HIGHLIGHTS
- who: Chatzistergos Theodosios et al. from the INAF Osservatorio Astronomico di Roma, Via Frascati, Monte Porzio Catone, Italy School of Space Research, Kyung Hee University, Yongin, Gyeonggi, of Korea have published the research work: Analysis of full-disc Ca II K spectroheliograms - III. Plage area composite series covering 1892-2019, in the Journal: (JOURNAL) of 07/07/2000
- what: The authors provide the most complete so far time of areas based on corrected and calibrated historical and modern Ca II K images. To overcome these limitations, in the previous paper (Chatzistergos et_al 2018b, Paper I . . .
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