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% 2005.7500 OCT 87.6 86.6 85.3 12.3 11.1 10.0 2005.8333 NOV 87.3 85.6 83.8 13.3 10.8 8.9 2005.9167 DEC 86.9 84.5 82.2 13.6 10.5 8.0 2006.0000 JAN 86.2 83.6 81.2 13.5 10.3 7.5 2006.0833 FEB 85.7 82.8 80.1 12.9 10.2 7.4 2006.1667 MAR 85.1 81.9 79.1 12.6 9.9 7.1 2006.2500 APR 84.1 81.0 78.2 12.9 9.7 6.8 2006.3333 MAY 83.1 80.1 77.2 13.1 9.7 6.7 2006.4167 JUN 82.1 78.9 75.9 13.2 9.7 6.7 2006.5000 JUL 81.5 77.7 75.1 13.2 9.7 6.7 2006.5833 AUG 81.1 76.6 74.1 12.6 9.7 7.1 2006.6667 SEP 80.6 75.8 73.0 13.6 9.8 7.3 2006.7500 OCT 80.2 75.0 72.0 14.4 9.9 7.6 2006.8333 NOV 80.4 74.3 71.2 14.8 10.0 7.7 2006.9167 DEC 80.8 73.7 70.7 15.3 10.1 7.6 2007.0000 JAN 81.8 73.2 70.0 15.8 10.3 7.5 2007.0833 FEB 83.1 72.7 69.1 16.1 10.4 7.4 2007.1667 MAR 84.4 72.4 68.3 16.5 10.5 7.3 2007.2500 APR 86.2 72.2 67.5 16.9 10.5 7.3 2007.3333 MAY 88.5 72.0 66.6 17.2 10.5 7.4 2007.4167 JUN 91.1 72.0 66.0 17.2 10.5 7.5 2007.5000 JUL 94.5 72.2 65.6 16.9 10.4 7.7 2007.5833 AUG 99.5 72.6 65.4 16.5 10.4 7.9 2007.6667 SEP 104.6 73.2 65.1 15.5 10.3 8.0 2007.7500 OCT 109.4 73.8 64.7 14.7 10.3 8.0 2007.8333 NOV 113.7 74.5 64.3 15.4 10.3 8.1 2007.9167 DEC 116.9 75.2 63.9 15.6 10.3 8.1 2008.0000 JAN 120.0 76.2 63.8 16.0 10.4 8.2 2008.0833 FEB 123.9 77.1 63.5 16.2 10.6 8.0 2008.1667 MAR 127.9 78.0 63.0 16.3 10.7 8.0 2008.2500 APR 132.2 79.0 62.8 16.7 10.8 8.0 2008.3333 MAY 137.5 80.4 62.6 17.0 10.9 8.2 2008.4167 JUN 143.1 82.0 62.5 17.1 11.1 8.4 2008.5000 JUL 147.5 83.7 62.5 17.2 11.3 8.7 2008.5833 AUG 150.9 85.7 62.8 17.5 11.7 8.9 2008.6667 SEP 153.2 87.8 63.4 17.6 12.0 9.0 2008.7500 OCT 155.0 90.0 64.1 17.0 12.3 9.0 2008.8333 NOV 157.2 92.4 64.6 16.2 12.4 8.8 2008.9167 DEC 160.7 95.0 65.5 15.8 12.3 8.5 2009.0000 JAN 164.9 97.6 66.6 15.7 12.5 8.3 2009.0833 FEB 168.8 100.5 67.8 15.5 12.6 8.1 2009.1667 MAR 174.9 103.9 69.6 15.3 12.6 7.7 2009.2500 APR 181.9 107.8 71.9 15.7 12.7 7.4 2009.3333 MAY 187.4 111.9 75.2 16.0 12.7 7.3 2009.4167 JUN 191.2 116.2 78.6 16.0 12.7 7.0 2009.5000 JUL 193.9 120.6 82.2 16.5 12.8 7.2 2009.5833 AUG 195.8 124.5 86.1 16.9 13.0 7.5 2009.6667 SEP 199.3 127.3 87.2 17.3 13.1 7.8 2009.7500 OCT 202.9 130.2 88.2 17.7 13.3 8.1 2009.8333 NOV 206.3 133.0 89.3 18.1 13.4 8.3 2009.9167 DEC 209.8 135.8 90.4 18.5 13.6 8.6 2010.0000 JAN 213.1 138.5 91.4 18.9 13.7 8.8 2010.0833 FEB 216.4 141.1 92.4 19.2 13.8 9.1 2010.1667 MAR 219.5 143.6 93.4 19.6 13.9 9.3 2010.2500 APR 222.5 146.0 94.3 19.9 14.1 9.5 2010.3333 MAY 225.4 148.3 95.1 20.2 14.2 9.7 2010.4167 JUN 228.1 150.5 96.0 20.5 14.3 9.9 2010.5000 JUL 230.5 152.5 96.7 20.8 14.4 10.1 2010.5833 AUG 232.8 154.3 97.4 21.0 14.5 10.2 2010.6667 SEP 234.8 155.9 98.0 21.3 14.5 10.4 2010.7500 OCT 236.6 157.3 98.6 21.4 14.6 10.5 2010.8333 NOV 238.0 158.5 99.0 21.6 14.7 10.6 2010.9167 DEC 239.2 159.5 99.4 21.7 14.7 10.7 2011.0000 JAN 240.1 160.2 99.7 21.8 14.7 10.7 2011.0833 FEB 240.6 160.6 99.8 21.9 14.8 10.8 2011.1667 MAR 240.8 160.8 99.9 21.9 14.8 10.8 2011.2500 APR 236.9 159.8 98.5 20.6 14.9 11.5 2011.3333 MAY 231.7 157.8 97.8 20.2 15.0 11.8 2011.4167 JUN 229.5 156.1 96.7 19.7 15.1 11.7 2011.5000 JUL 230.3 154.9 95.4 19.4 15.3 11.9 2011.5833 AUG 229.9 153.6 93.8 19.2 15.6 12.1 2011.6667 SEP 227.4 152.2 92.6 19.0 15.7 11.6 2011.7500 OCT 225.2 150.5 91.8 19.0 15.7 10.9 2011.8333 NOV 224.6 149.0 91.2 18.9 15.7 10.8 2011.9167 DEC 223.7 147.3 90.3 19.0 15.7 10.8 2012.0000 JAN 222.3 145.5 89.3 19.2 15.8 10.8 2012.0833 FEB 218.8 143.3 88.6 19.8 15.9 10.8 2012.1667 MAR 214.8 141.5 87.7 20.4 16.1 10.9 2012.2500 APR 211.5 140.1 86.2 21.4 16.3 10.8 2012.3333 MAY 206.4 139.0 85.4 21.9 16.5 10.7 2012.4167 JUN 201.5 137.8 84.9 21.6 16.6 10.6 2012.5000 JUL 196.4 136.3 84.0 21.3 16.4 10.3 2012.5833 AUG 191.5 135.1 82.7 21.8 16.5 10.3 2012.6667 SEP 192.5 133.9 81.3 23.1 16.7 10.4 2012.7500 OCT 195.5 132.6 80.4 23.3 16.9 10.9 2012.8333 NOV 196.9 131.0 79.8 22.7 17.0 11.7 2012.9167 DEC 197.5 129.4 79.1 22.6 17.0 11.8 2013.0000 JAN 198.8 128.0 78.4 22.7 16.9 11.9 2013.0833 FEB 201.3 126.8 77.5 23.2 17.1 12.0 2013.1667 MAR 202.0 125.7 76.5 23.9 17.3 12.1 2013.2500 APR 201.3 124.2 75.5 23.9 17.2 12.5 2013.3333 MAY 201.3 122.2 74.6 23.9 17.1 13.3 2013.4167 JUN 200.8 120.3 73.6 23.3 17.0 13.7 2013.5000 JUL 200.5 118.7 72.7 21.6 16.8 13.3 2013.5833 AUG 200.8 117.4 72.3 21.8 16.6 12.8 2013.6667 SEP 200.1 116.1 72.0 21.8 16.4 12.7 2013.7500 OCT 197.7 114.5 71.6 21.5 16.4 12.5 2013.8333 NOV 193.9 112.8 71.4 21.1 16.4 12.4 2013.9167 DEC 189.6 111.0 71.5 20.5 16.4 12.2 2014.0000 JAN 183.5 109.0 71.4 19.9 16.1 11.9 2014.0833 FEB 176.7 107.1 71.2 20.1 16.0 11.9 2014.1667 MAR 169.9 105.4 70.9 21.6 15.9 11.7 2014.2500 APR 163.7 104.0 70.7 23.2 15.8 11.7 2014.3333 MAY 158.4 102.7 70.5 24.0 15.8 11.5 2014.4167 JUN 154.5 101.3 70.7 25.1 15.7 11.3 2014.5000 JUL 150.7 100.1 71.1 25.8 15.7 11.3 2014.5833 AUG 144.6 98.8 71.2 25.0 15.6 10.8 2014.6667 SEP 137.6 97.6 71.4 25.0 15.6 10.3 2014.7500 OCT 132.6 96.5 71.2 24.1 15.7 10.7 2014.8333 NOV 129.3 95.2 70.7 22.2 15.7 10.8 2014.9167 DEC 127.0 94.0 70.3 21.4 15.6 10.8 2015.0000 JAN 126.3 93.2 70.0 21.7 15.8 11.0 2015.0833 FEB 125.2 92.5 69.6 22.4 16.0 11.2 2015.1667 MAR 123.2 91.5 69.2 22.6 16.0 11.2 2015.2500 APR 121.2 90.4 69.0 22.5 16.1 11.0 2015.3333 MAY 119.0 89.3 68.7 22.7 16.3 11.0 2015.4167 JUN 116.5 88.2 68.2 22.9 16.6 11.3 2015.5000 JUL 114.4 87.0 68.0 23.4 16.8 11.2 2015.5833 AUG 110.6 85.9 67.8 24.1 16.9 11.2 2015.6667 SEP 108.0 84.8 67.7 24.8 17.0 11.8 2015.7500 OCT 104.4 83.7 67.6 25.4 16.9 12.2 2015.8333 NOV 101.3 82.8 67.6 25.6 16.7 12.1 2015.9167 DEC 99.0 81.8 67.5 25.4 16.4 12.0 2016.0000 JAN 99.7 80.9 67.3 24.7 16.0 12.2 2016.0833 FEB 100.2 80.2 67.2 23.6 15.6 12.3 2016.1667 MAR 98.7 79.6 67.2 22.8 15.2 12.2 2016.2500 APR 95.8 78.9 67.2 22.4 14.9 11.8 2016.3333 MAY 93.0 78.4 67.2 21.9 14.6 11.2 2016.4167 JUN 91.3 77.9 67.1 21.6 14.2 10.7 2016.5000 JUL 91.5 77.3 67.1 20.9 13.8 10.0 2016.5833 AUG 91.4 76.8 67.0 20.0 13.4 9.4 2016.6667 SEP 90.9 76.2 67.0 18.7 13.1 9.0 2016.7500 OCT 90.4 75.7 67.0 18.2 12.8 8.5 2016.8333 NOV 89.7 75.2 67.0 18.7 12.6 8.0 2016.9167 DEC 88.8 74.9 67.1 18.7 12.5 7.8 2017.0000 JAN 88.1 74.6 67.3 18.4 12.4 7.4 2017.0833 FEB 87.2 74.2 67.4 18.4 12.2 7.0 2017.1667 MAR 85.9 73.9 67.5 18.8 12.1 6.6 2017.2500 APR 84.4 73.6 67.6 18.9 12.0 6.5 2017.3333 MAY 82.3 73.1 67.7 18.8 12.0 6.4 2017.4167 JUN 80.0 72.7 67.7 18.4 11.9 6.6 2017.5000 JUL 77.7 72.3 68.0 17.5 11.8 6.9 2017.5833 AUG 77.2 72.1 68.0 16.5 11.7 7.2 2017.6667 SEP 76.5 71.9 68.0 16.3 11.6 7.4 2017.7500 OCT 77.5 71.7 68.0 16.6 11.6 7.5 2017.8333 NOV 78.4 71.6 67.9 16.9 11.6 7.5 2017.9167 DEC 80.0 71.7 67.9 17.2 11.6 7.7 2018.0000 JAN 82.0 71.8 67.7 17.3 11.6 7.7 2018.0833 FEB 83.9 72.0 67.6 17.7 11.5 7.6 2018.1667 MAR 86.3 72.3 67.7 18.0 11.4 7.6 2018.2500 APR 89.2 72.6 67.6 18.2 11.4 7.6 2018.3333 MAY 92.3 73.0 67.6 18.1 11.3 7.6 2018.4167 JUN 95.7 73.4 67.7 17.8 11.2 7.5 2018.5000 JUL 101.0 74.1 67.9 17.3 11.1 7.5 2018.5833 AUG 106.6 75.0 68.1 16.3 11.0 7.5 2018.6667 SEP 111.8 76.1 68.5 15.5 10.9 7.5 2018.7500 OCT 116.5 77.2 68.6 16.1 10.8 7.7 2018.8333 NOV 120.1 78.2 68.8 16.3 10.8 7.7 2018.9167 DEC 123.6 79.5 69.1 16.6 10.9 7.8 2019.0000 JAN 127.8 80.8 69.3 16.7 11.0 7.7 2019.0833 FEB 132.4 82.2 69.6 16.8 11.1 7.7 2019.1667 MAR 137.2 83.7 70.2 17.1 11.1 7.8 2019.2500 APR 143.0 85.5 71.1 17.3 11.1 8.0 2019.3333 MAY 149.1 87.6 71.8 17.3 11.2 8.3 2019.4167 JUN 153.9 89.7 72.5 17.4 11.5 8.6 2019.5000 JUL 157.5 91.8 73.7 17.6 11.7 9.0 2019.5833 AUG 159.6 93.8 74.2 17.5 12.0 8.8 2019.6667 SEP 161.3 95.8 74.5 16.9 12.2 8.7 2019.7500 OCT 163.5 98.2 74.8 16.2 12.4 8.9 2019.8333 NOV 166.6 100.6 75.1 16.0 12.5 9.0 2019.9167 DEC 170.2 102.6 75.3 16.0 12.7 9.0 2020.0000 JAN 173.5 104.9 75.2 16.1 12.9 8.8 2020.0833 FEB 178.1 107.3 75.2 16.7 13.0 8.4 2020.1667 MAR 183.8 109.8 75.3 17.1 13.0 8.2 2020.2500 APR 187.7 112.2 75.7 17.5 13.1 8.2 2020.3333 MAY 189.8 114.8 76.1 18.2 13.2 8.1 2020.4167 JUN 190.7 117.3 76.6 18.5 13.2 7.9 2020.5000 JUL 191.4 119.6 77.5 18.5 13.1 7.8 2020.5833 AUG 194.0 121.7 78.3 18.7 13.1 7.9 2020.6667 SEP 196.9 123.6 78.6 19.0 13.2 8.1 2020.7500 OCT 199.5 125.3 79.6 18.6 13.3 8.6 2020.8333 NOV 203.8 127.2 80.8 17.8 13.3 9.2 2020.9167 DEC 209.3 129.1 82.2 18.1 13.4 9.6 2021.0000 JAN 212.7 131.4 84.1 18.9 13.5 10.1 2021.0833 FEB 214.5 133.8 85.4 19.1 13.6 10.1 2021.1667 MAR 218.5 136.2 86.3 19.5 13.9 10.3 2021.2500 APR 222.8 138.9 88.1 20.5 14.1 10.4 2021.3333 MAY 225.1 141.5 90.0 20.2 14.1 10.6 2021.4167 JUN 226.6 143.9 91.1 20.4 14.1 10.2 2021.5000 JUL 228.5 146.5 93.3 20.7 14.1 10.2 2021.5833 AUG 230.7 149.1 95.7 21.1 14.2 9.9 2021.6667 SEP 233.6 151.4 97.5 21.4 14.2 9.8 2021.7500 OCT 236.4 153.5 98.7 21.4 14.4 10.5 2021.8333 NOV 238.3 155.6 98.8 21.6 14.5 10.9 2021.9167 DEC 238.0 157.6 98.2 21.9 14.7 10.9 2022.0000 JAN 238.0 159.7 97.8 22.4 14.9 11.0 2022.0833 FEB 239.9 161.7 99.1 22.9 15.1 11.2