LASCO and EIT observations of helical structure in coronal mass ejections

Observations of coronal mass ejections (CMEs) by the Large Angle Spectromet ric Coronagraph (LASCO) on the Solar and Heliospheric Observatory (SOHO) sh ow a significant fraction with circular intensity patterns. In the past, th ese would have been called "disconnection" events, but we suggest that thes e are evidence of CMEs containing helical magnetic flux ropes that are ofte n central to many theoretical models of CMEs and have been observed in magn etic clouds near 1 AU. Three examples are examined in detail with the LASCO and Extreme-Ultraviolet Imaging Telescope (EIT) data sets, which provide o bservations from their initiation through 30 R..