Reconstructing the 3-D Trajectories of CMEs in the Inner Heliosphere

Details Reconstructing the 3-D Trajectories of CMEs in the Inner Heliosphere Reconstructing the 3-D Trajectories of CMEs in the Inner Heliosphere

2009-05-13

arxiv.org/abs/0905.2153v1

Solar Physics 256 (2009) 149-166

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

17 pages, 10 figures, 1 appendix

Scientific paper

10.1007/s11207-009-9364-3

A method for the full three-dimensional (3-D) reconstruction of the trajectories of coronal mass ejections (CMEs) using Solar TErrestrial RElations Observatory (STEREO) data is presented. Four CMEs that were simultaneously observed by the inner and outer coronagraphs (COR1 and 2) of the Ahead and Behind STEREO satellites were analysed. These observations were used to derive CME trajectories in 3-D out to ~15Rsun. The reconstructions using COR1/2 data support a radial propagation model. Assuming pseudo-radial propagation at large distances from the Sun (15-240Rsun), the CME positions were extrapolated into the Heliospheric Imager (HI) field-of-view. We estimated the CME velocities in the different fields-of-view. It was found that CMEs slower than the solar wind were accelerated, while CMEs faster than the solar wind were decelerated, with both tending to the solar wind velocity.

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