Determination of CME 3D Trajectories From Stereoscopic Analysis of STEREO Coronagraph Data

Details Determination of CME 3D Trajectories From Stereoscopic Analysis of STEREO Coronagraph Data Determination of CME 3D Trajectories From Stereoscopic Analysis of STEREO Coronagraph Data

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13b1556l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH13B-1556

Physics

7513 Coronal Mass Ejections (2101), 7594 Instruments And Techniques, 7599 General Or Miscellaneous, 7924 Forecasting (2722)

Scientific paper

We present results demonstrating that the 3D trajectory (velocity and direction) of a CME can be determined from stereoscopic analysis of a series of simultaneous coronagraph image pairs from the STEREO A and B spacecraft. It has been demonstrated that stereoscopic analysis (aka triangulation) of bright coronal features such as loops can be used to determine their 3D location and geometry. In these cases, the emission from the feature comes from relatively localized volumes. This is not the case for bright features in white light images, which may capture scattered light from an extended volume. Even though line of sight (LOS) effects dominate the observed structure seen in white light coronagraph images of STEREO CMEs, we find that by "tiepointing" the bright leading edge of the CME in both images of a stereo pair, we are able to determine the 3D trajectory using stereoscopy. This technique has been validated previously using synthetic white light stereoscopic image pairs. Here, to validate our results, we compare our 3D trajectories with CME trajectories determined by a more sophisticated forward-modeling method developed by Thernisien et al (Ap. J. 2006).

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