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HomeSolarSolar ConditionsMonthly Sunspot Numbers Friday, Jul 29 2016 01:59 UT
Solar Conditions

Monthly Sunspot Numbers

(last updated 01 Jul 2016 10:31 UT)

OBSERVED AND PREDICTED SOLAR INDICES Prepared by Bureau of Meteorology Space Weather Services Issued on 01 July 2016 -------------------------- SMOOTHED SUNSPOT NUMBER -------------------------- Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------- 2000 166.1 170.6 174.3 175.2 172.9 172.7 174.2 172.8 168.8 165.3 163.1 162.7 2001 158.3 152.5 155.1 160.7 163.7 167.4 172.0 175.8 177.1 177.3 180.3 179.1 2002 177.6 179.7 178.2 174.4 171.3 166.9 161.5 155.4 149.5 143.9 136.0 131.4 2003 129.6 125.7 118.7 111.9 107.0 101.7 96.0 92.9 91.8 89.1 86.9 84.1 2004 80.1 76.4 73.2 71.0 69.5 67.1 64.8 63.0 60.2 57.9 56.6 55.7 2005 54.5 53.2 52.3 49.3 45.0 44.5 44.6 41.9 39.4 38.9 38.4 36.0 2006 33.0 29.7 27.4 27.0 27.4 26.2 25.0 25.9 26.0 23.7 21.1 20.2 2007 19.8 19.0 17.7 16.4 14.4 12.8 11.6 9.9 9.6 9.9 9.2 7.9 2008 6.6 5.6 5.1 5.1 5.3 4.8 4.0 3.8 3.2 2.4 2.3 2.2 2009 2.5 2.7 2.9 3.3 3.5 4.1 5.5 7.4 9.5 10.9 11.7 12.7 2010 14.0 16.1 18.5 20.8 23.1 24.6 25.2 26.4 29.5 34.5 39.1 42.5 2011 45.7 48.8 53.8 61.1 69.3 77.2 83.6 86.3 86.6 87.4 89.4 92.5 2012 95.5 98.2 98.3 95.1 90.9 86.6 84.5 85.1 85.3 85.8 87.7 88.1 2013 86.8 86.1 84.4 84.3 87.0 90.9 94.6 99.0 104.7 107.0 106.9 107.6 2014 109.3 110.5 114.3 116.4 115.0 114.1 112.6 108.3 101.9 97.3 94.7 92.2 2015 89.3 86.1 82.2 78.9 76.1 72.1 68.3 66.4 66.0 64.4 61.4 57.9 2016 55.3e 53.8e 51.7e 49.5e 47.7e 46.1e 44.5e 42.8e 41.1e 40.1e 39.1e 38.7e 2017 37.5 35.8 34.7 33.6 32.4 30.9 29.3 27.7 26.4 25.5 24.9 24.4 2018 24.0 23.7 23.2 22.5 21.8 21.1 20.7 20.2 19.5 18.4 17.3 16.5 ============================================================================= -------------------- EQUIVALENT 10.7 CM SOLAR RADIO FLUX -------------------- Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ----------------------------------------------------------------------------- 2000 214.9 219.0 222.3 223.1 221.0 220.9 222.2 220.9 217.3 214.1 212.1 211.7 2001 207.6 202.0 204.5 209.8 212.6 216.1 220.2 223.6 224.7 224.9 227.5 226.5 2002 225.2 227.0 225.7 222.4 219.6 215.6 210.6 204.8 199.1 193.6 185.6 181.0 2003 179.2 175.2 168.0 161.1 156.0 150.6 144.8 141.7 140.6 137.9 135.7 133.0 2004 129.0 125.4 122.4 120.3 118.9 116.6 114.5 112.8 110.3 108.2 107.1 106.3 2005 105.2 104.1 103.3 100.7 97.1 96.7 96.8 94.6 92.6 92.2 91.8 90.0 2006 87.7 85.2 83.6 83.3 83.6 82.7 81.9 82.5 82.6 81.0 79.2 78.6 2007 78.4 77.8 77.0 76.2 74.9 74.0 73.3 72.3 72.1 72.3 71.9 71.1 2008 70.4 69.9 69.6 69.6 69.7 69.4 69.0 68.9 68.6 68.2 68.1 68.1 2009 68.2 68.3 68.5 68.7 68.8 69.1 69.8 70.9 72.0 72.8 73.3 73.9 2010 74.7 76.0 77.5 79.0 80.6 81.6 82.0 82.9 85.1 88.8 92.4 95.1 2011 97.7 100.3 104.6 111.1 118.7 126.2 132.5 135.1 135.4 136.2 138.2 141.3 2012 144.3 147.1 147.2 143.9 139.7 135.4 133.4 133.9 134.1 134.6 136.5 136.9 2013 135.6 134.9 133.3 133.2 135.8 139.7 143.4 147.9 153.7 156.0 155.9 156.7 2014 158.4 159.6 163.5 165.7 164.2 163.3 161.8 157.4 150.8 146.2 143.5 141.0 2015 138.1 134.9 131.1 127.9 125.2 121.3 117.7 116.0 115.6 114.1 111.4 108.2 2016 105.9e104.6e102.8e100.9e 99.4e 98.1e 96.7e 95.3e 94.0e 93.2e 92.4e 92.1e 2017 91.1 89.8 89.0 88.1 87.2 86.1 84.9 83.8 82.9 82.2 81.8 81.5 2018 81.2 81.0 80.6 80.2 79.7 79.2 79.0 78.6 78.2 77.5 76.8 76.2 ============================================================================= These tables are based on the observed (definitive and provisional) monthly mean sunspot numbers from WDC-SILSO, Royal Observatory of Belgium, Brussels (sidc.oma.be/silso/home). The observed values are smoothed using a 13 month running filter (the first and last values have half weighting). Estimated values have an "e" suffix and are calculated from observed monthly and predicted smoothed sunspot numbers. Observed smoothed values precede the estimated values while predicted smoothed values follow the estimated values. The 10.7 cm solar radio flux values, including the "observed" values, are obtained from sunspot numbers using a statistical conversion. They are therefore described as "equivalent" solar radio flux values. SPECIAL NOTE In June 2015, WDC-SILSO, Royal Observatory of Belgium, Brussels, adjusted their original observed sunspot numbers (Version 1.0) to a Version 2.0 series in which the sunspot numbers are higher. In the Version 1.0 data series, some of the sunspot numbers were weighted. The new (Version 2.0) sunspot numbers are unweighted sunspot number counts (for more information see: www.sidc.be/silso/home). The Bureau of Meteorology SWS solar cycle prediction is now based on the Version 2.0 values. As a result of the WDC-SILSO recalibration, the observed monthly sunspot numbers are higher. This is also reflected in the tables of smoothed sunspot numbers and equivalent 10.7 cm solar flux and the solar cycle graph. =============================================================================

(last updated 01 Jul 2016 10:31 UT)

OBSERVED MONTHLY SUNSPOT NUMBERS 1997 7.4 11.0 12.1 23.0 25.4 20.8 12.9 35.7 59.7 32.8 50.4 55.5 1998 44.5 50.2 82.0 70.6 74.0 90.5 96.7 121.1 132.0 78.5 97.3 119.2 1999 86.0 98.0 103.5 93.6 149.6 207.2 173.5 142.3 106.3 168.7 188.3 116.8 2000 133.1 165.7 217.7 191.5 165.9 188.0 244.3 180.5 156.0 141.6 158.1 143.3 2001 142.6 121.5 165.8 161.7 142.1 202.9 123.0 161.5 238.2 194.1 176.6 213.4 2002 184.6 170.2 147.1 186.9 187.5 128.8 161.0 175.6 187.9 151.2 147.2 135.3 2003 133.5 75.7 100.7 97.9 86.8 118.7 128.3 115.4 78.5 97.8 82.9 72.2 2004 60.6 74.6 74.8 59.2 72.8 66.5 83.8 69.7 48.8 74.2 70.1 28.9 2005 48.1 43.5 39.6 38.7 61.9 56.8 62.4 60.5 37.2 13.2 27.5 59.3 2006 20.9 5.7 17.3 50.3 37.2 24.5 22.2 20.8 23.7 14.9 35.7 22.3 2007 29.3 18.4 7.2 5.4 19.5 21.3 15.1 9.8 4.0 1.5 2.8 17.3 2008 4.1 2.9 15.5 3.6 4.6 5.2 0.6 0.3 1.2 4.2 6.6 1.0 2009 1.3 1.2 0.6 1.2 2.9 6.3 5.5 0.0 7.1 7.7 6.9 16.3 2010 19.5 28.5 24.0 10.4 13.9 18.8 25.2 29.6 36.4 33.6 34.4 24.5 2011 27.3 48.3 78.6 76.1 58.2 56.1 64.5 65.8 120.1 125.7 139.1 109.3 2012 94.4 47.8 86.6 85.9 96.5 92.0 100.1 94.8 93.7 76.5 87.6 56.8 2013 96.1 60.9 78.3 107.3 120.2 76.7 86.2 91.8 54.5 114.4 113.9 124.2 2014 117.0 146.1 128.7 112.5 112.5 102.9 100.2 106.9 130.0 90.0 103.6 112.9 2015 93.0 66.7 54.5 75.3 88.8 66.5 65.8 64.4 78.6 63.6 62.2 58.0 2016 56.6 57.2 54.9 38.0 52.1 20.9

Although the prediction of solar cycles is difficult, it has practical applications. For example, in planning High Frequency (HF) communication links it is important to estimate what frequencies will be supported by the ionosphere well into the future. Predictions of sunspot number are also very important in planning space-related activities particularly for low Earth orbiting spacecraft.

Subscribe to the Bureau of Meteorology SWS solar indices mailing list to receive monthly updates of the observed and predicted smoothed sunspot numbers.

Below is a graph of the current solar cycle: observed monthly sunspot number (thin yellow), observed smoothed monthly sunspot number (thick turquoise) and predicted smoothed monthly sunspot number (magenta crosses). Graphs of previous solar cycles can be found here.

Graph of Sunspot Numbers

(last updated 01 Jul 2016 10:31 UT)

SOLAR CYCLE FORECAST ------------------------------------------------------------------------------- Cycle Solar_Min Solar_Max Max_SSN Cycle_Length Min_to_Max Max_to_Min Year Mth Year Mth Years Mths Years Mths Years Mths ------------------------------------------------------------------------------- 24 2008 Dec 2014 Apr 116.4 10.7 128 5.3 64 5.3 64

A solar cycle viewing tool (zip file) is available for FTP download.

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