Ca II K plage area dataset

Ca II K plage area series available to download from https://www2.mps.mpg.de/projects/sun-climate/data.html

The dataset shown here is the Chatzistergos et al., 2020 composite series combining data from 38 Ca II K observatories. The series was updated to the end of 2024.

Shown are montly mean values.

Figures generated by T.Chatzistergos on 30 July 2025.

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