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% 2006.9167 DEC 78.5 78.2 77.1 9.4 8.9 8.3 2007.0000 JAN 79.0 78.4 76.2 10.1 9.0 7.8 2007.0833 FEB 79.7 78.8 75.0 10.6 9.1 7.3 2007.1667 MAR 80.4 79.2 74.1 11.0 9.1 6.9 2007.2500 APR 81.3 79.8 73.6 11.4 9.1 6.6 2007.3333 MAY 82.5 80.8 73.4 11.9 9.1 6.6 2007.4167 JUN 84.0 82.1 73.3 12.3 9.2 6.7 2007.5000 JUL 85.7 83.7 73.3 12.4 9.2 7.1 2007.5833 AUG 87.9 85.9 73.6 12.4 9.3 7.3 2007.6667 SEP 90.9 88.4 74.2 13.2 9.5 7.7 2007.7500 OCT 93.7 91.2 74.8 14.6 9.8 8.0 2007.8333 NOV 97.4 93.9 75.4 15.5 10.0 8.0 2007.9167 DEC 100.9 96.0 76.2 15.9 10.2 7.9 2008.0000 JAN 103.6 98.1 77.2 16.4 10.6 7.9 2008.0833 FEB 106.4 100.3 78.2 16.6 10.9 7.7 2008.1667 MAR 109.5 102.5 79.0 16.8 11.0 7.7 2008.2500 APR 112.9 104.8 80.3 17.1 11.1 7.8 2008.3333 MAY 116.7 107.4 81.8 17.4 11.2 8.0 2008.4167 JUN 119.9 110.6 83.5 17.4 11.4 8.2 2008.5000 JUL 123.8 113.4 85.1 17.6 11.7 8.5 2008.5833 AUG 128.3 116.1 86.7 17.9 12.1 9.0 2008.6667 SEP 131.4 118.1 88.3 17.9 12.6 9.5 2008.7500 OCT 132.4 119.3 89.9 17.3 12.9 10.2 2008.8333 NOV 134.0 120.9 92.2 16.6 13.0 10.1 2008.9167 DEC 136.5 123.4 95.1 16.3 13.0 10.0 2009.0000 JAN 139.0 126.0 96.8 16.4 13.2 9.9 2009.0833 FEB 140.5 128.3 97.6 17.0 13.3 9.7 2009.1667 MAR 142.2 131.5 100.6 17.5 13.4 9.3 2009.2500 APR 146.9 135.3 105.0 18.0 13.5 9.1 2009.3333 MAY 151.6 138.5 108.2 18.3 13.5 8.9 2009.4167 JUN 152.8 141.0 111.0 18.3 13.3 8.3 2009.5000 JUL 155.7 142.4 110.2 18.5 13.4 8.4 2009.5833 AUG 158.5 143.8 109.5 18.8 13.5 8.6 2009.6667 SEP 161.3 145.2 108.7 19.0 13.6 8.8 2009.7500 OCT 164.0 146.6 107.9 19.3 13.7 9.0 2009.8333 NOV 166.7 147.9 107.1 19.5 13.8 9.1 2009.9167 DEC 169.4 149.2 106.4 19.8 13.9 9.3 2010.0000 JAN 171.9 150.5 105.7 20.0 14.0 9.5 2010.0833 FEB 174.4 151.7 105.0 20.2 14.1 9.6 2010.1667 MAR 176.8 152.9 104.3 20.5 14.2 9.8 2010.2500 APR 179.0 154.0 103.7 20.7 14.3 9.9 2010.3333 MAY 181.2 155.1 103.1 20.9 14.3 10.1 2010.4167 JUN 183.1 156.1 102.5 21.0 14.4 10.2 2010.5000 JUL 185.0 157.0 102.0 21.2 14.5 10.3 2010.5833 AUG 186.6 157.8 101.5 21.4 14.5 10.4 2010.6667 SEP 188.1 158.6 101.1 21.5 14.6 10.5 2010.7500 OCT 189.4 159.2 100.7 21.6 14.7 10.6 2010.8333 NOV 190.5 159.8 100.4 21.7 14.7 10.7 2010.9167 DEC 191.3 160.2 100.2 21.8 14.7 10.7 2011.0000 JAN 192.0 160.5 100.0 21.9 14.8 10.8 2011.0833 FEB 192.4 160.7 99.9 21.9 14.8 10.8 2011.1667 MAR 192.5 160.8 99.9 21.9 14.8 10.8 2011.2500 APR 193.5 159.8 98.5 20.6 14.9 11.5 2011.3333 MAY 192.2 157.8 97.8 20.2 15.0 11.8 2011.4167 JUN 189.2 156.1 96.7 19.7 15.1 11.7 2011.5000 JUL 184.9 154.9 95.4 19.4 15.3 11.9 2011.5833 AUG 180.2 153.6 93.8 19.2 15.6 12.1 2011.6667 SEP 177.5 152.2 92.6 19.0 15.7 11.6 2011.7500 OCT 175.8 150.5 91.8 19.0 15.7 10.9 2011.8333 NOV 175.4 149.0 91.2 18.9 15.7 10.8 2011.9167 DEC 173.4 147.3 90.3 19.0 15.7 10.8 2012.0000 JAN 169.3 145.5 89.3 19.2 15.8 10.8 2012.0833 FEB 166.2 143.3 88.6 19.8 15.9 10.8 2012.1667 MAR 165.9 141.5 87.7 20.4 16.1 10.9 2012.2500 APR 163.7 140.1 86.2 21.4 16.3 10.8 2012.3333 MAY 160.6 139.0 85.4 21.9 16.5 10.7 2012.4167 JUN 159.8 137.8 84.9 21.6 16.6 10.6 2012.5000 JUL 158.8 136.3 84.0 21.3 16.4 10.3 2012.5833 AUG 156.3 135.1 82.7 21.8 16.5 10.3 2012.6667 SEP 153.6 133.9 81.3 23.1 16.7 10.4 2012.7500 OCT 152.4 132.6 80.4 23.3 16.9 10.9 2012.8333 NOV 151.6 131.0 79.8 22.7 17.0 11.7 2012.9167 DEC 151.1 129.4 79.1 22.6 17.0 11.8 2013.0000 JAN 149.3 128.0 78.4 22.7 16.9 11.9 2013.0833 FEB 146.2 126.8 77.5 23.2 17.1 12.0 2013.1667 MAR 144.8 125.7 76.5 23.9 17.3 12.1 2013.2500 APR 144.9 124.2 75.5 23.9 17.2 12.5 2013.3333 MAY 143.0 122.2 74.6 23.9 17.1 13.3 2013.4167 JUN 139.7 120.3 73.6 23.3 17.0 13.7 2013.5000 JUL 135.8 118.7 72.7 21.6 16.8 13.3 2013.5833 AUG 135.2 117.4 72.3 21.8 16.6 12.8 2013.6667 SEP 133.5 116.1 72.0 21.8 16.4 12.7 2013.7500 OCT 132.8 114.5 71.6 21.5 16.4 12.5 2013.8333 NOV 130.9 112.8 71.4 21.1 16.4 12.4 2013.9167 DEC 128.9 111.0 71.5 20.5 16.4 12.2 2014.0000 JAN 125.9 109.0 71.4 19.9 16.1 11.9 2014.0833 FEB 124.1 107.1 71.2 20.1 16.0 11.9 2014.1667 MAR 122.0 105.4 70.9 21.6 15.9 11.7 2014.2500 APR 119.0 104.0 70.7 23.2 15.8 11.7 2014.3333 MAY 118.6 102.7 70.5 24.0 15.8 11.5 2014.4167 JUN 116.9 101.3 70.7 25.1 15.7 11.3 2014.5000 JUL 115.8 100.1 71.1 25.8 15.7 11.3 2014.5833 AUG 115.7 98.8 71.2 25.0 15.6 10.8 2014.6667 SEP 116.6 97.6 71.4 25.0 15.6 10.3 2014.7500 OCT 114.5 96.5 71.2 24.1 15.7 10.7 2014.8333 NOV 111.2 95.2 70.7 22.2 15.7 10.8 2014.9167 DEC 109.4 94.0 70.3 21.4 15.6 10.8 2015.0000 JAN 108.2 93.2 70.0 21.7 15.8 11.0 2015.0833 FEB 106.7 92.5 69.6 22.4 16.0 11.2 2015.1667 MAR 104.8 91.5 69.2 22.6 16.0 11.2 2015.2500 APR 102.8 90.4 69.0 22.5 16.1 11.0 2015.3333 MAY 101.2 89.3 68.7 22.7 16.3 11.0 2015.4167 JUN 99.4 88.2 68.2 22.9 16.6 11.3 2015.5000 JUL 97.8 87.0 68.0 23.4 16.8 11.2 2015.5833 AUG 96.1 85.9 67.8 24.1 16.9 11.2 2015.6667 SEP 94.5 84.8 67.7 24.8 17.0 11.8 2015.7500 OCT 93.1 83.7 67.6 25.4 16.9 12.2 2015.8333 NOV 92.0 82.8 67.6 25.6 16.7 12.1 2015.9167 DEC 90.9 81.8 67.5 25.4 16.4 12.0 2016.0000 JAN 90.0 80.9 67.3 24.7 16.0 12.2 2016.0833 FEB 89.1 80.2 67.2 23.6 15.6 12.3 2016.1667 MAR 88.6 79.6 67.2 22.8 15.2 12.2 2016.2500 APR 87.4 78.9 67.2 22.4 14.9 11.8 2016.3333 MAY 86.0 78.4 67.2 21.9 14.6 11.2 2016.4167 JUN 85.4 77.9 67.1 21.6 14.2 10.7 2016.5000 JUL 84.6 77.3 67.1 20.9 13.8 10.0 2016.5833 AUG 83.4 76.8 67.0 20.0 13.4 9.4 2016.6667 SEP 82.1 76.2 67.0 18.7 13.1 9.0 2016.7500 OCT 81.0 75.7 67.0 18.2 12.8 8.5 2016.8333 NOV 80.1 75.2 67.0 18.7 12.6 8.0 2016.9167 DEC 78.9 74.9 67.1 18.7 12.5 7.8 2017.0000 JAN 78.2 74.6 67.3 18.4 12.4 7.4 2017.0833 FEB 77.7 74.2 67.4 18.4 12.2 7.0 2017.1667 MAR 76.9 73.9 67.5 18.8 12.1 6.6 2017.2500 APR 76.0 73.6 67.6 18.9 12.0 6.5 2017.3333 MAY 75.4 73.1 67.7 18.8 12.0 6.4 2017.4167 JUN 75.0 72.7 67.7 18.4 11.9 6.6 2017.5000 JUL 75.0 72.3 68.0 17.5 11.8 6.9 2017.5833 AUG 75.2 72.1 68.0 16.5 11.7 7.2 2017.6667 SEP 74.8 71.9 68.0 16.3 11.6 7.4 2017.7500 OCT 73.9 71.7 68.0 16.6 11.6 7.5 2017.8333 NOV 73.8 71.6 67.9 16.9 11.6 7.5 2017.9167 DEC 73.6 71.7 67.9 17.2 11.6 7.7 2018.0000 JAN 73.2 71.8 67.7 17.3 11.6 7.7 2018.0833 FEB 73.2 72.0 67.6 17.7 11.5 7.6 2018.1667 MAR 73.6 72.3 67.7 18.0 11.4 7.6 2018.2500 APR 73.6 72.6 67.6 18.2 11.4 7.6 2018.3333 MAY 74.0 73.0 67.6 18.1 11.3 7.6 2018.4167 JUN 74.0 73.4 67.7 17.8 11.2 7.5 2018.5000 JUL 74.6 74.1 67.9 17.3 11.1 7.5 2018.5833 AUG 75.6 75.0 68.1 16.3 11.0 7.5 2018.6667 SEP 77.0 76.1 68.5 15.5 10.9 7.5 2018.7500 OCT 78.5 77.2 68.6 16.1 10.8 7.7 2018.8333 NOV 80.3 78.2 68.8 16.3 10.8 7.7 2018.9167 DEC 82.4 79.5 69.1 16.6 10.9 7.8 2019.0000 JAN 84.0 80.8 69.3 16.7 11.0 7.7 2019.0833 FEB 85.2 82.2 69.6 16.8 11.1 7.7 2019.1667 MAR 86.5 83.7 70.2 17.1 11.1 7.8 2019.2500 APR 88.7 85.5 71.1 17.3 11.1 8.0 2019.3333 MAY 92.6 87.6 71.8 17.3 11.2 8.3 2019.4167 JUN 95.0 89.7 72.5 17.4 11.5 8.6 2019.5000 JUL 97.1 91.8 73.7 17.6 11.7 9.0 2019.5833 AUG 99.1 93.8 74.2 17.5 12.0 8.8 2019.6667 SEP 101.7 95.8 74.5 16.9 12.2 8.7 2019.7500 OCT 104.4 98.2 74.8 16.2 12.4 8.9 2019.8333 NOV 106.8 100.6 75.1 16.0 12.5 9.0 2019.9167 DEC 108.5 102.6 75.3 16.0 12.7 9.0 2020.0000 JAN 111.1 104.9 75.2 16.1 12.9 8.8 2020.0833 FEB 114.6 107.3 75.2 16.7 13.0 8.4 2020.1667 MAR 116.0 109.8 75.3 17.1 13.0 8.2 2020.2500 APR 117.8 112.2 75.7 17.5 13.1 8.2 2020.3333 MAY 120.4 114.8 76.1 18.2 13.2 8.1 2020.4167 JUN 123.7 117.3 76.6 18.5 13.2 7.9 2020.5000 JUL 126.4 119.6 77.5 18.5 13.1 7.8 2020.5833 AUG 129.8 121.7 78.3 18.7 13.1 7.9 2020.6667 SEP 133.4 123.6 78.6 19.0 13.2 8.1 2020.7500 OCT 137.0 125.3 79.6 18.6 13.3 8.6 2020.8333 NOV 141.7 127.2 80.8 17.8 13.3 9.2 2020.9167 DEC 147.0 129.1 82.2 18.1 13.4 9.6 2021.0000 JAN 150.9 131.4 84.1 18.9 13.5 10.1 2021.0833 FEB 152.9 133.8 85.4 19.1 13.6 10.1 2021.1667 MAR 155.0 136.2 86.3 19.5 13.9 10.3 2021.2500 APR 159.0 138.9 88.1 20.5 14.1 10.4 2021.3333 MAY 163.4 141.5 90.0 20.2 14.1 10.6 2021.4167 JUN 167.6 143.9 91.1 20.4 14.1 10.2 2021.5000 JUL 172.9 146.5 93.3 20.7 14.1 10.2 2021.5833 AUG 178.7 149.1 95.7 21.1 14.2 9.9 2021.6667 SEP 181.8 151.4 97.5 21.4 14.2 9.8 2021.7500 OCT 184.2 153.5 98.7 21.4 14.4 10.5 2021.8333 NOV 187.0 155.6 98.8 21.6 14.5 10.9 2021.9167 DEC 189.7 157.6 98.2 21.9 14.7 10.9 2022.0000 JAN 191.8 159.7 97.8 22.4 14.9 11.0 2022.0833 FEB 192.7 161.7 99.1 22.9 15.1 11.2