How Well Do We Know the Sunspot Number?

نویسنده

  • Leif Svalgaard
چکیده

We show that only two adjustments are necessary to harmonize the Group Sunspot Number with the Zürich Sunspot Number. The latter being inflated from the 1940s on to the present by 20% due to weighting of sunspot counts according to size of the spots, and corrected by inflating the earlier values as well. The Group Sunspot Number before ∼1885 is too low by ∼50%. With these adjustments a single sunspot number series results. Of note is that there is no longer a distinct Modern Grand Maximum.

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تاریخ انتشار 2011