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HomeEducationalThe Sun and Solar ActivitySolar CycleYearly Mean Sunspot Numbers Sunday, Nov 23 2014 00:48 UT
The Sun and Solar Activity

Yearly Mean Sunspot Numbers

IPS is often asked about historical sunspot numbers. The table below, available from the National Geophysical Data Center in Boulder (USA), lists the yearly values of sunspot number from 1700 to 1995.

MAX marks a sunspot cycle maximum and min a minimum. Up to 1944, yearly means were calculated as the average of the 12 monthly means; since 1945 yearly means have been calculated as the average of the daily means.

Year Sunspot number Year Sunspot number Year Sunspot number Year Sunspot number Year Sunspot number
17005
170111176185.9 MAX18216.6188154.3194147.5
170216176261.218224.0188259.7194230.6
170323176345.118231.8 min188363.7 MAX194316.3
170436176436.418248.5188463.519449.6 min
170558 MAX176520.9182516.6188552.2194533.2
170629176611.4 min182636.3188625.4194692.6
170720176737.8182749.6188713.11947151.6 MAX
170810176869.8182864.218886.81948136.3
170981769106.1 MAX182967.018896.3 min1949134.7
171031770100.8183070.9 MAX18907.1195083.9
17110177181.6183147.8189135.6195169.4
17120 min177266.5183227.5189273.0195231.5
17132177334.818338.5 min189385.1 MAX195313.9
171411177430.6183413.2189478.019544.4 min
17152717757.0 min183556.9189564.0195538.0
171647177619.81836121.5189641.81956141.7
171763 MAX177792.51837138.3 MAX189726.21957190.2 MAX
1718601778154.4 MAX1838103.2189826.71958184.8
1719391779125.9183985.7189912.11959159.0
172028178084.8184064.619009.51960112.3
172126178168.1184136.719012.7 min196153.9
172222178238.5184224.219025.0196237.6
172311 min178322.8184310.7 min190324.4196327.9
172421178410.2 min184415.0190442.0196410.2 min
172540178524.1184540.1190563.5 MAX196515.1
172678178682.9184661.5190653.8196647.0
1727122 MAX1787132.0 MAX184798.5190762.0196793.8
17281031788130.91848124.7 MAX190848.51968105.9 MAX
1729731789118.1184996.3190943.91969105.5
173047179089.9185066.6191018.61970104.5
173135179166.6185164.519115.7197166.6
173211179260.0185254.119123.6197268.9
17335 min179346.9185339.019131.4 min197338.0
173416179441.0185420.619149.6197434.5
173534179521.318556.7191547.4197515.5
173670179616.018564.3 min191657.1197612.6 min
17378117976.4185722.71917103.9 MAX197727.5
1738111 MAX17984.1 min185854.8191880.6197892.5
173910117996.8185993.8191963.61979155.4 MAX
174073180014.5186095.8 MAX192037.61980154.6
174140180134.0186177.2192126.11981140.4
174220180245.0186259.1192214.21982115.9
174316180343.1186344.019235.8 min198366.6
17445 min180447.5 MAX186447.0192416.7198445.9
174511180542.2186530.5192544.3198517.9
174622180628.1186616.3192663.9198613.4 min
174740180710.118677.3 min192769.0198729.4
17486018088.1186837.6192877.8 MAX1988100.2
174980.918092.5186974.0192964.91989157.6 MAX
175083.4 MAX18100.0 min1870139.0 MAX193035.71990142.2
175147.718111.41871111.2193121.21991145.8
175247.818125.01872101.6193211.1199294.5
175330.7181312.2187366.219335.7 min199354.7
175412.2181413.9187444.719348.7199429.9
17559.6 min181535.4187517.0193536.1199517.9
175610.2181645.8 MAX187611.3193679.7
175732.4181741.1187712.41937114.4 MAX
175847.6181830.118783.4 min1938109.6
175954.0181923.918796.0193988.8
176062.9182015.6188032.3194067.8

Material prepared by Richard Thompson

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