An Experimental Wolf Numbers Index (Abstract)

Volume 31 number 2 (2003)

Casper H. Hossfield

Thomas Flemming

Abstract

(Abstract only) The purpose of this experiment is to see how Wolf number sunspot counts compare over time with modern Zurich number sunspot counts. Six AAVSO sunspot observers made Wolf number sunspot counts using Wolf’s system of counting as defined in Waldmeier’s introduction to his book (Waldmeier, 1962). Nine AAVSO sunspot observers made sunspot counts according to the Zurich system of counting also described by Waldmeier in his book. The two sets of data are compared graphically for the period September 2001 through September 2002.