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Historical solar Ca II K observations at the Kyoto and Sacramento Peak observatories

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Chatzistergos,  Theodosios
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Krivova,  Natalie A.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Solanki,  Sami K.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Chatzistergos, T., Ermolli, I., Krivova, N. A., & Solanki, S. K. (2020). Historical solar Ca II K observations at the Kyoto and Sacramento Peak observatories. Journal of Physics: Conference Series, 1548(1): 012007. doi:10.1088/1742-6596/1548/1/012007.


Cite as: https://hdl.handle.net/21.11116/0000-0006-F510-3
Abstract
Archives of full-disc solar Ca II K observations covering even short periods of time can offer important data to fill observation gaps and to allow a better transition from historical to modern data. Two examples of such archives are those from the Kyoto and Sacramento Peak observatories. As most other historical Ca II K data, they suffer from artefacts that need to be accounted for to derive accurate plage areas. Here we present the results of our analysis of these archives of solar Ca II K images.