Sunspot numbers obtained by different networks in 2005 ====================================================== 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 31.3 31.9 31.9 44.1 . 37.8 32.2 46.0 40.9 40.1 44.2 39.8 Feb 29.1 30.6 30.0 39.3 . 33.6 28.7 52.6 37.8 36.7 42.3 37.2 Mar 24.8 26.6 26.1 33.9 . 28.7 26.8 43.7 29.4 32.6 35.0 35.8 Apr 24.4 27.4 26.5 34.8 . 29.3 24.1 45.4 32.0 32.6 36.1 34.4 May 42.6 43.9 42.5 56.2 . 45.1 39.9 71.3 50.4 52.9 53.5 53.1 Jun 39.3 40.0 39.6 53.7 . 44.0 39.2 64.2 42.7 51.5 52.2 52.4 Jul 39.9 45.0 44.9 57.2 . 50.5 43.1 71.6 49.5 57.7 57.1 58.7 Aug 36.4 40.4 40.8 52.4 . 47.3 39.6 67.6 47.7 49.4 52.6 55.5 Sep 22.1 24.7 24.4 33.6 . 28.1 22.7 41.1 30.1 30.9 30.7 33.4 Oct 8.5 8.3 8.3 12.4 . 9.7 6.8 13.6 11.9 10.4 12.0 12.2 Nov 18.0 18.5 18.6 26.2 . 22.4 21.1 29.4 23.8 29.9 27.8 24.7 Dec 41.2 39.8 40.2 53.3 . 48.3 45.8 55.0 47.1 47.2 56.0 55.0 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