TABLE 5 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 75.0% 50% 5.0% 75.0% 50% 5.0% 2003.0007 JAN 147.7 146.3 143.9 17.8 17.1 16.2 2003.0840 FEB 144.3 142.3 137.7 18.0 16.9 15.6 2003.1673 MAR 141.7 139.2 133.0 18.8 16.6 14.6 2003.2507 APR 138.4 136.6 128.8 19.6 16.6 14.3 2003.3340 MAY 135.9 134.1 125.5 20.4 16.8 13.9 2003.4173 JUN 134.9 131.9 122.4 20.8 17.1 13.3 2003.5007 JUL 133.8 129.3 119.1 21.0 17.3 13.6 2003.5840 AUG 130.9 126.7 116.3 21.6 17.5 14.1 2003.6673 SEP 127.8 124.4 112.8 22.2 17.6 13.9 2003.7507 OCT 125.6 122.0 108.9 22.3 17.5 13.7 2003.8340 NOV 123.2 118.8 105.0 22.2 17.4 13.9 2003.9173 DEC 120.1 115.8 102.2 22.5 17.2 13.5 2004.0007 JAN 118.0 114.1 100.6 22.8 17.3 13.6 2004.0840 FEB 117.5 113.2 100.2 23.0 17.5 13.5 2004.1673 MAR 117.6 112.1 99.6 22.4 17.6 13.6 2004.2507 APR 116.9 111.2 99.2 21.5 17.4 13.3 2004.3340 MAY 116.1 110.0 98.7 21.6 17.1 12.7 2004.4173 JUN 113.4 108.3 97.1 21.8 16.8 12.3 2004.5007 JUL 110.8 106.2 94.7 21.4 16.6 12.5 2004.5840 AUG 109.8 104.2 92.6 21.6 16.6 13.2 2004.6673 SEP 109.0 102.1 91.0 21.9 16.7 13.0 2004.7507 OCT 105.8 100.0 90.3 21.8 16.7 12.8 2004.8340 NOV 102.0 98.2 89.7 21.8 16.5 12.8 2004.9173 DEC 100.7 97.1 88.9 22.1 16.3 13.0 2005.0007 JAN 99.5 95.7 87.7 22.4 15.9 13.0 2005.0840 FEB 98.4 93.9 85.9 22.8 15.6 12.3 2005.1673 MAR 96.9 92.6 84.8 23.5 15.4 11.8 2005.2507 APR 95.4 91.2 83.8 24.3 15.3 11.4 2005.3340 MAY 93.9 89.9 82.8 24.9 15.3 11.2 2005.4173 JUN 92.4 88.6 81.7 25.1 15.3 11.2 2005.5007 JUL 91.0 87.3 80.7 25.1 15.2 10.8 2005.5840 AUG 89.5 86.0 79.7 24.6 15.1 10.8 2005.6673 SEP 88.1 84.7 78.7 23.6 14.9 10.8 2005.7507 OCT 86.7 83.5 77.7 22.6 14.8 10.8 2005.8340 NOV 85.4 82.3 76.8 22.0 14.8 10.6 2005.9173 DEC 84.1 81.1 75.9 21.5 14.9 10.2 2006.0007 JAN 82.8 80.0 75.0 21.0 15.1 10.2 2006.0840 FEB 81.6 78.9 74.1 20.5 15.2 10.4 2006.1673 MAR 80.4 77.8 73.3 19.8 15.1 10.7 2006.2507 APR 79.3 76.8 72.5 18.9 14.9 10.6 2006.3340 MAY 78.2 75.9 71.8 17.9 14.7 10.9 2006.4173 JUN 77.2 75.0 71.1 18.3 14.6 10.8 2006.5007 JUL 76.3 74.1 70.4 18.1 14.4 10.6 2006.5840 AUG 75.4 73.4 69.8 17.6 14.3 10.5 2006.6673 SEP 74.6 72.7 69.2 16.9 14.3 10.5 2006.7507 OCT 73.9 72.0 68.7 16.2 14.3 10.7 2006.8340 NOV 73.3 71.4 68.3 16.3 14.2 10.9 2006.9173 DEC 72.7 71.0 67.9 16.5 14.1 10.4 2007.0007 JAN 72.3 70.5 67.6 16.9 14.0 10.2 2007.0840 FEB 71.9 70.2 67.3 17.2 14.0 10.1 2007.1673 MAR 71.6 70.0 67.2 17.4 13.9 10.1 2007.2507 APR 71.5 69.8 67.0 16.8 13.4 9.8 2007.3340 MAY 71.4 69.8 67.0 16.3 13.0 9.5 2007.4173 JUN 71.6 69.9 67.1 15.7 12.6 9.2 2007.5007 JUL 72.2 70.3 67.3 15.2 12.2 9.0 2007.5840 AUG 73.0 70.7 67.4 14.7 11.8 8.7 2007.6673 SEP 73.0 71.0 67.5 14.2 11.4 8.5 2007.7507 OCT 73.1 71.5 67.6 13.7 11.0 8.2 2007.8340 NOV 73.7 72.0 67.9 13.3 10.7 8.0 2007.9173 DEC 74.4 72.7 68.1 12.9 10.4 7.8 2008.0007 JAN 75.5 73.3 68.2 12.5 10.1 7.6 2008.0840 FEB 77.1 74.2 68.2 12.1 9.8 7.4 2008.1673 MAR 78.6 75.1 68.3 11.8 9.6 7.3 2008.2507 APR 80.4 76.3 68.3 11.6 9.4 7.2 2008.3340 MAY 82.8 77.7 68.3 11.4 9.2 7.0 2008.4173 JUN 85.8 79.1 68.6 11.2 9.1 7.0 2008.5007 JUL 88.3 80.8 68.6 11.1 9.0 6.9 2008.5840 AUG 91.6 82.8 68.7 11.1 9.0 6.9 2008.6673 SEP 95.3 84.9 68.9 11.3 9.1 6.9 2008.7507 OCT 98.0 87.2 68.9 11.6 9.3 7.1 2008.8340 NOV 99.9 89.6 69.0 11.7 9.4 7.4 2008.9173 DEC 104.0 92.2 69.4 11.9 9.5 7.5 2009.0007 JAN 107.7 95.0 69.8 12.0 9.6 7.5 2009.0840 FEB 111.6 97.8 70.1 12.1 9.6 7.3 2009.1673 MAR 116.0 100.6 70.8 12.2 9.7 7.2 2009.2507 APR 118.5 103.3 71.2 12.6 9.8 7.0 2009.3340 MAY 119.9 106.3 71.4 12.9 10.1 6.9 2009.4173 JUN 123.2 109.5 72.1 13.3 10.5 7.1 2009.5007 JUL 128.2 112.8 72.7 13.8 10.8 7.5 2009.5840 AUG 132.8 115.9 73.3 14.6 11.1 7.8 2009.6673 SEP 136.2 119.0 74.0 15.8 11.4 7.6 2009.7507 OCT 141.6 122.2 74.3 16.2 11.6 7.6 2009.8340 NOV 148.4 125.1 74.6 16.4 11.7 7.5 2009.9173 DEC 153.1 127.5 75.0 16.9 11.9 7.5 2010.0007 JAN 158.1 129.7 75.3 18.1 12.2 7.5 2010.0840 FEB 163.8 131.9 75.5 19.0 12.6 7.6 2010.1673 MAR 169.7 134.3 75.5 19.2 12.8 7.6 2010.2507 APR 175.0 136.8 75.1 19.3 13.0 7.7 2010.3340 MAY 180.6 139.1 74.9 19.1 13.2 7.6 2010.4173 JUN 183.7 141.2 75.2 18.7 13.3 7.6 2010.5007 JUL 186.3 143.1 75.5 18.6 13.3 7.7 2010.5840 AUG 187.1 144.9 76.3 19.0 13.5 7.9 2010.6673 SEP 186.9 146.5 77.5 18.9 13.6 8.1 2010.7507 OCT 186.1 147.9 78.2 17.9 13.6 8.5 2010.8340 NOV 186.2 148.8 79.1 18.0 13.8 8.6 2010.9173 DEC 188.5 149.7 80.7 18.6 14.1 8.6 2011.0007 JAN 191.5 150.1 82.6 19.2 14.3 8.9 2011.0840 FEB 192.9 150.5 84.7 19.7 14.8 9.3 2011.1673 MAR 193.3 150.8 85.9 20.4 15.1 9.5 2011.2507 APR 193.1 151.0 86.9 20.4 15.2 9.5 2011.3340 MAY 191.2 151.2 88.8 20.4 15.2 9.7 2011.4173 JUN 187.8 150.6 90.2 20.6 15.2 9.9 2011.5007 JUL 183.4 149.2 92.2 20.9 15.4 10.4 2011.5840 AUG 179.2 148.1 93.5 21.3 15.4 11.0 2011.6673 SEP 176.3 147.5 94.0 21.3 15.3 11.6 2011.7507 OCT 174.7 147.4 95.3 21.5 15.1 11.2 2011.8340 NOV 174.3 147.4 95.6 21.7 15.1 11.1 2011.9173 DEC 173.5 147.1 95.2 22.1 15.1 10.6 2012.0007 JAN 171.4 146.7 95.3 22.9 15.0 10.1 2012.0840 FEB 169.8 146.3 96.8 22.6 14.7 9.8 2012.1673 MAR 166.5 145.7 97.5 21.4 14.4 10.0 2012.2507 APR 161.9 145.2 97.1 20.7 14.3 10.0 2012.3340 MAY 159.6 144.8 96.3 20.1 14.2 10.2 2012.4173 JUN 157.4 144.0 96.3 19.7 14.1 10.5 2012.5007 JUL 156.1 143.0 96.8 19.6 14.1 10.5 2012.5840 AUG 155.3 141.4 95.9 19.4 14.1 10.4 2012.6673 SEP 154.4 139.8 95.4 19.2 14.4 10.4 2012.7507 OCT 152.7 138.6 96.2 19.0 14.7 10.4 2012.8340 NOV 151.2 137.6 97.2 19.0 14.9 10.2 2012.9173 DEC 149.2 136.3 96.2 19.5 14.8 9.8 2013.0007 JAN 145.8 134.6 94.6 20.5 14.9 10.1 2013.0840 FEB 143.0 132.8 93.9 22.1 15.3 10.6 2013.1673 MAR 140.7 131.4 93.6 23.5 15.6 10.6 2013.2507 APR 137.8 130.3 91.9 24.1 15.8 10.8 2013.3340 MAY 135.9 128.9 88.5 25.3 16.1 10.9 2013.4173 JUN 135.0 127.1 87.7 25.8 16.3 11.1 2013.5007 JUL 135.0 125.5 88.8 25.0 16.3 11.4 2013.5840 AUG 134.2 124.2 88.3 24.9 16.2 11.6 2013.6673 SEP 134.9 123.1 87.0 24.1 16.2 11.7 2013.7507 OCT 134.1 122.0 86.0 22.2 16.1 11.7 2013.8340 NOV 133.2 120.8 85.7 22.5 16.2 11.9 2013.9173 DEC 131.8 119.2 84.8 23.2 16.3 11.7 2014.0007 JAN 130.0 117.2 83.5 23.3 16.3 10.9 2014.0840 FEB 127.6 115.4 82.5 22.8 16.1 10.6 2014.1673 MAR 126.9 113.5 81.9 22.1 15.9 10.7 2014.2507 APR 126.3 111.5 81.9 22.0 15.9 10.7 2014.3340 MAY 124.2 109.8 81.6 22.9 16.1 10.6 2014.4173 JUN 122.6 108.3 80.4 23.8 16.4 10.7 2014.5007 JUL 121.3 106.9 80.5 24.0 16.6 10.7 2014.5840 AUG 118.9 105.4 80.2 24.0 16.8 10.6 2014.6673 SEP 116.5 103.9 79.5 24.0 16.9 10.5 2014.7507 OCT 115.5 102.4 79.0 23.6 16.9 10.2 2014.8340 NOV 114.2 100.8 78.2 22.7 16.9 10.3 2014.9173 DEC 112.1 99.3 77.1 22.9 16.8 10.5 2015.0007 JAN 108.6 98.0 75.4 23.1 16.9 11.3 2015.0840 FEB 106.6 96.9 74.3 23.2 17.2 11.8 2015.1673 MAR 105.3 95.9 73.6 22.6 17.3 11.9 2015.2507 APR 104.5 95.0 72.8 21.6 17.2 12.1 2015.3340 MAY 102.6 94.0 71.8 21.3 17.1 12.2 2015.4173 JUN 100.8 92.9 71.3 21.8 16.9 12.4 2015.5007 JUL 99.3 91.8 70.8 21.8 16.7 13.2 2015.5840 AUG 98.4 90.7 70.4 22.2 16.8 13.0 2015.6673 SEP 98.4 89.5 70.3 22.6 16.9 12.7 2015.7507 OCT 98.1 88.2 70.4 22.4 16.9 13.0 2015.8340 NOV 97.5 87.3 70.2 22.4 16.7 12.7 2015.9173 DEC 96.0 86.6 70.1 22.8 16.5 12.4 2016.0007 JAN 95.0 85.8 70.2 23.0 16.1 12.0 2016.0840 FEB 93.5 84.7 70.1 23.6 15.8 11.1 2016.1673 MAR 91.1 83.6 70.3 24.2 15.6 10.4 2016.2507 APR 89.8 82.5 69.8 25.0 15.5 10.5 2016.3340 MAY 88.4 81.8 69.6 25.5 15.5 10.6 2016.4173 JUN 86.8 81.0 69.4 25.7 15.5 10.5 2016.5007 JUL 86.1 80.3 69.3 25.6 15.4 10.6 2016.5840 AUG 85.4 79.5 69.0 25.0 15.3 10.9 2016.6673 SEP 84.3 78.8 68.7 24.1 15.1 11.0 2016.7507 OCT 83.0 78.1 68.4 23.1 14.9 11.2 2016.8340 NOV 81.9 77.5 68.3 22.6 15.0 11.1 2016.9173 DEC 81.3 77.0 68.3 22.2 15.2 11.0 2017.0007 JAN 81.0 76.4 68.2 21.9 15.4 11.1 2017.0840 FEB 80.0 75.9 68.0 21.5 15.5 11.3 2017.1673 MAR 79.5 75.4 67.7 20.8 15.5 11.4 2017.2507 APR 78.2 74.8 67.5 20.0 15.3 11.4 2017.3340 MAY 77.4 74.2 67.6 20.1 15.1 11.7 2017.4173 JUN 76.8 73.5 67.4 20.2 14.9 11.9 2017.5007 JUL 75.9 72.9 67.3 19.9 14.7 11.6 2017.5840 AUG 75.6 72.4 67.2 19.5 14.6 11.5 2017.6673 SEP 74.8 72.0 67.2 19.0 14.6 11.1 2017.7507 OCT 73.7 71.6 67.2 18.2 14.6 10.6 2017.8340 NOV 73.5 71.3 67.1 17.3 14.5 9.8 2017.9173 DEC 72.6 71.0 67.1 17.4 14.4 9.4 2018.0007 JAN 72.4 70.7 67.0 17.5 14.3 9.3 2018.0840 FEB 72.4 70.4 67.0 17.6 14.2 9.3 2018.1673 MAR 72.0 70.1 67.0 17.6 14.1 9.3