Historical sunspot numbers are about to be given an adjustment

Watts Up With That?

UPDATE: Some commenters got the wrong idea about this article, see the footnote.

monthly sunspots 1749 2014Our resident solar physicist Dr. Leif Svalgaard is one of the scientists involved in the effort

Dear SILSO user,

Mon, Jun 22, 2015 11:42 am

Over the past 4 years a community effort has been carried out to revise entirely the historical Sunspot Number series. A good overview of the analyses and identified corrections is provided in the recent review paper:
Clette, F., Svalgaard, L., Vaquero, J.M., Cliver, E. W.,“Revisiting the Sunspot Number. A 400-Year Perspective on the Solar Cycle”, Space Science Reviews, Volume 186, Issue 1-4, pp. 35-103.

Now that the new data series has been finalized, we are about to replace the original version of our sunspot data
by an entirely new data set on July 1st. On this occasion, we decided to simultaneously introduce changes in several conventions in the data themselves and also in the…

View original post 767 more words

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