal Mass Ejections

Abstract

Forty-one solar type II radio bursts located close to the solar limb (projected radial distance r >~ 0.8 R _⊙) were observed at 109 MHz by the radioheliograph at the Gauribidanur observatory near Bangalore during the period 1997-2007. The positions of the bursts were compared with the estimated location of the leading edge (LE) of the associated coronal mass ejections (CMEs) close to the Sun. 38/41 of the type II bursts studied were located either at or above the LE of the associated CME. In the remaining 3/41 cases, the burst was located behind the LE of the associated CME at a distance of <0.5 R _⊙. Our results suggest that nearly all the metric type II bursts are driven by the CMEs.