Sunspot numbers obtained by different networks in 1998 ====================================================== SIDC SONNE SONNE AAVSO AKS BAA GFOES GSI OAA RWG TOS VVS prov. prov. def. prov. (D) (GB) (F) (I) (JAP) (CH) (PL) (B) Jan 32.3 25.9 28.3 34.3 30.8 39.0 26.2 37.8 32.5 30.8 36.7 35.5 Feb 40.7 33.1 32.4 41.9 32.5 41.2 34.2 43.5 36.8 35.9 42.6 37.7 Mar 54.8 54.0 54.4 66.1 45.4 61.8 53.2 64.7 64.4 61.7 59.7 65.8 Apr 53.3 45.3 44.9 55.6 53.1 57.4 42.9 55.6 54.3 46.9 50.1 55.2 May 56.9 48.3 49.3 59.3 55.8 56.1 49.4 56.6 54.7 53.9 60.1 60.5 Jun 70.5 61.6 60.9 73.9 65.1 70.7 64.3 74.7 68.0 66.3 75.8 72.5 Jul 66.2 62.1 63.5 77.1 49.0 71.7 66.1 76.5 68.7 69.9 78.6 78.0 Aug 91.7 81.7 83.0 101.9 88.2 92.8 83.4 101.6 92.1 92.7 96.9 100.2 Sep 92.9 86.9 88.1 111.0 96.6 98.9 92.6 107.8 99.0 101.1 105.1 106.5 Oct 55.6 45.5 48.2 63.0 59.2 56.0 51.6 61.0 55.4 57.8 62.6 67.8 Nov 73.6 62.1 65.3 85.2 67.6 74.9 65.9 80.6 79.0 74.6 76.9 77.2 Dec 81.6 81.2 80.3 99.5 85.2 86.7 83.4 . 99.8 75.0 88.7 93.2 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, UK GFOES: G.F.O.E.S. Commission "Nombre de Wolf", France GSI: Gruppo Sole 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