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New reconstruction of the sunspot group numbers since 1739 using direct calibration and “backbone” methods
Chatzistergos, Theodosios, Usoskin, Ilya G., Kovaltsov, Gennady A., Krivova, Natalie A., Solanki, Sami K.Volume:
602
Language:
english
Journal:
Astronomy & Astrophysics
DOI:
10.1051/0004-6361/201630045
Date:
June, 2017
File:
PDF, 1.14 MB
english, 2017