Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7604f&link_type=abstract
American Astronomical Society Meeting 210, #76.04; Bulletin of the American Astronomical Society, Vol. 39, p.183
Other
Scientific paper
In this paper, we present a method to detect Emerging Flux Regions (EFRs) in consecutive Michelson Doppler Imager (MDI) magnetograms. The method includes several steps. First, the projection distortion on the MDI magnetograms is corrected. Second, the bipolar regions are extracted by applying multi-scale circular harmonic filters. Third, the extracted bipolar regions are traced in consecutive MDI frames by Kalman filter. Fourth, the properties, such as positive and negative magnetic fluxes and distance between two polarities, are measured in each frame. Then, a feature vector is constructed for each bipolar region using the measured properties. Finally, a classifier, such as SVM, is applied to distinguish EFRs from other regions. Experimental results show that the detection rate of EFRs is 96.4% and of non-EFRs is 98.0%, and the false alarm rate is 25.7%, based on all the available MDI magnetograms in 2001 and 2002.
Fu Gang
Shih Frank Y.
Wang Hai-Hong
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