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Comment on the paper by Popova et al. "On a role of quadruple component of magnetic field in defining solar activity in grand cycles"
Ilya G. Usoskin
The paper by Popova et al. presents an oversimplified mathematical model of solar activity with a claim of predicting/postdicting it for several millennia ahead/backwards. The work…
Updated sunspot group number reconstruction for 1749-1996 using the active day fraction method
Teemu Willamo, Ilya G. Usoskin, Gennady A. Kovaltsov
Sunspot number series are composed from observations of hundreds of different observers that requires careful normalization of the observers to the standard conditions. Here we pre…
New reconstruction of the sunspot group number since 1739 using the direct calibration and "backbone" methods
Theodosios Chatzistergos, Ilya G. Usoskin, Gennady A. Kovaltsov +2
Group sunspot number (GSN) series constitute the longest instrumental astronomical database providing information on solar activity. It is a compilation of observations by many ind…