Derivation of the correction coefficient k in the relative sunspot number for a new sunspot observing system at Mitaka.

Details Derivation of the correction coefficient k in the relative sunspot number for a new sunspot observing system at Mitaka. Derivation of the correction coefficient k in the relative sunspot number for a new sunspot observing system at Mitaka.

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999rnaoj...4..149m&link_type=abstract

Rep. Natl. Astron. Obs. Jpn., Vol. 4, No. 3, p. 149 - 155

Astronomy and Astrophysics

Astronomy

Sunspot Numbers: Methods Of Reduction, Sunspot Numbers: Detectors

Scientific paper

A new sunspot observing system using a CCD of 2k×2k pixels has started at Mitaka, since April 1998. To determine the personal correction coefficient k in the formula for the relative sunspot number, the authors compared the sunspot numbers from the new system with those from conventional hand-drawing observations at their observatory and from S.I.D.C. (Sunspot Index Data Center). As a result, they obtained k = 1.0 on the average for the new system. There were, however, some cases in which the k-value largely deviates from the average.

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