New reconstruction of the sunspot group numbers since 1739 using direct calibration and “backbone” methods⋆

Author： Chatzistergos Theodosios   Usoskin Ilya G.   Kovaltsov Gennady A.   Krivova Natalie A.   Solanki Sami K.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|602|issue|A69-A69

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.602, Iss.issue, 2017-06, pp. : A69-A69

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