Open AccessHistorical solar Ca II K observations at the Kyoto and Sacramento Peak observatories
Author(s) -
Theodosios Chatzistergos,
I. Ermolli,
N. A. Krivova,
S. K. Solanki
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1548/1/012007
Subject(s) - meteorology , history , geography , environmental science , remote sensing
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.