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Mark 4, COR1/STEREO and LASCO/SOHO data analysis shows that at least aportion of type II radio bursts observed in the corona occurs in the presenceof a CME, but in the absence of a shock ahead of them. A drift currentinstability in the CME frontal structure is discussed as a possible cause ofsuch bursts.

A formation mechanism for the type II radio emission in the solar corona unrelated to shock waves