Last updated 03 Feb 2012 13:03 UT
| IPS OBSERVED AND PREDICTED SOLAR INDICES FOR CYCLE 24
Prepared by IPS Radio and Space Services
Issued on Feb 02 2012
------------------------ SMOOTHED SUNSPOT NUMBER ---------------------------
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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2000 113.0 116.9 120.0 120.9 119.0 118.8 119.8 118.7 116.3 114.5 112.7 112.1
2001 108.7 104.0 104.8 107.5 108.6 109.8 111.7 113.6 114.1 114.0 115.5 114.6
2002 113.5 114.6 113.3 110.5 108.8 106.2 102.7 98.7 94.6 90.5 85.3 82.1
2003 81.0 78.6 74.2 70.4 67.9 65.3 62.1 60.3 59.8 58.4 57.0 55.0
2004 52.1 49.4 47.2 45.6 43.9 41.7 40.2 39.3 37.6 35.9 35.4 35.2
2005 34.6 34.0 33.6 31.7 28.9 28.8 29.1 27.5 25.9 25.6 25.0 23.0
2006 20.8 18.7 17.4 17.1 17.4 16.4 15.3 15.6 15.6 14.2 12.7 12.1
2007 12.0 11.6 10.8 9.9 8.7 7.7 7.0 6.1 5.9 6.1 5.7 5.0
2008 4.2 3.6 3.3 3.3 3.5 3.2 2.7 2.6 2.2 1.8 1.7 1.7
2009 1.8 1.9 2.0 2.2 2.3 2.7 3.6 4.8 6.1 7.0 7.5 8.2
2010 9.2 10.6 12.3 13.9 15.4 16.3 16.7 17.4 19.6 23.2 26.5 28.9
2011 31.0 33.5 36.9 41.8 47.6 53.2 57.3 60.7e 63.4e 65.1e 67.7e 71.2e
2012 74.8e 77.9e 79.7e 80.0e 79.7e 80.1e 82.1e 84.1 86.1 87.5 89.4 90.2
2013 89.4 88.8 87.9 86.7 85.6 84.9 84.3 83.2 82.8 82.4 81.7 80.9
2014 80.6 80.8 81.3 81.4 81.1 80.3 78.7 77.2 75.8 74.0 72.0 70.5
2015 69.1 67.5 65.1 62.5 60.1 57.8 55.7 53.9 51.8 50.0 48.4 46.4
2016 44.4 43.0 41.3 39.4 37.9 36.4 34.9 33.9 33.1 32.1 30.7 29.1
2017 27.9 26.5 25.0 23.6 22.0 20.4 18.8 17.8 16.9 16.0 15.1 14.2
2018 13.7 13.3 12.8 12.4 12.0 11.4 10.4 9.4 8.6 8.0 7.4 6.4
2019 5.4 4.5 3.9 3.5 3.4 3.3 3.1 2.8 2.1 1.9 1.8 1.7
============================================================================
----------------- EQUIVALENT 10.7 CM SOLAR RADIO FLUX ---------------------
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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2000 162.2 166.2 169.4 170.3 168.3 168.1 169.2 168.0 165.6 163.7 161.9 161.2
2001 157.8 153.0 153.7 156.6 157.7 158.9 160.8 162.8 163.3 163.2 164.8 163.9
2002 162.7 163.9 162.5 159.6 157.9 155.2 151.6 147.6 143.4 139.3 134.1 131.0
2003 129.9 127.6 123.4 119.7 117.4 114.9 112.0 110.4 109.9 108.7 107.4 105.6
2004 103.2 100.8 98.9 97.6 96.2 94.4 93.3 92.5 91.2 89.9 89.5 89.4
2005 88.9 88.4 88.1 86.7 84.7 84.6 84.8 83.6 82.5 82.3 81.9 80.5
2006 79.0 77.6 76.8 76.7 76.8 76.2 75.5 75.7 75.7 74.8 73.9 73.6
2007 73.5 73.3 72.8 72.3 71.6 71.0 70.6 70.1 70.1 70.1 69.9 69.5
2008 69.1 68.8 68.6 68.7 68.7 68.6 68.4 68.3 68.1 67.9 67.9 67.8
2009 67.9 67.9 68.0 68.1 68.1 68.4 68.8 69.4 70.2 70.6 70.9 71.3
2010 71.9 72.7 73.6 74.6 75.6 76.1 76.4 76.8 78.2 80.7 82.9 84.6
2011 86.2 88.0 90.7 94.6 99.3 104.1 107.7 110.8e113.2e114.8e117.2e120.5e
2012 123.9e126.9e128.6e128.9e128.6e129.0e131.0e132.9 134.9 136.3 138.2 139.0
2013 138.2 137.6 136.7 135.5 134.4 133.7 133.2 132.1 131.7 131.3 130.6 129.8
2014 129.5 129.7 130.2 130.3 130.0 129.2 127.7 126.2 124.9 123.1 121.2 119.8
2015 118.5 117.0 114.8 112.4 110.2 108.1 106.3 104.7 102.9 101.3 100.0 98.3
2016 96.6 95.5 94.1 92.6 91.4 90.3 89.1 88.4 87.7 87.0 86.0 84.8
2017 83.9 82.9 81.9 80.9 79.8 78.8 77.7 77.1 76.5 75.9 75.4 74.8
2018 74.5 74.3 74.0 73.7 73.5 73.1 72.6 72.0 71.5 71.2 70.9 70.3
2019 69.8 69.3 69.0 68.8 68.7 68.7 68.6 68.4 68.0 67.9 67.9 67.8
============================================================================
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.
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Last updated 03 Feb 2012 13:03 UT
| OBSERVED MONTHLY SUNSPOT NUMBERS
1995 24.2 29.9 31.1 14.0 14.5 15.6 14.5 14.3 11.8 21.1 9.0 10.0
1996 11.5 4.4 9.2 4.8 5.5 11.8 8.2 14.4 1.6 0.9 17.9 13.3
1997 5.7 7.6 8.7 15.5 18.5 12.7 10.4 24.4 51.3 22.8 39.0 41.2
1998 31.9 40.3 54.8 53.4 56.3 70.7 66.6 92.2 92.9 55.5 74.0 81.9
1999 62.0 66.3 68.8 63.7 106.4 137.7 113.5 93.7 71.5 116.7 133.2 84.6
2000 90.1 112.9 138.5 125.5 121.6 125.5 170.1 130.5 109.7 99.4 106.8 104.4
2001 95.6 80.6 113.5 107.7 96.6 134.0 81.8 106.4 150.7 125.5 106.5 132.2
2002 114.1 107.4 98.4 120.7 120.8 88.3 99.6 116.4 109.6 97.5 95.0 81.6
2003 79.5 46.2 61.5 60.0 55.2 77.4 85.0 72.7 48.8 65.6 67.2 47.0
2004 37.2 46.0 48.9 39.3 41.5 43.2 51.0 40.9 27.7 48.4 43.7 17.9
2005 31.3 29.2 24.5 24.4 42.6 39.6 39.9 36.4 22.1 8.5 18.0 41.2
2006 15.4 5.0 10.8 30.2 22.2 13.9 12.2 12.9 14.5 10.4 21.5 13.6
2007 16.9 10.6 4.8 3.7 11.7 12.0 10.0 6.2 2.4 0.9 1.7 10.1
2008 3.4 2.1 9.3 2.9 2.9 3.1 0.5 0.5 1.1 2.9 4.1 0.8
2009 1.5 1.4 0.7 1.2 2.9 2.6 3.5 0.0 4.2 4.6 4.2 10.6
2010 13.1 18.6 15.4 7.9 8.8 13.5 16.1 19.6 25.2 23.5 21.6 14.5
2011 19.0 29.4 56.2 54.4 41.6 37.0 43.9 50.6 78.0 88.0 96.7 73.0
2012 58.3
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In more detail, the table above shows observed sunspot numbers (12 month smoothed) followed by estimated annd
predicted values. The values listed in the table with a qualifier "e" means that the value is an estimated value,
based partly on observed and partly on predicted values. Values in the table earlier than these values are
totally observed; later values are totally predicted.
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.
IPS also has a mailing list by which you can receive updated sunspot
number predictions each month. To
subscribe to this mailing list click here
Below is a graph of sunspot numbers:
Solar 
MAG: Normal