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

Published 10 May 2018 in astro-ph.SR | (1805.03928v1)

Abstract: 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.

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