Abstract
By combining data from the Nobeyama Radioheliograph and the LASCO coronagraph aboard the SoHO spacecraft, we report two helical coronal disturbances accompanying white-light coronal mass ejections (CMEs). These are activated prominences at the base, rotating around each vertical axis while moving on the solar surface with projected speeds of ≥50 km s-1. The activity continues in a CME core and in a neighboring streamer growing over 6 R☉. Neither flare activity nor radio bursts were observed during the two events. We suggest that the apparent presence or absence of a CME core depends on the density of the eruptive material associated with the CME.
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