Sunspot numbers obtained by different networks in 1996 ====================================================== SIDC SONNE SONNE AAVSO AKS BAA GFOES OAA RWS TOS VVS prov. prov. def. (D) (GB) (F) (JAP) (CH) (PL) (B) Jan. 12.0 8.8 8.4 10.9 10.0 11.8 8.7 10.1 9.7 8.3 16.5 Feb. 4.4 4.0 3.8 5.9 5.7 5.5 4.5 5.2 4.8 3.8 4.3 March 9.2 8.6 8.3 8.3 7.6 9.8 9.8 8.9 8.0 9.6 9.9 April 5.1 3.9 3.8 5.4 4.3 5.7 3.6 4.5 4.6 6.1 3.4 May 5.6 5.3 5.5 6.3 2.4 6.3 5.7 6.5 5.5 7.1 5.3 June 11.8 11.1 11.4 11.6 14.9 14.7 12.6 12.2 13.0 14.2 12.8 July 8.8 7.3 7.5 8.1 7.4 10.0 8.6 8.1 9.3 8.7 8.7 Aug. 14.0 12.6 12.5 13.2 14.6 15.3 14.7 13.7 14.2 15.7 14.6 Sep. 1.8 1.2 1.2 1.8 2.0 2.1 1.5 1.9 1.4 1.5 1.8 Oct. 1.8 0.2 0.1 1.4 0.0 1.2 0.1 0.6 0.0 0.4 0.1 Nov. 18.6 15.5 14.8 16.1 11.9 18.8 15.6 16.8 15.9 20.9 19.2 Dec. 12.7 10.2 10.4 12.0 11.1 11.8 9.0 12.1 11.4 12.4 10.6 SIDC: Sunspot Index Data Center, Brussels (international sunspot numbers) SONNE prov.: SONNE network, provisional sunspot numbers SONNE def.: SONNE network, definitive sunspot numbers AAVSO: American Association of Variable Star Observers - Solar Division AKS: Arbeitskreis Sonne des Kulturbundes e.V., Germany BAA: The British Astronomical Association - Solar Section GFOES: Commission "Nombre de Wolf", France OAA: The Oriental Astronomical Association - Solar Division, Japan RWS: Rudolf Wolf Society - Solar Observer Group of Swiss Astron. Society TOS: Towarzystwo Obserwatorow Slonca - Solar Observers Society, Poland VVS: Solar Section, Belgium