448 citations · 2.8k across the 32 of their papers we have counts for
Showing 2017 · astro-ph.SRShow all
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astro-ph.SR2017★ 35 cited
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…
astro-ph.SR2017★ 107 cited
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…