Ca II K spectroheliograms for studies of long-term changes in solar irradiance
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova, Sami K., Solanki
TL;DR
This paper discusses the significance of historical Ca II K spectroheliograms for understanding long-term solar irradiance variations, reviews data processing methods, and presents preliminary plage area estimates from extensive archives.
Contribution
It introduces data processing techniques for historical spectroheliograms and provides initial plage area measurements from long-term archives.
Findings
Processed historical data for irradiance studies
Preliminary plage area estimates from archives
Highlighting the importance of historical data for solar research
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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