VizieR Online Data Catalog: Sunspot on 1904-2017 (Jha+, 2022)

Regular observations at the Kodaikanal observatory began in 1904 using a white-light telescope with a 10-cm aperture lens and a f/15 light beam. Between 1912 and 1917, the objective lens was changed several times and in 1918, a 15-cm achromatic lens was installed. This newconfiguration produced a 20.4cm size image of the Sun in the imageplane. Photographic plates were used to capture the image. The same telescope has been used since 1918 up until 2011 to take regular white-light observation of the sun.

We present observations from 1904 to 2017.

For quarries, contact Dipankar Banerjee (dipu(at)iiap.res.in)

(1 data file).