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We present an analysis of coronal mass ejections (CMEs) observed by theHeliospheric Imagers (HIs) on board NASA's Solar Terrestrial RelationsObservatory (STEREO) spacecraft. Between August 2008 and April 2014 we identify273 CMEs that are observed simultaneously, by the HIs on both spacecraft. Foreach CME, we track the observed leading edge, as a function of time, from bothvantage points, and apply the Stereoscopic Self-Similar Expansion (SSSE)technique to infer their propagation throughout the inner heliosphere. Thetechnique is unable to accurately locate CMEs when their observed leading edgepasses between the spacecraft, however, we are able to successfully apply thetechnique to 151, most of which occur once the spacecraft separation angleexceeds 180 degrees, during solar maximum. We find that using a smallhalf-width to fit the CME can result in observed acceleration to unphysicallyhigh velocities and that using a larger half-width can fail to accuratelylocate the CMEs close to the Sun because the method does not account for CMEover-expansion in this region. Observed velocities from SSSE are found to agreewell with single-spacecraft (SSEF) analysis techniques applied to the sameevents. CME propagation directions derived from SSSE and SSEF analysis agreepoorly because of known limitations present in the latter. This work wascarried out as part of the EU FP7 HELCATS (Heliospheric Cataloguing, Analysisand Techniques Service) project (http://www.helcats-fp7.eu/).

solar physics

CMEs in the Heliosphere: III. A Statistical Analysis of the Kinematic  Properties Derived from Stereoscopic Geometrical Modelling Techniques Applied  to CMEs Detected in the Heliosphere from 2008 to 2014 by STEREO/HI-1