Automated region detection and sunspot analysis using GONG imagery

Details Automated region detection and sunspot analysis using GONG imagery Automated region detection and sunspot analysis using GONG imagery

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jphcs.271a2027g&link_type=abstract

Journal of Physics: Conference Series, Volume 271, Issue 1, pp. 012027 (2011).

Physics

Scientific paper

I describe the methods for automatically reporting magnetic regions from GONG magnetograms and sunspot area and extent from GONG white light images. The magnetic region detection involves the sun being gridded into small boxes and finding adjacent boxes that have significant field. The sunspot analysis uses gradient changes in the cumulative histogram to find dark pixels in a region. This is a variation on the method described by Pettauer and Brandt1. Both of the methods are reasonably simple to implement and have produced good results for regions in the early part of cycle 24. Automated Sunspot areas were plotted against USAF/NOAA daily sunspot areas for the whole disk and produced a correlation co-efficient of 0.89. Future work with GONG H-alpha imagery will be described briefly.

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