On the hierarchical relationship between type II radio bursts and the associated coronal mass ejections

Abstract

Abstract Using type II radio bursts from Wind/WAVES and the associated coronal mass ejections (CMEs) from SOHO/LASCO, Gopalswamy et al. (2005) found a hierarchical relationship between the wavelength range of the type II bursts and CME kinetic energy. Under ‘DH (Decametric-Hectometric) Type II bursts’, they have included m (metric)-DH, pure DH and DH-km bursts. In this work, we consider the pure DH, m-DH and DH-km (kilometric) subsets separately. We find that CMEs associated with DH-km type II bursts have the largest values of average speed, non-halo width, mass, and halo fraction. CMEs associated with m-DH type II bursts have a slightly larger average speed and mass than those causing pure DH type II bursts. CMEs associated with m-DH and pure DH type II bursts have slightly a lower speed and halo fraction compared to those associated with the combined set of DH type II bursts in Gopalswamy et al. (2005), while CMEs causing the DH-km type II bursts have even larger values of CME parameters. DH-km type II burst associated CMEs have the largest solar energetic particles (SEPs) association compared to m-DH and pure DH type II burst associated CMEs. The DH-km type II burst associated CMEs SEP association is slightly smaller than that of Gopalswamy et al. (2005) m-km type II burst associated CMEs. The CMEs associated with major SEP have a larger average speed than the pure DH and m-DH CMEs but smaller than the DH-km CMEs.