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% 2000.6673 SEP 182.1 177.9 173.9 14.7 14.1 13.1 2000.7507 OCT 182.9 177.1 171.1 15.3 13.9 12.2 2000.8340 NOV 185.7 176.8 168.5 16.3 14.0 12.0 2000.9173 DEC 188.4 176.4 166.3 17.0 14.0 12.0 2001.0007 JAN 189.9 175.6 161.6 17.2 13.9 11.7 2001.0840 FEB 190.7 174.4 157.0 17.1 13.6 11.1 2001.1673 MAR 191.9 173.4 152.6 16.9 13.5 10.7 2001.2507 APR 194.0 172.8 150.4 16.7 13.5 10.7 2001.3340 MAY 194.7 172.3 148.6 16.4 13.5 10.9 2001.4173 JUN 195.1 171.1 146.3 16.4 13.5 11.0 2001.5007 JUL 196.1 169.4 143.9 16.7 13.5 11.1 2001.5840 AUG 196.9 167.3 141.0 17.0 13.5 11.2 2001.6673 SEP 197.1 165.4 139.2 16.9 13.7 11.0 2001.7507 OCT 197.4 163.9 136.9 17.4 14.0 11.0 2001.8340 NOV 197.8 162.4 135.2 17.6 14.1 10.9 2001.9173 DEC 197.5 160.6 133.7 17.2 13.9 10.5 2002.0007 JAN 195.7 158.2 132.5 17.2 13.9 11.0 2002.0840 FEB 192.7 155.2 131.0 18.6 14.3 11.7 2002.1673 MAR 189.6 152.8 129.4 19.8 14.6 11.8 2002.2507 APR 185.7 150.6 127.6 20.5 14.8 11.7 2002.3340 MAY 182.9 148.5 126.4 21.6 15.0 11.7 2002.4173 JUN 180.2 146.0 124.7 22.0 15.2 11.5 2002.5007 JUL 176.9 143.6 120.8 21.4 15.3 11.5 2002.5840 AUG 173.6 141.7 118.5 21.4 15.3 11.5 2002.6673 SEP 170.1 140.0 117.2 20.9 15.3 11.5 2002.7507 OCT 167.2 138.3 115.4 19.2 15.3 11.4 2002.8340 NOV 165.3 136.6 114.0 18.7 15.4 11.4 2002.9173 DEC 161.6 134.1 111.5 19.0 15.5 11.4 2003.0007 JAN 155.7 130.9 108.2 19.1 15.5 11.6 2003.0840 FEB 151.8 128.2 105.5 19.4 15.5 11.3 2003.1673 MAR 150.4 125.8 103.8 19.6 15.5 11.2 2003.2507 APR 148.4 123.3 102.7 20.4 15.4 11.1 2003.3340 MAY 145.3 121.2 100.6 21.3 15.6 11.1 2003.4173 JUN 142.1 119.4 99.4 21.6 15.8 11.3 2003.5007 JUL 139.5 117.1 97.7 21.9 15.9 11.3 2003.5840 AUG 138.5 114.8 95.5 22.5 16.1 11.2 2003.6673 SEP 138.0 112.8 92.9 23.1 16.2 11.0 2003.7507 OCT 137.5 110.7 89.5 23.1 16.3 10.7 2003.8340 NOV 136.2 108.4 86.7 22.9 16.3 10.7 2003.9173 DEC 133.8 106.4 84.9 23.1 16.4 10.8 2004.0007 JAN 132.5 104.8 83.7 23.3 16.6 11.5 2004.0840 FEB 131.2 103.6 82.8 23.4 16.9 12.0 2004.1673 MAR 128.8 102.6 82.5 22.7 17.1 12.1 2004.2507 APR 126.8 101.8 82.4 21.7 17.1 12.2 2004.3340 MAY 125.6 100.8 81.9 21.4 16.9 12.3 2004.4173 JUN 124.9 99.4 80.7 21.8 16.8 12.4 2004.5007 JUL 123.4 97.8 79.4 21.8 16.8 13.2 2004.5840 AUG 120.6 96.2 78.3 22.7 17.0 13.6 2004.6673 SEP 117.3 94.5 77.8 23.2 17.1 13.5 2004.7507 OCT 113.8 92.9 77.4 22.9 17.0 13.6 2004.8340 NOV 110.7 91.7 77.2 22.7 16.8 13.1 2004.9173 DEC 109.8 90.7 76.8 22.8 16.5 12.5 2005.0007 JAN 108.1 89.6 76.2 22.9 16.0 11.9 2005.0840 FEB 106.4 88.3 76.0 23.4 15.8 10.9 2005.1673 MAR 103.9 86.8 75.6 23.8 15.5 9.8 2005.2507 APR 101.3 85.4 74.6 24.2 15.3 9.4 2005.3340 MAY 99.6 84.3 74.5 24.5 15.2 9.2 2005.4173 JUN 97.6 83.3 74.9 24.7 15.2 8.9 2005.5007 JUL 95.1 82.5 74.6 24.5 15.1 9.0 2005.5840 AUG 93.2 81.8 74.4 24.0 15.0 9.3 2005.6673 SEP 92.6 81.1 74.1 23.3 14.9 9.8 2005.7507 OCT 91.9 80.5 73.8 22.6 14.8 10.3 2005.8340 NOV 90.4 79.6 73.2 22.3 14.9 10.6 2005.9173 DEC 89.0 78.8 72.7 22.1 15.1 10.8 2006.0007 JAN 87.5 78.0 72.2 21.9 15.4 11.2 2006.0840 FEB 86.1 77.2 71.7 21.6 15.5 11.5 2006.1673 MAR 84.7 76.4 71.2 21.0 15.5 11.7 2006.2507 APR 83.4 75.6 70.7 20.3 15.3 11.8 2006.3340 MAY 82.1 74.8 70.2 20.0 15.2 12.3 2006.4173 JUN 80.8 74.1 69.8 20.1 15.0 11.7 2006.5007 JUL 79.6 73.5 69.3 19.8 14.9 11.4 2006.5840 AUG 78.5 72.8 68.9 19.3 14.8 11.4 2006.6673 SEP 77.5 72.2 68.6 18.8 14.8 11.3 2006.7507 OCT 76.6 71.7 68.2 18.0 14.8 11.4 2006.8340 NOV 75.7 71.2 67.9 18.0 14.8 10.6 2006.9173 DEC 75.0 70.8 67.6 17.8 14.6 10.3 2007.0007 JAN 74.4 70.5 67.4 17.7 14.5 10.3 2007.0840 FEB 73.9 70.2 67.2 17.5 14.5 10.4 2007.1673 MAR 73.5 70.0 67.1 17.2 14.4 10.6 2007.2507 APR 73.3 69.8 67.0 16.6 14.0 10.3 2007.3340 MAY 73.2 69.8 67.0 16.1 13.5 9.9 2007.4173 JUN 73.4 69.9 67.1 15.6 13.0 9.6 2007.5007 JUL 74.0 70.3 67.3 15.1 12.6 9.3 2007.5840 AUG 74.8 70.7 67.4 14.6 12.1 9.0 2007.6673 SEP 75.7 71.0 67.5 14.1 11.7 8.7 2007.7507 OCT 76.7 71.5 67.6 13.6 11.3 8.4 2007.8340 NOV 78.3 72.0 67.9 13.2 10.9 8.2 2007.9173 DEC 79.6 72.7 68.1 12.8 10.5 7.9 2008.0007 JAN 81.1 73.3 68.2 12.4 10.2 7.7 2008.0840 FEB 83.4 74.2 68.2 12.1 9.9 7.5 2008.1673 MAR 86.5 75.1 68.3 11.8 9.6 7.3 2008.2507 APR 91.3 76.3 68.3 11.6 9.4 7.2 2008.3340 MAY 95.8 77.7 68.3 11.4 9.2 7.1 2008.4173 JUN 99.3 79.1 68.6 11.2 9.1 7.0 2008.5007 JUL 104.6 80.8 68.6 11.1 9.0 6.9 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