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Ca II K spectroheliograms for studies of long-term changes in solar irradiance

Published online by Cambridge University Press:  27 November 2018

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

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We address the importance of historical full-disc Ca II K spectroheliograms for solar activity and irradiance reconstruction studies. We review our work on processing such data to enable them to be used in irradiance reconstructions. We also present our preliminary estimates of the plage areas from five of the longest available historical Ca II K archives.

Keywords

Sun: activitySun: chromosphereSun: faculaeplages
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. 125 - 128
Copyright
Copyright © International Astronomical Union 2018 

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