TABLE 3 ESTIMATES OF 13-MONTH SMOOTH SOLAR ACTIVITY FOR BALANCE OF CYCLE 23 CYCLE 24 AND BEGINNING OF CYCLE 25 TIME 10.7 CM SOLAR FLUX (F10.7) GEOMAGNETIC INDEX (Ap) PERCENTILE PERCENTILE 95.0% 50% 5.0% 95.0% 50% 5.0% 2002.0007 JAN 195.9 191.2 187.8 13.1 12.4 11.9 2002.0840 FEB 196.3 187.5 181.3 14.3 12.7 11.4 2002.1673 MAR 195.1 184.0 175.2 15.3 12.9 10.9 2002.2507 APR 193.9 180.8 170.2 15.9 13.0 10.9 2002.3340 MAY 194.2 177.5 165.5 16.8 13.2 10.8 2002.4173 JUN 193.4 173.6 159.7 17.1 13.4 10.5 2002.5007 JUL 190.4 169.8 153.7 16.8 13.5 10.3 2002.5840 AUG 186.3 166.7 149.9 17.2 13.7 10.1 2002.6673 SEP 182.5 163.9 147.4 17.0 13.8 10.1 2002.7507 OCT 179.5 161.5 144.5 16.7 13.9 10.2 2002.8340 NOV 175.7 158.9 143.5 17.1 14.1 10.6 2002.9173 DEC 169.6 154.9 140.3 18.1 14.3 10.9 2003.0007 JAN 165.2 149.8 135.3 18.2 14.4 11.0 2003.0840 FEB 162.1 145.4 130.8 18.2 14.4 11.5 2003.1673 MAR 160.4 142.0 127.0 18.2 14.5 11.8 2003.2507 APR 158.4 139.1 123.0 19.1 14.4 11.8 2003.3340 MAY 155.1 136.5 119.9 19.9 14.5 11.5 2003.4173 JUN 151.5 134.2 118.4 20.2 14.7 10.8 2003.5007 JUL 148.7 131.4 116.0 20.3 14.8 10.7 2003.5840 AUG 147.5 128.4 112.6 20.9 14.9 10.9 2003.6673 SEP 146.8 125.8 108.9 21.5 15.0 10.8 2003.7507 OCT 146.0 123.0 104.3 21.6 15.1 10.6 2003.8340 NOV 143.8 119.5 100.2 21.6 15.3 11.1 2003.9173 DEC 140.6 116.3 97.1 21.9 15.5 11.6 2004.0007 JAN 139.1 114.4 95.3 22.4 15.9 11.9 2004.0840 FEB 138.1 113.4 94.7 22.6 16.3 12.0 2004.1673 MAR 135.8 112.5 94.3 22.1 16.6 12.3 2004.2507 APR 133.3 111.5 94.0 21.3 16.7 12.6 2004.3340 MAY 131.7 110.2 93.2 21.4 16.8 12.5 2004.4173 JUN 130.6 108.3 91.5 21.9 16.7 12.5 2004.5007 JUL 128.7 106.0 89.5 21.8 16.8 13.1 2004.5840 AUG 125.6 103.7 87.4 22.7 17.1 13.6 2004.6673 SEP 121.8 101.5 86.1 23.3 17.3 13.6 2004.7507 OCT 118.0 99.4 85.1 23.0 17.2 13.7 2004.8340 NOV 114.4 97.6 84.3 22.9 17.0 13.4 2004.9173 DEC 113.0 96.4 83.7 23.0 16.6 12.8 2005.0007 JAN 111.3 95.1 82.9 23.0 16.1 12.0 2005.0840 FEB 109.3 93.2 82.0 23.5 15.8 11.1 2005.1673 MAR 106.2 91.0 80.8 24.0 15.4 10.0 2005.2507 APR 103.0 88.9 78.9 24.4 15.2 9.7 2005.3340 MAY 101.0 87.1 77.9 24.8 15.1 9.5 2005.4173 JUN 98.5 85.7 77.0 25.0 15.1 9.4 2005.5007 JUL 96.2 84.8 76.4 24.9 15.0 9.6 2005.5840 AUG 95.6 84.1 75.8 24.5 14.9 10.0 2005.6673 SEP 95.1 83.4 75.0 23.8 14.9 10.6 2005.7507 OCT 93.4 82.4 74.4 23.2 15.0 11.2 2005.8340 NOV 91.8 81.4 73.8 23.1 15.3 11.6 2005.9173 DEC 90.2 80.4 73.2 23.0 15.6 11.3 2006.0007 JAN 88.6 79.4 72.7 23.1 16.1 11.4 2006.0840 FEB 87.1 78.4 72.1 22.8 16.3 11.7 2006.1673 MAR 85.5 77.5 71.5 22.3 16.3 12.1 2006.2507 APR 84.1 76.6 71.0 21.6 16.2 12.1 2006.3340 MAY 82.7 75.7 70.5 20.6 16.1 12.3 2006.4173 JUN 81.3 74.8 70.0 19.5 16.0 12.6 2006.5007 JUL 80.1 74.1 69.5 18.8 15.8 13.1 2006.5840 AUG 78.9 73.3 69.1 18.4 15.7 13.2 2006.6673 SEP 77.8 72.6 68.7 18.6 15.7 13.3 2006.7507 OCT 76.8 72.0 68.3 18.9 15.7 13.4 2006.8340 NOV 75.9 71.4 68.0 18.9 15.6 13.0 2006.9173 DEC 75.1 71.0 67.7 18.4 15.4 12.3 2007.0007 JAN 74.5 70.6 67.5 18.1 15.1 11.8 2007.0840 FEB 73.9 70.2 67.3 17.8 15.0 11.8 2007.1673 MAR 73.6 70.0 67.1 17.8 15.0 12.1 2007.2507 APR 73.3 69.8 67.0 18.1 15.0 12.1 2007.3340 MAY 73.2 69.8 67.0 18.5 14.9 12.1 2007.4173 JUN 73.4 69.9 67.1 18.4 14.7 12.1 2007.5007 JUL 74.0 70.3 67.3 18.1 14.4 12.1 2007.5840 AUG 74.8 70.7 67.4 17.3 13.7 11.5 2007.6673 SEP 75.7 71.0 67.5 16.5 13.1 10.9 2007.7507 OCT 76.7 71.5 67.6 15.7 12.5 10.3 2007.8340 NOV 78.3 72.0 67.9 14.9 12.0 9.8 2007.9173 DEC 79.6 72.7 68.1 14.2 11.4 9.2 2008.0007 JAN 81.1 73.3 68.2 13.6 10.9 8.8 2008.0840 FEB 83.4 74.2 68.2 13.0 10.4 8.3 2008.1673 MAR 86.5 75.1 68.3 12.4 10.0 7.9 2008.2507 APR 91.3 76.3 68.3 12.0 9.7 7.6 2008.3340 MAY 95.8 77.7 68.3 11.6 9.4 7.3 2008.4173 JUN 99.3 79.1 68.6 11.3 9.2 7.1 2008.5007 JUL 104.6 80.8 68.6 11.2 9.0 7.0 2008.5840 AUG 110.7 82.8 68.7 11.1 9.0 6.9 2008.6673 SEP 116.6 84.9 68.9 11.3 9.1 6.9 2008.7507 OCT 124.0 87.2 68.9 11.6 9.3 7.1 2008.8340 NOV 132.5 89.6 69.0 11.7 9.4 7.4 2008.9173 DEC 139.0 92.2 69.4 11.9 9.5 7.5 2009.0007 JAN 143.6 95.0 69.8 12.0 9.6 7.5 2009.0840 FEB 147.9 97.8 70.1 12.1 9.6 7.3 2009.1673 MAR 152.2 100.6 70.8 12.2 9.7 7.2 2009.2507 APR 157.0 103.3 71.2 12.6 9.8 7.0 2009.3340 MAY 162.1 106.3 71.4 12.9 10.1 6.9 2009.4173 JUN 167.2 109.5 72.1 13.3 10.5 7.1 2009.5007 JUL 171.5 112.8 72.7 13.8 10.8 7.5 2009.5840 AUG 177.3 115.9 73.3 14.6 11.1 7.8 2009.6673 SEP 185.2 119.0 74.0 15.8 11.4 7.6 2009.7507 OCT 190.2 122.2 74.3 16.2 11.6 7.6 2009.8340 NOV 192.8 125.1 74.6 16.4 11.7 7.5 2009.9173 DEC 195.4 127.5 75.0 16.9 11.9 7.5 2010.0007 JAN 198.3 129.7 75.3 18.1 12.2 7.5 2010.0840 FEB 202.9 131.9 75.5 19.0 12.6 7.6 2010.1673 MAR 209.1 134.3 75.5 19.2 12.8 7.6 2010.2507 APR 213.2 136.8 75.1 19.3 13.0 7.7 2010.3340 MAY 215.9 139.1 74.9 19.1 13.2 7.6 2010.4173 JUN 220.4 141.2 75.2 18.7 13.3 7.6 2010.5007 JUL 225.0 143.1 75.5 18.6 13.3 7.7 2010.5840 AUG 227.3 144.9 76.3 19.0 13.5 7.9 2010.6673 SEP 228.4 146.5 77.5 18.9 13.6 8.1 2010.7507 OCT 230.3 147.9 78.2 17.9 13.6 8.5 2010.8340 NOV 232.4 148.8 79.1 18.0 13.8 8.6 2010.9173 DEC 235.4 149.7 80.7 18.6 14.1 8.6 2011.0007 JAN 238.7 150.1 82.6 19.2 14.3 8.9 2011.0840 FEB 240.3 150.5 84.7 19.7 14.8 9.3 2011.1673 MAR 238.7 150.8 85.9 20.4 15.1 9.5 2011.2507 APR 236.9 151.0 86.9 20.4 15.2 9.5 2011.3340 MAY 238.1 151.2 88.8 20.4 15.2 9.7 2011.4173 JUN 238.7 150.6 90.2 20.6 15.2 9.9 2011.5007 JUL 236.3 149.2 92.2 20.9 15.4 10.4 2011.5840 AUG 232.9 148.1 93.5 21.3 15.4 11.0 2011.6673 SEP 229.2 147.5 94.0 21.3 15.3 11.6 2011.7507 OCT 227.4 147.4 95.3 21.5 15.1 11.2 2011.8340 NOV 227.8 147.4 95.6 21.7 15.1 11.1 2011.9173 DEC 227.9 147.1 95.2 22.1 15.1 10.6 2012.0007 JAN 226.5 146.7 95.3 22.9 15.0 10.1 2012.0840 FEB 224.8 146.3 96.8 22.6 14.7 9.8 2012.1673 MAR 224.3 145.7 97.5 21.4 14.4 10.0 2012.2507 APR 224.2 145.2 97.1 20.7 14.3 10.0 2012.3340 MAY 223.6 144.8 96.3 20.1 14.2 10.2 2012.4173 JUN 222.6 144.0 96.3 19.7 14.1 10.5 2012.5007 JUL 220.3 143.0 96.8 19.6 14.1 10.5 2012.5840 AUG 216.8 141.4 95.9 19.4 14.1 10.4 2012.6673 SEP 213.9 139.8 95.4 19.2 14.4 10.4 2012.7507 OCT 211.1 138.6 96.2 19.0 14.7 10.4 2012.8340 NOV 207.6 137.6 97.2 19.0 14.9 10.2 2012.9173 DEC 206.6 136.3 96.2 19.5 14.8 9.8 2013.0007 JAN 204.5 134.6 94.6 20.5 14.9 10.1 2013.0840 FEB 201.1 132.8 93.9 22.1 15.3 10.6 2013.1673 MAR 197.5 131.4 93.6 23.5 15.6 10.6 2013.2507 APR 195.2 130.3 91.9 24.1 15.8 10.8 2013.3340 MAY 193.4 128.9 88.5 25.3 16.1 10.9 2013.4173 JUN 189.6 127.1 87.7 25.8 16.3 11.1 2013.5007 JUL 185.1 125.5 88.8 25.0 16.3 11.4 2013.5840 AUG 180.7 124.2 88.3 24.9 16.2 11.6 2013.6673 SEP 176.8 123.1 87.0 24.1 16.2 11.7 2013.7507 OCT 174.6 122.0 86.0 22.2 16.1 11.7 2013.8340 NOV 172.7 120.8 85.7 22.5 16.2 11.9 2013.9173 DEC 168.6 119.2 84.8 23.2 16.3 11.7 2014.0007 JAN 162.0 117.2 83.5 23.3 16.3 10.9 2014.0840 FEB 156.1 115.4 82.5 22.8 16.1 10.6 2014.1673 MAR 152.5 113.5 81.9 22.1 15.9 10.7 2014.2507 APR 150.3 111.5 81.9 22.0 15.9 10.7 2014.3340 MAY 148.0 109.8 81.6 22.9 16.1 10.6 2014.4173 JUN 145.1 108.3 80.4 23.8 16.4 10.7 2014.5007 JUL 142.0 106.9 80.5 24.0 16.6 10.7 2014.5840 AUG 138.4 105.4 80.2 24.0 16.8 10.6 2014.6673 SEP 134.5 103.9 79.5 24.0 16.9 10.5 2014.7507 OCT 130.1 102.4 79.0 23.6 16.9 10.2 2014.8340 NOV 124.1 100.8 78.2 22.7 16.9 10.3 2014.9173 DEC 119.1 99.3 77.1 22.9 16.8 10.5 2015.0007 JAN 118.2 98.0 75.4 23.1 16.9 11.3 2015.0840 FEB 118.7 96.9 74.3 23.2 17.2 11.8 2015.1673 MAR 119.3 95.9 73.6 22.6 17.3 11.9 2015.2507 APR 119.6 95.0 72.8 21.6 17.2 12.1 2015.3340 MAY 118.8 94.0 71.8 21.3 17.1 12.2 2015.4173 JUN 117.4 92.9 71.3 21.8 16.9 12.4 2015.5007 JUL 116.0 91.8 70.8 21.8 16.7 13.2 2015.5840 AUG 113.9 90.7 70.4 22.2 16.8 13.0 2015.6673 SEP 110.2 89.5 70.3 22.6 16.9 12.7 2015.7507 OCT 105.1 88.2 70.4 22.4 16.9 13.0 2015.8340 NOV 102.7 87.3 70.2 22.4 16.7 12.7 2015.9173 DEC 101.7 86.6 70.1 22.8 16.5 12.4 2016.0007 JAN 100.2 85.8 70.2 23.0 16.1 12.0 2016.0840 FEB 98.1 84.7 70.1 23.6 15.8 11.1 2016.1673 MAR 96.3 83.6 70.3 24.2 15.6 10.4 2016.2507 APR 94.5 82.5 69.8 25.0 15.5 10.5 2016.3340 MAY 93.4 81.8 69.6 25.5 15.5 10.6 2016.4173 JUN 92.1 81.0 69.4 25.7 15.5 10.5 2016.5007 JUL 91.7 80.3 69.3 25.6 15.4 10.6 2016.5840 AUG 91.1 79.5 69.0 25.0 15.3 10.9 2016.6673 SEP 90.5 78.8 68.7 24.1 15.1 11.0 2016.7507 OCT 89.8 78.1 68.4 23.1 14.9 11.2 2016.8340 NOV 88.9 77.5 68.3 22.6 15.0 11.1 2016.9173 DEC 88.0 77.0 68.3 22.2 15.2 11.0 2017.0007 JAN 87.1 76.4 68.2 21.9 15.4 11.1 2017.0840 FEB 85.8 75.9 68.0 21.5 15.5 11.3 2017.1673 MAR 84.4 75.4 67.7 20.8 15.5 11.4 2017.2507 APR 82.3 74.8 67.5 20.0 15.3 11.4 2017.3340 MAY 79.9 74.2 67.6 20.1 15.1 11.7 2017.4173 JUN 78.4 73.5 67.4 20.2 14.9 11.9 2017.5007 JUL 77.5 72.9 67.3 19.9 14.7 11.6 2017.5840 AUG 77.0 72.4 67.2 19.5 14.6 11.5 2017.6673 SEP 76.9 72.0 67.2 19.0 14.6 11.1 2017.7507 OCT 76.7 71.6 67.2 18.2 14.6 10.6 2017.8340 NOV 76.5 71.3 67.1 17.3 14.5 9.8 2017.9173 DEC 76.2 71.0 67.1 17.4 14.4 9.4 2018.0007 JAN 75.2 70.7 67.0 17.5 14.3 9.3 2018.0840 FEB 74.2 70.4 67.0 17.6 14.2 9.3 2018.1673 MAR 74.0 70.1 67.0 17.6 14.1 9.3