Article ID Journal Published Year Pages File Type
1763762 Advances in Space Research 2014 4 Pages PDF
Abstract

We have studied the relationship between three different versions of the sunspot number (Group, International and American Sunspot Number) and the number of active days (i.e., the number of days with spots on the solar disk). We have detected an approximately linear relationship for low solar activity conditions. However, this relationship for the International Sunspot Number is very different to the ones obtained with the other versions of the sunspot number. The discordant values correspond to older observations.

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Physical Sciences and Engineering Earth and Planetary Sciences Space and Planetary Science
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