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% 2005.3333 MAY 94.0 93.9 92.7 15.4 15.1 14.6 2005.4167 JUN 92.6 92.3 90.0 15.5 14.7 13.6 2005.5000 JUL 91.4 91.0 87.5 15.8 14.4 12.7 2005.5833 AUG 90.4 89.8 85.1 16.4 13.9 11.7 2005.6667 SEP 89.4 88.5 83.9 16.8 13.5 10.9 2005.7500 OCT 87.9 87.1 83.2 17.8 13.2 10.2 2005.8333 NOV 86.7 85.9 82.5 18.6 12.9 9.7 2005.9167 DEC 85.9 84.8 81.6 19.0 12.7 9.4 2006.0000 JAN 85.1 83.9 80.4 19.0 12.6 9.2 2006.0833 FEB 84.1 83.0 78.9 18.8 12.6 9.3 2006.1667 MAR 83.1 82.1 77.6 18.8 12.4 9.2 2006.2500 APR 82.2 81.2 76.6 19.1 12.2 9.0 2006.3333 MAY 81.2 80.3 76.3 19.2 12.2 9.0 2006.4167 JUN 80.4 79.2 75.9 19.1 12.1 8.9 2006.5000 JUL 79.2 78.2 75.5 18.8 12.0 8.8 2006.5833 AUG 78.2 77.2 74.5 17.8 11.9 8.9 2006.6667 SEP 77.7 76.4 73.5 16.8 11.8 8.7 2006.7500 OCT 76.9 75.6 72.6 16.5 11.7 8.8 2006.8333 NOV 76.1 74.9 71.8 16.8 11.7 8.8 2006.9167 DEC 75.3 74.4 71.5 17.1 11.7 8.7 2007.0000 JAN 74.6 73.8 70.7 17.4 11.7 8.7 2007.0833 FEB 74.4 73.2 69.9 17.5 11.6 8.6 2007.1667 MAR 74.3 72.8 69.0 17.8 11.6 8.4 2007.2500 APR 74.0 72.5 68.2 18.0 11.5 8.4 2007.3333 MAY 73.5 72.4 67.3 18.2 11.4 8.3 2007.4167 JUN 73.2 72.4 66.6 18.1 11.3 8.1 2007.5000 JUL 73.0 72.5 66.2 17.8 11.2 8.0 2007.5833 AUG 73.3 72.9 66.0 17.4 11.2 7.9 2007.6667 SEP 73.9 73.4 65.6 16.3 11.0 7.8 2007.7500 OCT 74.8 74.0 65.3 15.6 10.9 7.8 2007.8333 NOV 75.9 74.7 65.0 16.2 10.9 7.9 2007.9167 DEC 77.1 75.4 64.6 16.4 10.8 8.0 2008.0000 JAN 78.3 76.3 64.4 16.7 10.9 8.1 2008.0833 FEB 79.8 77.3 64.2 16.8 11.0 7.9 2008.1667 MAR 81.0 78.1 63.6 16.9 11.1 7.8 2008.2500 APR 82.1 79.1 63.4 17.1 11.1 7.8 2008.3333 MAY 85.6 80.5 63.4 17.3 11.1 8.0 2008.4167 JUN 88.3 82.2 63.3 17.3 11.2 8.2 2008.5000 JUL 89.9 84.0 63.5 17.4 11.5 8.5 2008.5833 AUG 91.3 86.1 64.1 17.5 11.7 9.0 2008.6667 SEP 92.4 88.4 64.8 17.4 12.0 8.8 2008.7500 OCT 95.4 90.5 65.5 16.8 12.2 8.7 2008.8333 NOV 97.8 92.9 66.0 16.3 12.4 8.9 2008.9167 DEC 100.6 95.6 67.0 16.3 12.6 9.1 2009.0000 JAN 104.3 98.3 68.3 16.4 12.8 9.1 2009.0833 FEB 108.6 101.2 69.3 16.2 12.9 8.9 2009.1667 MAR 111.6 104.7 71.1 16.2 13.0 8.6 2009.2500 APR 114.6 108.6 73.4 16.0 13.1 8.5 2009.3333 MAY 118.5 112.8 76.6 15.6 13.2 8.5 2009.4167 JUN 123.5 117.1 80.0 15.3 13.3 8.6 2009.5000 JUL 129.3 121.5 83.8 15.0 13.3 8.4 2009.5833 AUG 134.2 125.5 87.7 15.5 13.4 8.6 2009.6667 SEP 138.8 128.2 88.7 16.0 13.5 8.8 2009.7500 OCT 143.4 131.0 89.6 16.5 13.6 8.9 2009.8333 NOV 147.9 133.8 90.6 17.0 13.7 9.1 2009.9167 DEC 152.4 136.4 91.5 17.5 13.8 9.3 2010.0000 JAN 156.7 139.1 92.4 18.0 13.9 9.4 2010.0833 FEB 160.9 141.6 93.3 18.5 14.0 9.6 2010.1667 MAR 165.0 144.1 94.1 18.9 14.1 9.8 2010.2500 APR 168.9 146.4 94.9 19.3 14.2 9.9 2010.3333 MAY 172.5 148.7 95.7 19.7 14.3 10.0 2010.4167 JUN 176.0 150.8 96.4 20.1 14.4 10.2 2010.5000 JUL 179.2 152.7 97.1 20.5 14.5 10.3 2010.5833 AUG 182.1 154.5 97.7 20.8 14.5 10.4 2010.6667 SEP 184.7 156.0 98.2 21.1 14.6 10.5 2010.7500 OCT 187.0 157.4 98.7 21.3 14.6 10.6 2010.8333 NOV 188.9 158.6 99.1 21.5 14.7 10.7 2010.9167 DEC 190.4 159.5 99.4 21.7 14.7 10.7 2011.0000 JAN 191.6 160.2 99.7 21.8 14.7 10.8 2011.0833 FEB 192.3 160.6 99.8 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