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% 2007.0833 FEB 78.7 78.3 76.5 9.1 8.8 8.1 2007.1667 MAR 79.8 79.0 75.8 9.4 8.7 7.5 2007.2500 APR 81.0 79.9 75.6 9.8 8.6 7.2 2007.3333 MAY 82.5 81.1 75.4 10.3 8.6 7.1 2007.4167 JUN 84.5 82.6 75.8 10.6 8.7 7.1 2007.5000 JUL 86.8 84.4 76.2 10.9 8.8 6.7 2007.5833 AUG 89.3 86.7 76.9 11.4 8.9 6.8 2007.6667 SEP 92.5 89.5 77.9 12.4 9.1 7.2 2007.7500 OCT 95.8 92.5 79.1 14.0 9.5 7.5 2007.8333 NOV 99.2 95.5 80.3 15.0 9.8 8.0 2007.9167 DEC 101.6 97.8 81.2 15.5 10.0 7.9 2008.0000 JAN 103.8 100.1 82.2 16.1 10.4 7.9 2008.0833 FEB 106.6 102.5 83.4 16.4 10.7 7.8 2008.1667 MAR 109.7 105.1 84.4 16.6 10.8 7.7 2008.2500 APR 113.6 107.7 85.8 17.0 10.9 7.8 2008.3333 MAY 118.9 110.7 87.7 17.2 11.0 8.0 2008.4167 JUN 124.9 114.2 89.8 17.3 11.3 8.3 2008.5000 JUL 129.3 117.2 91.9 17.6 11.6 8.6 2008.5833 AUG 132.8 120.1 93.9 17.9 12.0 9.0 2008.6667 SEP 135.5 122.2 95.1 18.0 12.5 9.6 2008.7500 OCT 136.4 123.5 95.8 17.5 12.8 10.0 2008.8333 NOV 137.3 125.1 97.6 16.8 13.0 10.0 2008.9167 DEC 139.0 127.6 100.3 16.5 13.1 10.0 2009.0000 JAN 140.6 130.1 101.9 16.5 13.3 10.0 2009.0833 FEB 142.8 132.2 102.8 17.0 13.5 9.9 2009.1667 MAR 145.3 135.0 105.7 17.6 13.6 9.5 2009.2500 APR 150.2 138.4 110.0 18.1 13.7 9.4 2009.3333 MAY 154.0 141.1 113.3 18.4 13.7 9.2 2009.4167 JUN 155.1 143.0 116.2 18.5 13.4 8.6 2009.5000 JUL 157.8 144.3 115.0 18.7 13.5 8.7 2009.5833 AUG 160.4 145.5 113.9 19.0 13.6 8.9 2009.6667 SEP 163.1 146.8 112.7 19.2 13.7 9.0 2009.7500 OCT 165.7 148.0 111.6 19.5 13.8 9.2 2009.8333 NOV 168.2 149.2 110.5 19.7 13.9 9.3 2009.9167 DEC 170.7 150.4 109.4 19.9 14.0 9.5 2010.0000 JAN 173.1 151.6 108.3 20.1 14.1 9.6 2010.0833 FEB 175.4 152.7 107.3 20.4 14.2 9.8 2010.1667 MAR 177.7 153.7 106.3 20.6 14.2 9.9 2010.2500 APR 179.8 154.7 105.4 20.7 14.3 10.0 2010.3333 MAY 181.8 155.7 104.5 20.9 14.4 10.2 2010.4167 JUN 183.7 156.6 103.7 21.1 14.5 10.3 2010.5000 JUL 185.4 157.4 103.0 21.3 14.5 10.4 2010.5833 AUG 187.0 158.1 102.3 21.4 14.6 10.5 2010.6667 SEP 188.4 158.8 101.7 21.5 14.6 10.5 2010.7500 OCT 189.6 159.4 101.2 21.6 14.7 10.6 2010.8333 NOV 190.6 159.9 100.7 21.7 14.7 10.7 2010.9167 DEC 191.4 160.3 100.4 21.8 14.7 10.7 2011.0000 JAN 192.0 160.5 100.1 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