Analysis of the Velocity Field of CMEs Using Optical Flow Methods

Details Analysis of the Velocity Field of CMEs Using Optical Flow Methods Analysis of the Velocity Field of CMEs Using Optical Flow Methods

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2404c&link_type=abstract

American Astronomical Society, SPD meeting #37, #24.04; Bulletin of the American Astronomical Society, Vol. 38, p.251

Astronomy and Astrophysics

Astronomy

Scientific paper

Optical flow is a powerful image processing tool for measuring motion in digital images. The optical flow algorithm estimates a velocity vector at every image pixel from a pair of successive images. Here we present the application of this method on images of coronal mass ejections (CMEs). The technique is first tested and validated on a simulated CME. Then it is applied to several CMEs observed with the LASCO-C2 coronagraph to derive their velocity fields. The resulting velocity measurements allow us to separate the 'bulk' velocity from the expansion velocity of a given CME. To our knowledge, this is the first time that such information has been extracted from CME observations. We discuss the limitations and accuracy of our optical flow method and propose further improvements.

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