Solar activity lower in early-mid 1800’s: Strengthens case for Solar influence on climate

Tallbloke's Talkshop

Here’s a new paper which looks at the group and Wolff sunspot numbers in the mid C19th. The authors find the Wolff sunspot numbers (WSN) prior to 1848 are too high, and need reducing 20%. This brings the Wolff sunspot number more into line with Group Sunspot Number (GSN). The full paper is available (for a short time) directly from A&A here (free signup required).

Inconsistency of the Wolf sunspot number series around 1848

Raisa Leussu1,2, Ilya G. Usoskin1,2, Rainer Arlt3 and Kalevi Mursula1

1 Department of Physics, PO Box 3000, University of Oulu, 90014 Oulu, Finland
e-mail: Ilya.Usoskin@oulu.fi
2 Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, 90014 Oulu, Finland
3 Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany

Received: 26 July 2013
Accepted: 23 September 2013

Abstract

Aims. Sunspot numbers form a benchmark series in many studies, but may still contain inhomogeneities and inconsistencies…

View original post 213 more words

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