Monday, April 29, 2013

1304.7132 (Gernot Riegler et al.)

Filament and Flare Detection in Hα image sequences    [PDF]

Gernot Riegler, Thomas Pock, Werner Pötzi, Astrid Veronig
Solar storms can have a major impact on the infrastructure of the earth. Some of the causing events are observable from ground in the H{\alpha} spectral line. In this paper we propose a new method for the simultaneous detection of flares and filaments in H{\alpha} image sequences. Therefore we perform several preprocessing steps to enhance and normalize the images. Based on the intensity values we segment the image by a variational approach. In a final postprecessing step we derive essential properties to classify the events and further demonstrate the performance by comparing our obtained results to the data annotated by an expert. The information produced by our method can be used for near real-time alerts and the statistical analysis of existing data by solar physicists.
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