Propagation Directions and Kinematics of STEREO CME/ICMEs Events

Astronomy and Astrophysics – Astrophysics

Scientific paper

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[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7900] Space Weather

Scientific paper

The Heliospheric Imagers on board the two STEREO twin satellites give us the possibilities to track Coronal Mass Ejections up to a distance of 1 AU. For events of our interest, remote sensing data as well as in situ measurements from the other STEREO spacecraft or Wind are available. The combination of both allows us to calculate a constant propagation direction in the ecliptic plane by using different methods (Fixed-Phi and the Harmonic Mean). These methods convert the measured elongation into distance by making different assumptions on the shape of the CME. With the combined data sets we can also derive the kinematics (distance-velocity plots) and try to crosscheck the results by taking care of the ambient solar wind. Moreover, we use inverse fitting methods for both the Fixed-Phi and Harmonic Mean approaches (which assume constant velocity) to fit our measurements and compare it to the results calculated by our combined method.

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