Extracting the apparent motion from two successive EIT images

Details Extracting the apparent motion from two successive EIT images Extracting the apparent motion from two successive EIT images

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..853g&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Physics

6

Eit, Differential Rotation, Motion Analysis, Optical Flow

Scientific paper

The EIT observations cover more than seven years of the 23rd solar cycle. The main synoptic dataset, usually refered to as the "CME Watch", is a nearly uninterrupted sequence of images taken in the Fe XII bandpass at a cadence of four images per hour. In this work we study motion tracking methods in order to estimate displacements from frame to frame. We have implemented a novel optical flow algorithm, and tested it on a couple of successive images. We have linked the apparent motion occurring between two frames to the expected rotation rate. On this short time scale (20 minutes), we are able to retrieve the global parameters of the solar differential rotation. A strategy for the extraction of region with reliable motion will be discussed.

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