Research

Speaker: Dipankar Banerjee

Kodaikanal Observatory (KSO) has archived more than 100 years of solar images in three different wavelengths namely white light, Ca K and H-alpha. These have been captured through telescopes with unchanged optics, which ensured uniformity in image quality for several cycles. Four sets of data consists of while light photoheliograms since 1904, the Ca-K line spectroheliograms since 1906, H-alpha spectroheliograms since 1912 to 1998 and K-pr prominences spectroheliograms since 1912 to 1998. The butterfly diagrams as produced from these different datasets reveal new trends and features to understand the irregularities of solar cycle behaviors. While combining these archive along with other data sources from digitized archives and recent space based data integrated time series have been produced, which are allowing us to generate pseudo magnetograms.