Radio imaging of coronal mass ejection related phenomena

Dalmiro Maia

Multifrequency radio observations of the solar corona in the metric domain provide diagnostics of a wide variety of phenomena that occur in association with coronal mass ejections (CMEs). Radio imaging instruments can follow the processes leading to CME initiation, follow the expansion of the CME in the low corona, both on disk, and above the solar limb, and as such make the link with coronagraphic data. For flare-CME events, the evolution takes place low in the corona and is extremely fast, on the order of a few minutes, and encompasses most of therange in latitude of the mass ejection seen by white light coronagraphs. The characteristic signatures of the many CME related phenomena go from thermal emission of the eruptive cavity in the low corona, to direct imaging of the CME loops from synchrotron emission, to radio continua and type II like emissions. Recent progress on the understanding of the early development of CMEs, and on the coronal restructuring in the aftermath of the mass ejection, based on solar radio imaging, is reviewed here.