Development of automatic detection and reduction system for sunspots and faculae.

Details Development of automatic detection and reduction system for sunspots and faculae. Development of automatic detection and reduction system for sunspots and faculae.

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998rnaoj...4....1i&link_type=abstract

Rep. Natl. Astron. Obs. Jpn., Vol. 4, No. 1, p. 1 - 7

Astronomy and Astrophysics

Astronomy

Methods Of Reduction: Sunspots, Methods Of Reduction: Solar Faculae, Methods Of Observation: Solar Faculae, Methods Of Observation: Sunspots

Scientific paper

The authors describe an acquisition and data processing system of full-disk digitial solar images at the National Astronomical Observatory. The system aimes at an automated detection and data reduction of sunspots and faculae, and will replace the conventional hand drawing observation being continued since 1930's at the observatory. Full-disk digital images of the sun are taken and processed daily to provide automatic drawings of sunspots and faculae. The number and parameters of sunspots such as the position, area, and darkness are also derived. Data processing techniques used for the images are briefly described, which include the method of limb fitting, the production of solar contrast map by limb-darkening removal, and the detection of sunspots and faculae.

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