Solar Cycle Studies Using Ca-K line Spectroheliograms and Line Profiles Obtained at Kodaikanal

Statistics – Methodology

Scientific paper

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1650 Solar Variability (7537), 7537 Solar And Stellar Variability (1650), 7538 Solar Irradiance

Scientific paper

We have obtained Ca-K line spectroheliograms of the sun since 1906 and have preserved in good conditions at Kodaikanal observatory. These were digitized using a scanner which permitted 8-bit read out. We have developed two digitizers using uniform light sources (1m Lab-sphere with 350 mm exit port), lenses for imaging the photographic plates with out vignetting of the image and 4k x 4k CCD cameras cooled to -100 C. The read out is at the rate 4 MHz with 16-bit read out. We have already started to digitize the images and expect to complete in about 2 years. In addition we have taken the Ca-K line profiles of the sun as a star since 1970 and Ca-K line profiles as a function of latitude integrated over the visible longitude since 1986. The Ca-K line profiles as a function of latitude have been used to study the variation of back ground flux with the solar cycle phase. Here we discuss methodology used to study the back ground flux using the Ca-K measured Ca-K plage areas from the spectroheliograms and the results obtained.

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