Abstract

This paper summarizes some recent results on coronal mass ejections (CMEs) obtained from the Solar Terrestrial Relations Observatory (STEREO) that relate to previous results from the Solar and Heliospheric Observatory (SOHO). Making use of the extended field of view of the STEREO instruments and the capability to view solar eruptions from vantage points away from the Sun-Earth line, this paper addresses CME morphology and the early evolution of CMEs including shock formation indicated by type II radio bursts and EUV disturbances. In situ observations from STEREO locations and Sun-Earth L1 are used to provide evidence to support the idea that all CMEs in the interplanetary medium may be flux ropes. Finally, the use of shock-flux rope morphology to determine the heliospheric magnetic field is discussed.