TABLE 4 ESTIMATES OF 13-MONTH SMOOTH SOLAR ACTIVITY FOR BALANCE OF CYCLE 23 CYCLE 24 AND BEGINNING OF CYCLE 25 TIME SUNSPOT NUMBERS GEOMAGNETIC INDEX (Ap) PERCENTILE PERCENTILE 95.0% 50% 5.0% 95.0% 50% 5.0% 2002.0007 JAN 117.6 112.6 108.9 13.1 12.4 11.9 2002.0840 FEB 120.0 110.7 103.5 14.3 12.7 11.4 2002.1673 MAR 120.7 108.8 98.5 15.3 12.9 10.9 2002.2507 APR 120.8 106.2 94.4 15.9 13.0 10.9 2002.3340 MAY 122.3 103.7 90.3 16.8 13.2 10.8 2002.4173 JUN 123.3 101.1 85.4 17.1 13.4 10.5 2002.5007 JUL 121.5 98.4 80.3 16.8 13.5 10.3 2002.5840 AUG 118.4 96.2 77.3 17.2 13.7 10.1 2002.6673 SEP 115.0 94.3 75.8 17.0 13.8 10.1 2002.7507 OCT 112.0 92.3 74.7 16.7 13.9 10.2 2002.8340 NOV 108.8 90.2 73.2 17.1 14.1 10.6 2002.9173 DEC 104.2 87.6 71.0 18.1 14.3 10.9 2003.0007 JAN 102.3 84.5 67.9 18.2 14.4 11.0 2003.0840 FEB 100.3 81.2 64.6 18.2 14.4 11.5 2003.1673 MAR 99.1 78.0 61.2 18.2 14.5 11.8 2003.2507 APR 97.6 75.3 57.1 19.1 14.4 11.8 2003.3340 MAY 94.9 73.3 54.2 19.9 14.5 11.5 2003.4173 JUN 91.8 71.6 53.1 20.2 14.7 10.8 2003.5007 JUL 89.7 69.5 51.0 20.3 14.8 10.7 2003.5840 AUG 89.8 67.3 48.1 20.9 14.9 10.9 2003.6673 SEP 89.9 65.1 44.4 21.5 15.0 10.8 2003.7507 OCT 90.0 62.8 39.5 21.6 15.1 10.6 2003.8340 NOV 89.0 60.3 35.7 21.6 15.3 11.1 2003.9173 DEC 86.5 57.6 33.0 21.9 15.5 11.6 2004.0007 JAN 84.9 55.4 30.8 22.4 15.9 11.9 2004.0840 FEB 83.8 54.3 29.7 22.6 16.3 12.0 2004.1673 MAR 81.4 53.2 29.2 22.1 16.6 12.3 2004.2507 APR 78.8 52.0 28.7 21.3 16.7 12.6 2004.3340 MAY 76.9 50.5 27.8 21.4 16.8 12.5 2004.4173 JUN 75.7 48.6 25.9 21.9 16.7 12.5 2004.5007 JUL 74.1 46.4 23.7 21.8 16.8 13.1 2004.5840 AUG 71.5 44.3 21.8 22.7 17.1 13.6 2004.6673 SEP 68.5 42.5 20.9 23.3 17.3 13.6 2004.7507 OCT 64.9 40.6 20.4 23.0 17.2 13.7 2004.8340 NOV 61.6 39.2 20.4 22.9 17.0 13.4 2004.9173 DEC 60.1 38.2 20.0 23.0 16.6 12.8 2005.0007 JAN 58.9 37.1 19.5 23.0 16.1 12.0 2005.0840 FEB 57.1 35.5 19.4 23.5 15.8 11.1 2005.1673 MAR 54.4 33.5 18.7 24.0 15.4 10.0 2005.2507 APR 51.6 31.8 17.0 24.4 15.2 9.7 2005.3340 MAY 50.2 30.4 16.7 24.8 15.1 9.5 2005.4173 JUN 47.9 29.3 16.7 25.0 15.1 9.4 2005.5007 JUL 44.9 28.2 16.1 24.9 15.0 9.6 2005.5840 AUG 42.5 27.4 15.6 24.5 14.9 10.0 2005.6673 SEP 41.9 26.6 15.2 23.8 14.9 10.6 2005.7507 OCT 40.9 25.6 14.1 23.2 15.0 11.2 2005.8340 NOV 38.7 24.1 13.0 23.1 15.3 11.6 2005.9173 DEC 36.4 22.5 11.9 23.0 15.6 11.3 2006.0007 JAN 34.2 21.0 10.8 23.1 16.1 11.4 2006.0840 FEB 32.0 19.5 9.7 22.8 16.3 11.7 2006.1673 MAR 29.9 18.0 8.7 22.3 16.3 12.1 2006.2507 APR 27.8 16.6 7.7 21.6 16.2 12.1 2006.3340 MAY 25.8 15.3 6.7 20.6 16.1 12.3 2006.4173 JUN 23.9 13.9 5.7 19.5 16.0 12.6 2006.5007 JUL 22.1 12.7 4.8 18.8 15.8 13.1 2006.5840 AUG 20.4 11.5 4.0 18.4 15.7 13.2 2006.6673 SEP 18.8 10.5 3.2 18.6 15.7 13.3 2006.7507 OCT 17.4 9.5 2.5 18.9 15.7 13.4 2006.8340 NOV 16.1 8.6 1.9 18.9 15.6 13.0 2006.9173 DEC 15.0 7.8 1.4 18.4 15.4 12.3 2007.0007 JAN 14.1 7.2 0.9 18.1 15.1 11.8 2007.0840 FEB 13.3 6.7 0.5 17.8 15.0 11.8 2007.1673 MAR 12.7 6.3 0.2 17.8 15.0 12.1 2007.2507 APR 12.4 6.1 0.1 18.1 15.0 12.1 2007.3340 MAY 12.3 6.0 0.0 18.5 14.9 12.1 2007.4173 JUN 12.9 6.3 0.4 18.4 14.7 12.1 2007.5007 JUL 14.3 6.9 0.7 18.1 14.4 12.1 2007.5840 AUG 15.5 7.6 1.0 17.3 13.7 11.5 2007.6673 SEP 16.7 8.2 1.5 16.5 13.1 10.9 2007.7507 OCT 18.1 9.0 1.7 15.7 12.5 10.3 2007.8340 NOV 20.6 9.9 2.2 14.9 12.0 9.8 2007.9173 DEC 22.9 10.9 2.7 14.2 11.4 9.2 2008.0007 JAN 25.0 12.0 2.9 13.6 10.9 8.8 2008.0840 FEB 28.3 13.2 3.1 13.0 10.4 8.3 2008.1673 MAR 32.2 14.6 3.3 12.4 10.0 7.9 2008.2507 APR 38.3 16.3 3.3 12.0 9.7 7.6 2008.3340 MAY 43.7 18.3 3.3 11.6 9.4 7.3 2008.4173 JUN 47.9 20.4 4.0 11.3 9.2 7.1 2008.5007 JUL 53.9 22.6 4.2 11.2 9.0 7.0 2008.5840 AUG 60.9 25.0 4.3 11.1 9.0 6.9 2008.6673 SEP 67.5 27.6 4.8 11.3 9.1 6.9 2008.7507 OCT 75.1 30.2 4.6 11.6 9.3 7.1 2008.8340 NOV 83.9 33.0 4.8 11.7 9.4 7.4 2008.9173 DEC 90.9 36.2 5.6 11.9 9.5 7.5 2009.0007 JAN 96.0 39.9 6.6 12.0 9.6 7.5 2009.0840 FEB 100.8 43.5 7.3 12.1 9.6 7.3 2009.1673 MAR 105.5 46.9 8.6 12.2 9.7 7.2 2009.2507 APR 110.7 50.3 9.5 12.6 9.8 7.0 2009.3340 MAY 116.4 53.7 9.6 12.9 10.1 6.9 2009.4173 JUN 121.8 57.4 11.1 13.3 10.5 7.1 2009.5007 JUL 126.2 61.0 12.2 13.8 10.8 7.5 2009.5840 AUG 134.2 64.5 13.2 14.6 11.1 7.8 2009.6673 SEP 141.9 67.7 14.4 15.8 11.4 7.6 2009.7507 OCT 146.6 71.2 14.9 16.2 11.6 7.6 2009.8340 NOV 148.6 74.6 15.4 16.4 11.7 7.5 2009.9173 DEC 151.8 77.4 16.0 16.9 11.9 7.5 2010.0007 JAN 155.5 79.8 16.4 18.1 12.2 7.5 2010.0840 FEB 159.3 81.9 16.7 19.0 12.6 7.6 2010.1673 MAR 164.8 84.2 16.6 19.2 12.8 7.6 2010.2507 APR 168.2 86.5 16.1 19.3 13.0 7.7 2010.3340 MAY 169.9 88.9 15.7 19.1 13.2 7.6 2010.4173 JUN 173.9 91.1 16.1 18.7 13.3 7.6 2010.5007 JUL 178.8 93.2 16.6 18.6 13.3 7.7 2010.5840 AUG 181.8 95.2 17.7 19.0 13.5 7.9 2010.6673 SEP 183.9 97.4 19.5 18.9 13.6 8.1 2010.7507 OCT 186.7 99.4 20.7 17.9 13.6 8.5 2010.8340 NOV 189.2 100.7 22.0 18.0 13.8 8.6 2010.9173 DEC 191.5 101.6 24.3 18.6 14.1 8.6 2011.0007 JAN 192.9 101.8 27.0 19.2 14.3 8.9 2011.0840 FEB 194.3 102.2 29.8 19.7 14.8 9.3 2011.1673 MAR 194.4 103.0 31.5 20.4 15.1 9.5 2011.2507 APR 193.8 103.6 32.8 20.4 15.2 9.5 2011.3340 MAY 195.2 104.2 35.3 20.4 15.2 9.7 2011.4173 JUN 195.8 103.7 37.1 20.6 15.2 9.9 2011.5007 JUL 192.6 102.3 39.5 20.9 15.4 10.4 2011.5840 AUG 188.0 101.0 41.2 21.3 15.4 11.0 2011.6673 SEP 183.4 100.2 41.9 21.3 15.3 11.6 2011.7507 OCT 181.2 100.0 43.4 21.5 15.1 11.2 2011.8340 NOV 180.5 99.8 43.7 21.7 15.1 11.1 2011.9173 DEC 179.4 99.1 43.2 22.1 15.1 10.6 2012.0007 JAN 178.2 98.5 43.3 22.9 15.0 10.1 2012.0840 FEB 176.8 98.0 45.1 22.6 14.7 9.8 2012.1673 MAR 176.1 97.4 46.0 21.4 14.4 10.0 2012.2507 APR 175.0 96.8 45.4 20.7 14.3 10.0 2012.3340 MAY 173.8 95.9 44.6 20.1 14.2 10.2 2012.4173 JUN 172.1 94.9 44.5 19.7 14.1 10.5 2012.5007 JUL 169.5 93.7 45.1 19.6 14.1 10.5 2012.5840 AUG 165.3 92.0 44.1 19.4 14.1 10.4 2012.6673 SEP 162.0 90.2 43.4 19.2 14.4 10.4 2012.7507 OCT 158.7 88.8 44.4 19.0 14.7 10.4 2012.8340 NOV 154.4 87.7 45.5 19.0 14.9 10.2 2012.9173 DEC 150.8 86.3 44.5 19.5 14.8 9.8 2013.0007 JAN 146.5 84.6 42.5 20.5 14.9 10.1 2013.0840 FEB 142.9 83.1 41.6 22.1 15.3 10.6 2013.1673 MAR 142.2 81.9 41.3 23.5 15.6 10.6 2013.2507 APR 138.9 80.6 39.2 24.1 15.8 10.8 2013.3340 MAY 136.8 79.1 34.9 25.3 16.1 10.9 2013.4173 JUN 135.9 77.3 33.9 25.8 16.3 11.1 2013.5007 JUL 132.9 75.6 35.4 25.0 16.3 11.4 2013.5840 AUG 129.3 74.2 34.8 24.9 16.2 11.6 2013.6673 SEP 125.3 73.1 33.1 24.1 16.2 11.7 2013.7507 OCT 121.0 71.9 31.9 22.2 16.1 11.7 2013.8340 NOV 117.5 70.5 31.3 22.5 16.2 11.9 2013.9173 DEC 115.3 68.8 30.2 23.2 16.3 11.7 2014.0007 JAN 111.4 66.9 28.4 23.3 16.3 10.9 2014.0840 FEB 104.9 64.9 27.0 22.8 16.1 10.6 2014.1673 MAR 98.0 62.6 26.2 22.1 15.9 10.7 2014.2507 APR 94.1 60.4 26.3 22.0 15.9 10.7 2014.3340 MAY 93.1 58.6 25.8 22.9 16.1 10.6 2014.4173 JUN 92.2 57.1 24.2 23.8 16.4 10.7 2014.5007 JUL 89.9 55.6 24.3 24.0 16.6 10.7 2014.5840 AUG 87.6 54.1 23.9 24.0 16.8 10.6 2014.6673 SEP 83.8 52.4 22.9 24.0 16.9 10.5 2014.7507 OCT 80.3 50.7 22.1 23.6 16.9 10.2 2014.8340 NOV 76.6 49.0 20.9 22.7 16.9 10.3 2014.9173 DEC 71.1 47.1 19.3 22.9 16.8 10.5 2015.0007 JAN 69.8 45.4 16.8 23.1 16.9 11.3 2015.0840 FEB 70.3 44.2 14.9 23.2 17.2 11.8 2015.1673 MAR 69.9 42.9 13.8 22.6 17.3 11.9 2015.2507 APR 69.7 41.8 12.3 21.6 17.2 12.1 2015.3340 MAY 68.9 40.4 10.5 21.3 17.1 12.2 2015.4173 JUN 66.9 38.9 9.5 21.8 16.9 12.4 2015.5007 JUL 64.3 37.4 8.7 21.8 16.7 13.2 2015.5840 AUG 61.0 36.1 7.8 22.2 16.8 13.0 2015.6673 SEP 56.5 34.7 7.6 22.6 16.9 12.7 2015.7507 OCT 52.1 33.2 7.7 22.4 16.9 13.0 2015.8340 NOV 48.9 32.1 7.4 22.4 16.7 12.7 2015.9173 DEC 49.9 31.3 7.2 22.8 16.5 12.4 2016.0007 JAN 49.1 30.3 7.3 23.0 16.1 12.0 2016.0840 FEB 46.6 29.0 7.2 23.6 15.8 11.1 2016.1673 MAR 44.5 27.6 7.7 24.2 15.6 10.4 2016.2507 APR 42.4 26.3 6.6 25.0 15.5 10.5 2016.3340 MAY 41.1 25.4 6.2 25.5 15.5 10.6 2016.4173 JUN 39.5 24.4 5.8 25.7 15.5 10.5 2016.5007 JUL 38.9 23.5 5.4 25.6 15.4 10.6 2016.5840 AUG 38.3 22.5 4.9 25.0 15.3 10.9 2016.6673 SEP 37.9 21.6 4.3 24.1 15.1 11.0 2016.7507 OCT 37.1 20.6 3.5 23.1 14.9 11.2 2016.8340 NOV 36.1 19.7 3.4 22.6 15.0 11.1 2016.9173 DEC 34.9 19.0 3.3 22.2 15.2 11.0 2017.0007 JAN 33.5 18.1 3.1 21.9 15.4 11.1 2017.0840 FEB 31.8 17.1 2.5 21.5 15.5 11.3 2017.1673 MAR 29.9 16.2 1.9 20.8 15.5 11.4 2017.2507 APR 27.1 15.3 1.4 20.0 15.3 11.4 2017.3340 MAY 24.6 14.3 1.4 20.1 15.1 11.7 2017.4173 JUN 22.2 13.1 1.2 20.2 14.9 11.9 2017.5007 JUL 20.3 12.0 0.8 19.9 14.7 11.6 2017.5840 AUG 19.2 11.1 0.5 19.5 14.6 11.5 2017.6673 SEP 19.0 10.3 0.4 19.0 14.6 11.1 2017.7507 OCT 18.6 9.5 0.4 18.2 14.6 10.6 2017.8340 NOV 18.2 8.8 0.3 17.3 14.5 9.8 2017.9173 DEC 16.8 8.3 0.2 17.4 14.4 9.4 2018.0007 JAN 15.9 7.8 0.1 17.5 14.3 9.3 2018.0840 FEB 15.9 7.3 0.0 17.6 14.2 9.3 2018.1673 MAR 15.1 6.8 0.0 17.6 14.1 9.3