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We present an analysis of the fast coronal mass ejection (CME) of 2012 March7, which was imaged by both STEREO spacecraft and observed in situ byMESSENGER, Venus Express, Wind and Mars Express. Based on detected arrivals atfour different positions in interplanetary space, it was possible to stronglyconstrain the kinematics and the shape of the ejection. Using the white-lightheliospheric imagery from STEREO-A and B, we derived two different kinematicalprofiles for the CME by applying the novel constrained self-similar expansionmethod. In addition, we used a drag-based model to investigate the influence ofthe ambient solar wind on the CME's propagation. We found that two precedingCMEs heading in different directions disturbed the overall shape of the CME andinfluenced its propagation behavior. While the Venus-directed segment underwenta gradual deceleration (from ~2700 km/s at 15 R_sun to ~1500 km/s at 154R_sun), the Earth-directed part showed an abrupt retardation below 35 R_sun(from ~1700 to ~900 km/s). After that, it was propagating with a quasi-constantspeed in the wake of a preceding event. Our results highlight the importance ofstudies concerning the unequal evolution of CMEs. Forecasting can only beimproved if conditions in the solar wind are properly taken into account and ifattention is also paid to large events preceding the one being studied.

Combined Multipoint Remote and In Situ Observations of the Asymmetric Evolution of a Fast Solar Coronal Mass Ejection