Solar coronal mass ejection trajectories estimated from STEREO Heliospheric Imager data compared with established techniques and in situ data

Details Solar coronal mass ejection trajectories estimated from STEREO Heliospheric Imager data compared with established techniques and in situ data Solar coronal mass ejection trajectories estimated from STEREO Heliospheric Imager data compared with established techniques and in situ data

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41a1634d&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41A-1634

Astronomy and Astrophysics

Astrophysics

[2101] Interplanetary Physics / Coronal Mass Ejections, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7594] Solar Physics, Astrophysics, And Astronomy / Instruments And Techniques, [7924] Space Weather / Forecasting

Scientific paper

The Heliospheric Imagers (HIs) of the NASA STEREO mission contain wide-field cameras that image the region of the heloisphere between the Sun and the Earth. Their primary science goal is to image Earth-directed coronal mass ejections (CMEs) and track their progress through the heliosphere to Earth. While CMEs are considered to be travelling at a constant velocity through the HI field of view, the wide-field nature of the cameras results in an apparent acceleration of the CME that is a function of the CME trajectory. Fitting this function to the apparent acceleration provides an estimate of the speed and direction of a CME. This technique has been shown to work for several isolated cases where the CME passed over a planet or spacecraft but until now, no study has been made of the validity of the technique in comparison with others. We present the results of such a comparison and show that there is good agreement between independent estimates of CME velocities.

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