Analysis of CME Trajectories using STEREO Heliospheric Imager Data

Details Analysis of CME Trajectories using STEREO Heliospheric Imager Data Analysis of CME Trajectories using STEREO Heliospheric Imager Data

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh43a..02l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH43A-02

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

We have previously demonstrated the determination of the 3D (velocity and direction) trajectory of CMEs using stereoscopic analysis of a series of simultaneous coronagraph image pairs from the STEREO A and B spacecraft. Here, we use these trajectory results, together with an analysis of the CME tracks as seen in STEREO’s Heliospheric Imagers, to study the propagation of CMEs beyond the coronagraph field-of-view. In particular, we want to use the Heliospheric Imager data to better understand when and why CME trajectories deviate from radial, constant velocity propagation beyond 0.1 AU. Because of the wide field-of-view of the imagers, if propagation is radial at a constant velocity, then there is a simple analytic relationship between the shape of a CME’s track in a elongation versus time plot (where elongation is the angle between the Sun and the CME front) and the direction and speed of the CME. We compare the track of the CME’s bright leading edge in the HI image with this analytic prediction using the speed and direction determined from the coronagraphs to study deviations from this constant-velocity, radial propagation assumption. Further analysis of the Heliospheric Imager data may also reveal the cause of any observed acceleration or deceleration. We will also describe the software developed for this analysis.

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