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Century long study of sunspot activity using the Kodaikanal white-light data

Published online by Cambridge University Press:  27 November 2018

K. Amareswari
Affiliation:
ISRO Satellite Centre, Bengaluru - 560017, India. email: [email protected]
K. Sankarasubramanian
Affiliation:
ISRO Satellite Centre, Bengaluru - 560017, India. email: [email protected]
B. Ravindra
Affiliation:
Indian Institute of Astrophysics, Bengaluru - 560034, India.
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Abstract

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Sunspots are the most obvious and high contrast observable feature of solar magnetic activity in the photosphere. The morphological and kinematic behavior of sunspots on the solar surface need to be studied over a long time period to understand solar magnetic activity. For this, it is important to understand the long term emergence patterns, and developments, decay of the sunspots on the solar surface over many cycles. The long time sequence of the Kodaikanal white-light images provide a consistent data set for this study. The digitized images were calibrated for relative plate density and aligned in such a way that the solar north is in upward direction. A sunspot detection technique was used to identify the sunspots on the digitized images. In addition to describing the calibration procedure and availability of the data, we here present results on the sunspot, umbral and penumbral area measurements and their variation with time.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

Hathaway, D. H., 2013, Solar Phys., 286, 347Google Scholar
Ravindra, B., Priya, T. G., Amareswari, K., Priyal, M., Nazia, A. A., & Banerjee, D., 2013, A&A., 550, 19Google Scholar