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The potential of Ca II K observations for solar activity and variability studies

Published online by Cambridge University Press:  27 November 2018

Ilaria Ermolli Open the ORCID record for Ilaria Ermolli [Opens in a new window] ,
Theodosios Chatzistergos Open the ORCID record for Theodosios Chatzistergos [Opens in a new window] ,
Natalie A. Krivova  and
Sami K. Solanki
Ilaria Ermolli
Affiliation:
INAF – Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy
Theodosios Chatzistergos
Affiliation:
INAF – Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany
Natalie A. Krivova
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany
Sami K. Solanki
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany School of Space Research, Kyung Hee University, Republic of Korea
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Abstract

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Several observatories around the globe started regular full-disc imaging of the solar atmosphere in the Ca II K line in the early decades of the 20th century. These observations are continued today at a few sites with either old spectroheliographs or modern telescopes equipped with narrow-band filters. The Ca II K time series are unique in representing long-term variations of the Sun’s chromospheric magnetic field. However, meaningful results from their analysis require accurate processing of the available data and robust merging of the information stored in different archives. This paper provides an overview of the historical and modern full-disc Ca II K observations, with focus on their quality and the main results obtained from their analysis over the last decade.

Keywords

Sun: activityplagesSun: chromosphereSun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S340: Long-term Datasets for the Understanding of Solar and Stellar Magnetic Cycles , February 2018 , pp. 115 - 120
Copyright
Copyright © International Astronomical Union 2018 

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