Sunspot and group number datasets

 

 

Sunspot number series available to download https://www.sidc.be/SILSO/datafiles

Group sunspot number series available to download https://www2.mps.mpg.de/projects/sun-climate/data.html

 

The datasets shown here are the International Sunspot number series version 2 (ISNv2; Clette et al. 2023) and the Chatzistergos et al., 2017, group sunspot number series.

 

Shown are montly mean values.

 

ISNv2 plot

 

CEA17 GSN plot

Figures generated by T.Chatzistergos on 30 July 2025.

 

Back to the main page