Comprehensive STEREO Observations of the 2008 February 4 CME

Thanks to the two Heliospheric Imagers that are part of STEREO's SECCHI instrument package, the two STEREO spacecraft are the first that are capable of following a CME continuously from the Sun all the way to 1 AU, where the PLASTIC and IMPACT instruments on the spacecraft can then also provide in situ information on the CME, assuming it hits one of the the two satellites. We present the first kinematic study of a CME that has been observed in such a comprehensive manner. The event begins on 2008 February 4 and is successfully tracked by STEREO-A to 1 AU where it hits STEREO-B on February 7. This is therefore a good example of STEREO's capability for one satellite (STEREO-A in this case) to observe a white-light CME front hitting the other satellite (STEREO-B in this case) at the same time as that second satellite is measuring the CME properties in situ.