Sunspot numbers obtained by different networks in 2001 ====================================================== SIDC SONNE SONNE AAVSO AKS BAA GFOES GSRSI OAA RWG TOS VVS prov. prov. def. prov. (D) (GB) (F) (I) (J) (CH) (PL) (B) Jan 95.1 99.4 96.8 131.8 97.2 111.5 110.7 130.2 113.0 115.1 114.5 122.1 Feb 80.1 85.6 83.1 106.9 75.9 90.8 103.3 113.8 95.4 96.8 99.1 103.4 Mar 114.2 116.1 115.5 147.4 99.5 123.4 126.7 157.0 128.6 137.7 133.4 150.7 Apr 108.2 112.7 112.4 141.1 113.3 122.3 121.7 156.4 132.9 128.4 123.8 142.6 May 97.3 100.7 100.0 125.0 102.9 107.1 106.2 146.6 109.7 108.3 116.9 126.7 Jun 134.0 141.2 143.5 182.4 139.6 149.5 149.2 204.9 155.8 164.3 160.2 183.1 Jul 82.2 83.9 84.5 107.2 81.3 91.4 90.2 126.8 94.8 96.8 92.1 107.6 Aug 106.8 115.6 114.0 144.9 108.1 121.6 119.6 177.1 122.3 158.9 129.5 140.0 Sep 150.7 167.9 165.9 217.6 163.9 176.3 168.5 246.3 190.5 192.5 188.6 211.9 Oct 125.6 137.8 135.9 176.4 143.3 145.9 145.8 222.4 149.7 154.2 157.8 170.2 Nov 106.5 117.4 117.5 157.4 130.2 133.0 116.0 175.1 142.5 140.6 136.4 143.4 Dec 131.8 146.9 142.3 191.4 149.8 161.2 139.6 213.3 173.2 167.0 164.4 184.3 SIDC: Solar Influences Data Analysis 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, UK GFOES: G.F.O.E.S. Commission "Nombre de Wolf", France GSRSI: GruppoSole Ricerce Solari Italia, Italy OAA: The Oriental Astronomical Association - Solar Division, Japan RWG: Rudolf Wolf Gesellschaft - Solar Obs. Group of Swiss Astron. Society TOS: Towarzystwo Obserwatorow Slonca - Solar Observers Society, Poland VVS: Vereniging voor Sterrenkunde, Werkgroep Zon, Belgium