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% 2008.3333 MAY 71.0 69.9 68.9 7.8 7.3 6.8 2008.4167 JUN 71.7 70.0 68.3 8.5 7.4 6.2 2008.5000 JUL 72.0 70.1 67.7 9.1 7.6 5.9 2008.5833 AUG 72.5 70.3 67.2 9.7 7.7 6.0 2008.6667 SEP 73.8 70.7 66.9 10.9 8.1 6.4 2008.7500 OCT 75.3 71.2 66.7 12.8 8.6 6.9 2008.8333 NOV 76.6 71.7 66.4 14.0 9.1 7.5 2008.9167 DEC 78.3 72.4 66.2 14.8 9.5 7.5 2009.0000 JAN 80.1 73.4 66.1 15.7 10.1 7.7 2009.0833 FEB 82.3 74.2 66.0 16.2 10.5 7.6 2009.1667 MAR 86.3 75.3 65.7 16.3 10.6 7.6 2009.2500 APR 89.6 76.4 65.8 16.7 10.7 7.7 2009.3333 MAY 91.9 77.8 66.3 17.0 10.8 7.9 2009.4167 JUN 93.8 79.4 67.0 17.2 11.1 8.3 2009.5000 JUL 95.8 81.3 68.1 17.5 11.5 8.6 2009.5833 AUG 100.2 83.1 69.2 17.9 12.0 9.2 2009.6667 SEP 106.3 85.2 70.0 18.1 12.5 9.7 2009.7500 OCT 113.0 87.5 70.9 17.8 13.0 10.0 2009.8333 NOV 120.0 90.3 72.2 17.2 13.3 10.3 2009.9167 DEC 126.3 92.8 73.4 17.0 13.5 10.5 2010.0000 JAN 131.8 94.8 74.1 17.1 13.8 10.6 2010.0833 FEB 137.8 97.1 75.0 17.3 14.0 10.6 2010.1667 MAR 145.0 99.5 77.2 17.9 14.2 10.3 2010.2500 APR 152.4 102.0 79.9 18.4 14.3 10.2 2010.3333 MAY 159.6 104.5 81.8 18.7 14.3 10.0 2010.4167 JUN 168.1 107.4 82.2 18.9 13.9 9.3 2010.5000 JUL 173.3 111.2 83.5 19.1 14.0 9.4 2010.5833 AUG 178.4 115.0 84.7 19.3 14.1 9.5 2010.6667 SEP 183.6 118.8 86.0 19.5 14.1 9.6 2010.7500 OCT 188.6 122.5 87.2 19.7 14.2 9.7 2010.8333 NOV 193.6 126.1 88.4 19.9 14.2 9.8 2010.9167 DEC 198.4 129.7 89.6 20.1 14.3 9.9 2011.0000 JAN 203.1 133.1 90.7 20.3 14.3 10.0 2011.0833 FEB 207.6 136.4 91.8 20.5 14.4 10.1 2011.1667 MAR 212.0 139.6 92.9 20.7 14.4 10.2 2011.2500 APR 216.1 142.6 93.9 20.9 14.5 10.3 2011.3333 MAY 220.0 145.5 94.8 21.0 14.5 10.4 2011.4167 JUN 223.7 148.2 95.7 21.2 14.6 10.4 2011.5000 JUL 227.0 150.6 96.5 21.3 14.6 10.5 2011.5833 AUG 230.1 152.9 97.3 21.5 14.6 10.6 2011.6667 SEP 232.8 154.8 97.9 21.6 14.7 10.6 2011.7500 OCT 235.1 156.6 98.5 21.7 14.7 10.7 2011.8333 NOV 237.1 158.0 99.0 21.8 14.7 10.7 2011.9167 DEC 238.7 159.2 99.4 21.8 14.7 10.8 2012.0000 JAN 239.9 160.1 99.6 21.9 14.8 10.8 2012.0833 FEB 240.6 160.6 99.8 21.9 14.8 10.8 2012.1667 MAR 240.8 160.8 99.9 21.9 14.8 10.8 2012.2500 APR 237.9 159.6 98.5 20.6 14.9 11.5 2012.3333 MAY 233.7 157.8 97.8 20.2 15.0 11.8 2012.4167 JUN 229.9 156.0 96.7 19.7 15.1 11.7 2012.5000 JUL 228.6 154.7 95.4 19.4 15.3 11.9 2012.5833 AUG 228.6 153.6 93.8 19.2 15.6 12.1 2012.6667 SEP 227.1 152.7 92.6 19.0 15.7 11.6 2012.7500 OCT 225.2 151.7 91.8 19.0 15.7 10.9 2012.8333 NOV 224.4 150.4 91.2 18.9 15.7 10.8 2012.9167 DEC 223.6 148.9 90.3 19.0 15.7 10.8 2013.0000 JAN 222.8 147.2 89.3 19.2 15.8 10.8 2013.0833 FEB 221.6 145.3 88.6 19.8 15.9 10.8 2013.1667 MAR 217.7 143.4 87.7 20.4 16.1 10.9 2013.2500 APR 214.3 141.8 86.2 21.4 16.3 10.8 2013.3333 MAY 211.4 140.6 85.4 21.9 16.5 10.7 2013.4167 JUN 207.1 139.5 84.9 21.6 16.6 10.6 2013.5000 JUL 206.7 138.5 84.0 21.3 16.4 10.3 2013.5833 AUG 206.0 137.4 82.7 21.8 16.5 10.3 2013.6667 SEP 203.8 135.6 81.3 23.1 16.7 10.4 2013.7500 OCT 200.3 133.6 80.4 23.3 16.9 10.9 2013.8333 NOV 196.2 131.5 79.8 22.7 17.0 11.7 2013.9167 DEC 191.2 129.6 79.1 22.6 17.0 11.8 2014.0000 JAN 185.0 127.8 78.4 22.7 16.9 11.9 2014.0833 FEB 179.1 126.3 77.5 23.2 17.1 12.0 2014.1667 MAR 178.4 125.2 76.5 23.9 17.3 12.1 2014.2500 APR 177.7 123.7 75.5 23.9 17.2 12.5 2014.3333 MAY 175.3 121.6 74.6 23.9 17.1 13.3 2014.4167 JUN 171.4 119.5 73.6 23.3 17.0 13.7 2014.5000 JUL 166.1 117.5 72.7 21.6 16.8 13.3 2014.5833 AUG 161.9 115.9 72.3 21.8 16.6 12.8 2014.6667 SEP 160.4 114.4 72.0 21.8 16.4 12.7 2014.7500 OCT 159.3 112.9 71.6 21.5 16.4 12.5 2014.8333 NOV 157.5 111.4 71.4 21.1 16.4 12.4 2014.9167 DEC 154.7 109.9 71.5 20.5 16.4 12.2 2015.0000 JAN 150.5 108.3 71.4 19.9 16.1 11.9 2015.0833 FEB 144.9 106.7 71.2 20.1 16.0 11.9 2015.1667 MAR 138.7 104.8 70.9 21.6 15.9 11.7 2015.2500 APR 132.9 103.0 70.7 23.2 15.8 11.7 2015.3333 MAY 128.3 101.4 70.5 24.0 15.8 11.5 2015.4167 JUN 124.5 99.9 70.7 25.1 15.7 11.3 2015.5000 JUL 121.4 98.7 71.1 25.8 15.7 11.3 2015.5833 AUG 119.3 97.7 71.2 25.0 15.6 10.8 2015.6667 SEP 119.4 96.7 71.4 25.0 15.6 10.3 2015.7500 OCT 119.0 95.6 71.2 24.1 15.7 10.7 2015.8333 NOV 117.9 94.3 70.7 22.2 15.7 10.8 2015.9167 DEC 117.2 93.0 70.3 21.4 15.6 10.8 2016.0000 JAN 116.2 91.9 69.9 21.7 15.8 11.0 2016.0833 FEB 116.4 91.1 69.6 22.4 16.0 11.2 2016.1667 MAR 116.7 90.2 69.2 22.6 16.0 11.2 2016.2500 APR 116.8 89.2 69.0 22.5 16.1 11.0 2016.3333 MAY 116.6 88.2 68.7 22.7 16.3 11.0 2016.4167 JUN 115.9 87.1 68.2 22.9 16.6 11.3 2016.5000 JUL 114.8 86.1 68.0 23.4 16.8 11.2 2016.5833 AUG 113.1 85.1 67.8 24.1 16.9 11.2 2016.6667 SEP 109.9 84.2 67.7 24.8 17.0 11.8 2016.7500 OCT 104.9 83.2 67.6 25.4 16.9 12.2 2016.8333 NOV 99.4 82.3 67.6 25.6 16.7 12.1 2016.9167 DEC 98.8 81.3 67.5 25.4 16.4 12.0 2017.0000 JAN 99.6 80.6 67.3 24.7 16.0 12.2 2017.0833 FEB 100.2 80.0 67.2 23.6 15.6 12.3 2017.1667 MAR 98.7 79.4 67.2 22.8 15.2 12.2 2017.2500 APR 95.8 78.8 67.2 22.4 14.9 11.8 2017.3333 MAY 93.0 78.2 67.2 21.9 14.6 11.2 2017.4167 JUN 91.3 77.8 67.1 21.6 14.2 10.7 2017.5000 JUL 91.5 77.2 67.1 20.9 13.8 10.0 2017.5833 AUG 91.4 76.6 67.0 20.0 13.4 9.4 2017.6667 SEP 90.9 76.0 67.0 18.7 13.1 9.0 2017.7500 OCT 90.4 75.6 67.0 18.2 12.8 8.5 2017.8333 NOV 89.7 75.1 67.0 18.7 12.6 8.0 2017.9167 DEC 88.8 74.7 67.1 18.7 12.5 7.8 2018.0000 JAN 88.1 74.4 67.3 18.4 12.4 7.4 2018.0833 FEB 87.2 74.0 67.4 18.4 12.2 7.0 2018.1667 MAR 85.9 73.7 67.5 18.8 12.1 6.6 2018.2500 APR 84.4 73.2 67.6 18.9 12.0 6.5 2018.3333 MAY 82.3 72.7 67.7 18.8 12.0 6.4 2018.4167 JUN 80.0 72.3 67.7 18.4 11.9 6.6 2018.5000 JUL 77.7 71.9 68.0 17.5 11.8 6.9 2018.5833 AUG 76.9 71.7 68.0 16.5 11.7 7.2 2018.6667 SEP 76.5 71.5 68.0 16.3 11.6 7.4 2018.7500 OCT 75.8 71.4 68.0 16.6 11.6 7.5 2018.8333 NOV 76.0 71.3 67.9 16.9 11.6 7.5 2018.9167 DEC 76.0 71.2 67.9 17.2 11.6 7.7 2019.0000 JAN 76.3 71.2 67.7 17.3 11.6 7.7 2019.0833 FEB 76.8 71.3 67.6 17.7 11.5 7.6 2019.1667 MAR 77.8 71.5 67.7 18.0 11.4 7.6 2019.2500 APR 79.5 71.9 67.6 18.2 11.4 7.6 2019.3333 MAY 81.5 72.3 67.6 18.1 11.3 7.6 2019.4167 JUN 83.2 72.6 67.7 17.8 11.2 7.5 2019.5000 JUL 85.4 73.2 67.9 17.3 11.1 7.5 2019.5833 AUG 88.2 74.0 68.1 16.3 11.0 7.5 2019.6667 SEP 91.0 74.9 68.5 15.5 10.9 7.5 2019.7500 OCT 93.8 75.8 68.6 16.1 10.8 7.7 2019.8333 NOV 96.7 76.9 68.8 16.3 10.8 7.7 2019.9167 DEC 100.7 78.4 69.1 16.6 10.9 7.8 2020.0000 JAN 105.5 80.0 69.3 16.7 11.0 7.7 2020.0833 FEB 111.4 81.8 69.6 16.8 11.1 7.7 2020.1667 MAR 116.6 83.6 70.2 17.1 11.1 7.8 2020.2500 APR 120.6 85.6 71.1 17.3 11.1 8.0 2020.3333 MAY 123.8 87.7 71.8 17.3 11.2 8.3 2020.4167 JUN 126.5 89.8 72.5 17.4 11.5 8.6 2020.5000 JUL 130.1 92.1 73.7 17.6 11.7 9.0 2020.5833 AUG 133.5 94.4 74.2 17.5 12.0 8.8 2020.6667 SEP 136.2 96.7 74.5 16.9 12.2 8.7 2020.7500 OCT 141.6 99.5 74.8 16.2 12.4 8.9 2020.8333 NOV 147.9 102.3 75.1 16.0 12.5 9.0 2020.9167 DEC 153.4 104.8 75.3 16.0 12.7 9.0 2021.0000 JAN 157.1 107.3 75.2 16.1 12.9 8.8 2021.0833 FEB 159.2 109.6 75.2 16.7 13.0 8.4 2021.1667 MAR 162.0 111.9 75.3 17.1 13.0 8.2 2021.2500 APR 165.3 114.5 75.7 17.5 13.1 8.2 2021.3333 MAY 172.5 117.4 76.1 18.2 13.2 8.1 2021.4167 JUN 181.4 120.5 76.6 18.5 13.2 7.9 2021.5000 JUL 188.0 123.1 77.5 18.5 13.1 7.8 2021.5833 AUG 191.8 125.3 78.3 18.7 13.1 7.9 2021.6667 SEP 194.8 127.4 78.6 19.0 13.2 8.1 2021.7500 OCT 197.7 129.3 79.6 18.6 13.3 8.6 2021.8333 NOV 201.4 131.0 80.8 17.8 13.3 9.2 2021.9167 DEC 206.7 132.7 82.2 18.1 13.4 9.6 2022.0000 JAN 211.5 134.8 84.1 18.9 13.5 10.1 2022.0833 FEB 214.4 137.2 85.4 19.1 13.6 10.1 2022.1667 MAR 218.4 139.6 86.3 19.5 13.9 10.3 2022.2500 APR 223.8 142.2 88.1 20.5 14.1 10.4 2022.3333 MAY 227.1 144.8 90.0 20.2 14.1 10.6 2022.4167 JUN 228.9 146.9 91.1 20.4 14.1 10.2 2022.5000 JUL 230.4 148.9 93.3 20.7 14.1 10.2 2022.5833 AUG 231.8 150.9 95.7 21.1 14.2 9.9 2022.6667 SEP 234.4 152.8 97.5 21.4 14.2 9.8 2022.7500 OCT 237.7 154.7 98.7 21.4 14.4 10.5 2022.8333 NOV 239.4 156.3 98.8 21.6 14.5 10.9 2022.9167 DEC 238.3 157.5 98.2 21.9 14.7 10.9 2023.0000 JAN 237.2 158.9 97.8 22.4 14.9 11.0 2023.0833 FEB 238.5 160.7 99.1 22.9 15.1 11.2