IPS OBSERVED AND PREDICTED SOLAR INDICES
Prepared and Copyright by IPS Radio and Space Services Australia

Issued on January 1st 2025                          
                                                                             
-------------------------- SMOOTHED SUNSPOT NUMBER --------------------------
Year   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec 
-----------------------------------------------------------------------------
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  65.9  64.3  61.2  57.8 
2016  54.4  52.5  50.4  47.8  44.8  41.5  38.5  36.0  33.2  31.5  29.9  28.5 
2017  27.8  26.5  25.7  24.8  23.3  22.2  21.0  19.6  18.3  16.7  15.4  15.0 
2018  14.2  12.6   9.9   7.8   7.5   7.2   7.0   6.7   6.5   6.8   6.7   6.0 
2019   5.4   5.0   4.5   4.3   3.9   3.7   3.5   3.4   3.1   2.6   2.0   1.8 
2020   2.2   2.7   3.0   3.6   5.6   7.9   9.0   9.5  10.5  11.9  13.6  15.3 
2021  17.2  19.0  21.7  24.8  25.8  27.6  31.4  35.4  40.2  45.2  50.8  55.9 
2022  60.1  64.7  68.7  73.0  77.4  81.1  86.7  92.6  96.5  99.0 101.2 106.7 
2023 113.3 117.8 121.1 122.9 124.2 125.3 124.6 124.3 124.0 124.8 127.9 129.5 
2024 131.1 136.9 141.3 144.4 149.1 152.7 155.0e156.3e158.3e159.7e158.1e155.1e
2025 151.0e144.7e140.7e138.8e136.2e134.0e130.3 130.5 130.7 129.9 127.8 124.9 
2026 122.1 120.6 119.9 118.5 116.7 115.2 113.1 109.6 105.5 101.4  97.9  95.2 
2027  92.8  89.4  84.7  80.3  77.2  74.2  71.5  69.3  66.4  63.3  61.4  59.8 
2028  57.6  55.9  55.5  55.0  53.2  50.8  48.5  46.4  44.7  42.8  40.5  38.9 
2029  37.7  35.9  33.5  31.3  29.6  28.6  27.9  27.0  26.1  25.4  24.7  23.8 
2030  22.9  22.1  21.3  20.3  19.0  17.6  16.4  15.7  14.9  14.3  13.9  13.5 
=============================================================================
                                                                             
--------------------- SMOOTHED 10.7 CM SOLAR RADIO FLUX ---------------------
Year   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec 
-----------------------------------------------------------------------------
2006  86.1  84.2  82.1  80.7  80.6  80.6  80.6  80.7  80.6  79.7  78.7  78.3 
2007  78.0  77.4  76.5  75.7  74.8  73.6  72.7  72.0  71.8  71.7  71.4  70.8 
2008  70.2  69.8  69.7  69.7  69.7  69.3  68.7  68.5  68.3  68.1  68.2  68.4 
2009  68.6  68.8  68.9  69.2  69.6  70.1  70.9  72.0  73.2  74.0  74.4  74.7 
2010  75.4  76.4  77.3  78.1  78.9  79.5  79.9  80.4  82.5  85.8  88.3  90.2 
2011  91.9  93.5  96.7 101.3 106.5 111.7 116.1 118.7 118.8 118.5 119.6 121.8 
2012 124.7 127.2 127.3 126.2 124.3 121.6 119.9 119.5 119.2 119.5 120.5 120.5 
2013 119.1 118.1 117.2 116.7 118.3 121.0 124.1 128.2 132.5 134.9 135.6 136.1 
2014 137.5 138.9 141.1 143.9 145.1 145.8 145.4 142.9 140.3 138.7 137.6 137.4 
2015 136.4 134.3 131.6 127.6 123.6 119.9 116.4 113.9 111.4 108.4 105.8 102.7 
2016  99.8  98.0  96.5  95.1  93.1  90.4  87.8  85.7  83.9  82.7  81.3  80.2 
2017  79.5  78.8  78.8  78.8  78.1  77.7  77.3  76.8  76.3  75.6  75.0  74.8 
2018  74.3  73.6  72.1  70.6  70.2  70.0  70.0  70.0  70.1  70.3  70.5  70.3 
2019  70.0  69.8  69.7  69.6  69.6  69.7  69.7  69.8  69.7  69.5  69.3  69.3 
2020  69.5  69.8  70.1  70.5  71.6  73.0  73.8  74.1  74.5  75.0  75.5  76.2 
2021  77.1  77.9  78.9  80.2  80.7  81.2  83.0  85.5  88.5  92.4  97.2 101.3 
2022 104.7 108.4 112.1 115.9 119.2 122.4 127.3 133.0 137.4 139.8 141.4 144.3 
2023 148.6 152.3 154.7 156.0 157.6 159.1 158.5 157.8 157.8 158.4 160.4 162.8 
2024 164.7 169.5 175.1 180.2 185.4 189.0 191.1e190.9e190.8e190.6e188.6e185.2e
2025 180.9e173.9e167.0e161.3e155.7e151.1e145.2 143.5 142.3 140.4 139.1 138.5 
2026 137.5 136.3 134.9 133.9 132.8 130.9 128.8 126.6 124.2 121.9 119.5 116.9 
2027 114.3 111.4 108.6 106.4 104.3 101.7  99.4  97.4  95.4  93.5  92.2  91.4 
2028  90.5  89.8  89.1  87.8  86.5  86.0  86.0  85.8  85.5  84.9  84.0  82.9 
2029  81.7  80.6  79.5  79.0  78.7  77.9  76.9  76.3  76.0  75.7  75.5  75.4 
2030  75.3  75.0  74.7  74.2  73.4  72.6  72.2  71.8  71.5                   
=============================================================================

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The values in the smoothed sunspot number table 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).
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. The Bureau of Meteorology SWS solar cycle prediction is now based on the Version 2.0 values.
The values in the smoothed 10.7 cm solar flux table are derived from daily 10.7 cm solar flux values adjusted to 1 Astronomical Unit (A.U.). The daily values are averaged to provide monthly mean values which are then smoothed. The 10.7 cm solar radio flux data are provided as a service by the National Research Council of Canada.
In both tables, the observed monthly mean values are smoothed using a 13- month running filter (the values for the 1st and 13th months have half the weighting). Estimated values have an "e" suffix and are calculated from observed monthly and predicted smoothed numbers. Observed smoothed values precede the estimated values while predicted smoothed values follow the estimated values. If no estimated values are shown, all values are observed smoothed values and no prediction is shown.
 

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This page is updated monthly using observed monthly sunspot numbers from the Solar Influences Data Analysis Center (http://sidc.oma.be). Monthly values are smoothed using a 13 monthly running filter (first and last half weighting) and, where needed, combined with a predicted sunspot number curve for Cycle 24. Values which have an "e" next to them are based partly on observed and partly on predicted values. Values earlier in time to these are based entirely on observed values; values later in time are entirely predicted. Observed data are adjusted slightly at times to use the SIDC final monthly values which are available several months later - SIDC preliminary monthly values are used up to this time. All Solar Radio Flux values, including the "observed" values, are obtained from sunspot numbers using a statistical conversion. They are best described as equivalent solar flux values.