TABLE 4 ESTIMATES OF 13-MONTH SMOOTH SOLAR ACTIVITY FOR BALANCE OF CYCLE 24 CYCLE 25 AND BEGINNING OF CYCLE 26 TIME SUNSPOT NUMBERS GEOMAGNETIC INDEX (Ap) PERCENTILE PERCENTILE 95.0% 50% 5.0% 95.0% 50% 5.0% 2009.5003 JUL 4.1 3.1 1.4 4.1 3.9 3.6 2009.5837 AUG 6.7 3.7 0.6 4.3 3.6 3.2 2009.6670 SEP 9.8 4.2 0.1 4.4 3.4 2.9 2009.7503 OCT 11.9 4.7 0.1 4.3 3.3 2.6 2009.8337 NOV 13.7 5.1 0.0 4.6 3.3 2.4 2009.9170 DEC 15.8 5.7 0.0 4.5 2.9 1.8 2010.0003 JAN 17.8 6.6 0.0 3.8 2.1 0.8 2010.0837 FEB 20.3 7.3 0.0 4.0 1.8 0.2 2010.1670 MAR 24.4 8.4 0.0 4.3 1.5 -0.6 2010.2503 APR 28.9 9.9 0.0 4.5 1.1 -1.6 2010.3337 MAY 34.7 11.2 0.0 5.6 1.4 -1.8 2010.4170 JUN 41.3 12.4 0.0 6.7 1.8 -1.3 2010.5003 JUL 48.1 14.5 0.0 6.9 2.0 -1.3 2010.5837 AUG 54.5 17.0 0.0 6.6 1.9 -1.5 2010.6670 SEP 60.4 19.5 0.0 5.5 1.2 -2.1 2010.7503 OCT 66.5 22.1 0.0 4.4 0.7 -2.3 2010.8337 NOV 73.7 24.3 0.0 3.5 0.4 -2.3 2010.9170 DEC 81.6 26.4 0.0 3.0 0.4 -2.3 2011.0003 JAN 88.6 28.7 0.0 3.0 0.6 -1.9 2011.0837 FEB 94.8 30.8 0.0 4.3 1.5 -1.0 2011.1670 MAR 101.8 32.8 0.0 5.3 2.5 -0.3 2011.2503 APR 109.3 35.3 0.0 5.2 2.9 -0.1 2011.3337 MAY 113.5 37.3 0.0 5.6 3.3 0.0 2011.4170 JUN 115.4 39.3 0.6 6.4 3.7 -0.2 2011.5003 JUL 118.3 41.3 0.9 7.1 3.9 -0.5 2011.5837 AUG 121.0 42.8 0.0 7.5 4.4 -0.3 2011.6670 SEP 124.9 44.4 0.2 8.4 5.1 0.2 2011.7503 OCT 130.5 46.4 2.0 9.6 5.9 0.9 2011.8337 NOV 134.9 48.6 3.4 10.8 6.6 1.2 2011.9170 DEC 137.7 51.2 4.3 11.5 7.1 1.4 2012.0003 JAN 142.5 54.1 6.9 12.0 7.9 1.6 2012.0837 FEB 148.1 56.6 10.5 13.2 8.5 2.0 2012.1670 MAR 151.5 58.7 14.2 14.0 8.9 2.5 2012.2503 APR 154.4 60.8 15.8 14.6 9.1 2.8 2012.3337 MAY 157.6 62.6 16.3 15.4 9.0 2.5 2012.4170 JUN 160.4 64.4 15.9 16.0 9.5 3.0 2012.5003 JUL 162.8 66.3 16.0 16.3 10.5 4.4 2012.5837 AUG 165.2 68.5 18.0 16.9 11.4 5.9 2012.6670 SEP 167.5 70.5 19.8 16.8 11.6 6.6 2012.7503 OCT 167.0 71.2 20.9 16.4 11.5 6.8 2012.8337 NOV 166.4 72.0 22.5 16.6 11.6 7.3 2012.9170 DEC 167.9 73.1 24.1 16.2 11.5 7.2 2013.0003 JAN 168.5 73.3 24.7 14.7 10.7 6.2 2013.0837 FEB 166.7 73.5 25.1 13.4 10.2 5.9 2013.1670 MAR 164.1 74.8 26.4 11.4 8.8 4.8 2013.2503 APR 161.5 76.4 28.9 10.3 7.3 3.4 2013.3337 MAY 160.0 77.0 30.8 10.3 6.9 2.7 2013.4170 JUN 159.5 77.0 31.2 11.0 6.4 1.9 2013.5003 JUL 158.9 77.2 31.6 11.4 5.9 1.3 2013.5837 AUG 158.6 77.8 32.4 11.6 5.8 1.3 2013.6670 SEP 158.1 78.0 33.7 12.1 5.5 1.1 2013.7503 OCT 157.5 77.7 32.6 12.2 5.4 1.0 2013.8337 NOV 157.7 76.9 30.5 12.3 6.1 1.8 2013.9170 DEC 157.4 76.7 29.7 12.7 6.4 2.3 2014.0003 JAN 156.4 76.5 30.2 12.0 6.5 3.1 2014.0837 FEB 153.3 75.5 29.5 11.2 6.8 3.6 2014.1670 MAR 148.5 73.1 27.1 11.4 7.2 4.1 2014.2503 APR 144.8 71.1 24.7 12.8 7.9 4.9 2014.3337 MAY 141.2 69.6 22.6 13.3 8.3 5.2 2014.4170 JUN 136.4 67.9 20.6 13.7 8.9 5.5 2014.5003 JUL 132.8 66.1 19.5 14.2 9.3 5.9 2014.5837 AUG 129.4 64.4 19.0 12.9 8.4 5.2 2014.6670 SEP 126.3 63.8 19.7 12.1 7.8 4.5 2014.7503 OCT 124.0 63.9 21.4 12.7 7.8 4.3 2014.8337 NOV 120.7 63.6 22.9 12.0 7.4 3.8 2014.9170 DEC 118.1 62.4 23.8 11.1 6.9 3.2 2015.0003 JAN 115.9 61.6 23.9 10.5 6.6 2.7 2015.0837 FEB 113.5 61.2 24.4 10.6 7.0 2.6 2015.1670 MAR 111.5 60.3 23.1 12.4 8.0 3.5 2015.2503 APR 108.9 59.2 21.5 13.6 8.7 4.2 2015.3337 MAY 106.0 58.1 20.7 14.6 9.3 4.7 2015.4170 JUN 102.2 56.8 19.8 15.3 10.0 4.8 2015.5003 JUL 98.0 55.8 19.0 15.4 10.7 5.5 2015.5837 AUG 95.6 54.9 18.6 15.6 11.4 6.7 2015.6670 SEP 90.5 53.6 18.2 16.0 12.0 7.8 2015.7503 OCT 85.1 51.7 17.9 17.3 12.5 9.0 2015.8337 NOV 80.4 49.6 17.6 18.2 13.2 10.0 2015.9170 DEC 78.2 47.2 16.3 19.0 14.2 10.2 2016.0003 JAN 76.3 45.1 15.2 20.0 14.8 10.5 2016.0837 FEB 73.8 43.6 14.8 20.0 14.7 10.4 2016.1670 MAR 71.1 42.2 13.0 20.2 14.6 10.3 2016.2503 APR 69.1 41.3 10.6 20.5 14.3 10.1 2016.3337 MAY 67.1 40.6 9.1 20.6 13.8 9.5 2016.4170 JUN 66.8 40.0 8.6 20.8 13.2 8.3 2016.5003 JUL 65.4 38.7 7.8 20.8 12.4 6.8 2016.5837 AUG 65.4 37.6 7.2 20.6 11.5 6.0 2016.6670 SEP 64.5 36.5 6.3 20.7 11.2 5.5 2016.7503 OCT 62.2 35.0 5.2 20.6 11.0 5.1 2016.8337 NOV 61.6 34.0 4.8 20.0 10.4 4.7 2016.9170 DEC 61.4 33.3 4.5 19.0 9.9 4.4 2017.0003 JAN 60.7 32.8 4.5 18.0 9.7 4.5 2017.0837 FEB 59.6 32.4 4.9 17.4 9.9 5.0 2017.1670 MAR 57.5 31.9 5.0 17.7 10.7 5.7 2017.2503 APR 54.2 31.2 5.5 17.6 11.1 6.1 2017.3337 MAY 50.5 30.0 5.8 18.1 11.9 7.0 2017.4170 JUN 47.5 28.8 5.5 18.5 12.8 8.2 2017.5003 JUL 48.5 28.3 5.7 18.8 13.4 9.3 2017.5837 AUG 47.9 27.7 6.1 18.9 13.7 9.9 2017.6670 SEP 44.9 26.1 5.9 19.4 13.9 10.2 2017.7503 OCT 42.1 24.4 5.4 19.8 14.1 10.3 2017.8337 NOV 40.4 23.3 5.1 20.0 14.5 10.3 2017.9170 DEC 39.5 22.1 4.8 20.3 15.3 10.7 2018.0003 JAN 37.2 20.6 4.2 20.8 16.5 11.5 2018.0837 FEB 34.4 19.1 3.5 21.1 17.7 12.2 2018.1670 MAR 31.7 17.9 2.6 22.1 18.4 12.2 2018.2503 APR 30.3 17.0 2.4 22.2 18.5 12.1 2018.3337 MAY 28.9 16.2 2.2 21.8 18.2 11.9 2018.4170 JUN 27.5 15.4 2.0 21.0 17.7 11.8 2018.5003 JUL 26.2 14.6 1.9 20.9 17.9 12.5 2018.5837 AUG 24.9 13.7 1.7 21.4 18.6 13.5 2018.6670 SEP 23.6 13.0 1.5 21.9 18.9 13.9 2018.7503 OCT 22.3 12.2 1.4 22.0 18.9 14.1 2018.8337 NOV 21.1 11.5 1.2 21.6 18.5 13.9 2018.9170 DEC 20.0 10.8 1.0 20.4 17.4 13.1 2019.0003 JAN 18.9 10.1 0.9 19.2 16.3 12.3 2019.0837 FEB 17.8 9.4 0.8 18.0 15.2 11.5 2019.1670 MAR 16.9 8.9 0.6 16.9 14.2 10.8 2019.2503 APR 16.0 8.3 0.5 15.8 13.3 10.1 2019.3337 MAY 15.2 7.8 0.4 14.8 12.4 9.4 2019.4170 JUN 14.4 7.4 0.3 13.9 11.5 8.8 2019.5003 JUL 13.8 7.0 0.2 13.1 10.8 8.3 2019.5837 AUG 13.3 6.7 0.2 12.4 10.2 7.8 2019.6670 SEP 12.8 6.4 0.1 11.8 9.7 7.5 2019.7503 OCT 12.5 6.2 0.1 11.4 9.3 7.2 2019.8337 NOV 12.3 6.1 0.0 11.1 9.0 7.0 2019.9170 DEC 12.3 6.1 0.0 11.1 9.0 6.9 2020.0003 JAN 12.9 6.5 0.4 11.3 9.0 6.9 2020.0837 FEB 14.2 7.2 0.9 11.6 9.2 7.1 2020.1670 MAR 15.4 7.8 1.2 11.7 9.3 7.4 2020.2503 APR 16.6 8.5 1.7 11.9 9.4 7.5 2020.3337 MAY 18.1 9.3 1.8 12.0 9.5 7.5 2020.4170 JUN 20.6 10.2 2.3 12.1 9.6 7.3 2020.5003 JUL 23.0 11.2 2.9 12.2 9.7 7.2 2020.5837 AUG 25.1 12.3 3.1 12.5 9.9 7.1 2020.6670 SEP 28.3 13.6 3.2 12.8 10.1 7.0 2020.7503 OCT 32.2 15.1 3.5 13.2 10.5 7.2 2020.8337 NOV 38.2 16.9 3.5 13.7 10.8 7.6 2020.9170 DEC 43.7 19.0 3.5 14.5 11.1 7.9 2021.0003 JAN 47.9 21.0 4.2 15.7 11.4 7.7 2021.0837 FEB 54.1 23.4 4.3 16.1 11.6 7.7 2021.1670 MAR 60.7 25.9 4.3 16.3 11.8 7.6 2021.2503 APR 66.8 28.4 4.8 16.8 12.0 7.6 2021.3337 MAY 74.4 31.2 4.8 18.0 12.3 7.6 2021.4170 JUN 83.1 34.5 5.2 18.9 12.6 7.7 2021.5003 JUL 89.9 37.8 5.8 19.1 12.7 7.7 2021.5837 AUG 95.1 41.3 6.8 19.2 12.9 7.8 2021.6670 SEP 100.0 44.8 7.7 19.0 13.1 7.7 2021.7503 OCT 105.0 48.2 9.1 18.6 13.1 7.7 2021.8337 NOV 110.5 51.5 9.8 18.5 13.2 7.8 2021.9170 DEC 116.5 54.9 9.9 18.9 13.4 8.0 2022.0003 JAN 122.0 58.5 11.2 18.8 13.5 8.2 2022.0837 FEB 126.8 62.1 12.4 17.8 13.5 8.6 2022.1670 MAR 134.1 65.8 13.4 17.9 13.7 8.7 2022.2503 APR 141.4 69.4 14.6 18.5 13.9 8.7 2022.3337 MAY 146.1 72.7 15.1 19.1 14.2 9.0 2022.4170 JUN 147.9 75.6 15.6 19.6 14.6 9.4 2022.5003 JUL 151.0 78.5 16.2 20.3 14.9 9.6 2022.5837 AUG 154.7 80.9 16.7 20.3 15.1 9.6 2022.6670 SEP 158.4 83.0 17.1 20.3 15.1 9.8 2022.7503 OCT 163.8 85.3 17.1 20.5 15.2 10.0 2022.8337 NOV 167.3 87.7 16.7 20.8 15.4 10.5 2022.9170 DEC 169.1 90.1 16.4 21.2 15.4 11.1 2023.0003 JAN 172.9 92.3 16.8 21.3 15.3 11.6 2023.0837 FEB 177.6 94.2 17.5 21.4 15.1 11.3 2023.1670 MAR 180.4 96.2 18.7 21.6 15.0 11.2 2023.2503 APR 182.4 98.4 20.6 22.0 15.0 10.7 2023.3337 MAY 185.0 100.2 21.8 22.8 14.9 10.2 2023.4170 JUN 187.4 101.3 23.1 22.5 14.7 9.9 2023.5003 JUL 189.5 102.2 25.4 21.3 14.5 10.1 2023.5837 AUG 190.7 102.4 28.1 20.6 14.3 10.1 2023.6670 SEP 192.2 102.8 30.7 20.1 14.2 10.3 2023.7503 OCT 192.5 103.6 32.1 19.6 14.1 10.6 2023.8337 NOV 192.1 104.1 33.4 19.5 14.0 10.6 2023.9170 DEC 193.4 104.4 35.7 19.3 14.0 10.5 2024.0003 JAN 193.9 103.6 37.4 19.1 14.2 10.5 2024.0837 FEB 190.8 102.1 39.6 18.9 14.6 10.5 2024.1670 MAR 186.3 101.2 41.2 18.9 14.7 10.3 2024.2503 APR 181.9 100.7 42.7 19.5 14.6 9.8 2024.3337 MAY 179.6 100.4 43.9 20.4 14.7 10.2 2024.4170 JUN 178.9 100.1 43.8 22.0 15.0 10.7 2024.5003 JUL 177.8 99.7 43.3 23.4 15.3 10.7 2024.5837 AUG 176.5 99.1 44.0 24.0 15.4 10.9 2024.6670 SEP 175.3 98.5 45.9 25.1 15.7 11.1 2024.7503 OCT 174.5 98.0 46.0 25.6 15.9 11.3 2024.8337 NOV 173.4 97.4 45.1 24.9 15.9 11.5 2024.9170 DEC 172.3 96.6 44.4 24.8 15.9 11.7 2025.0003 JAN 170.7 95.7 44.9 23.9 15.8 11.9 2025.0837 FEB 168.1 94.1 45.4 22.1 15.8 11.8 2025.1670 MAR 164.2 92.1 44.3 22.4 15.9 12.0 2025.2503 APR 161.0 90.3 43.7 23.1 16.0 11.8 2025.3337 MAY 157.9 89.1 44.7 23.1 16.0 11.1 2025.4170 JUN 153.9 87.8 45.7 22.6 16.0 10.8 2025.5003 JUL 150.5 86.2 44.6 22.0 15.8 10.8 2025.5837 AUG 146.4 84.3 42.6 21.9 15.8 10.8 2025.6670 SEP 142.9 82.9 41.6 22.7 16.1 10.8 2025.7503 OCT 142.0 81.8 41.3 23.7 16.5 10.8 2025.8337 NOV 138.7 80.3 39.3 23.9 16.7 10.8 2025.9170 DEC 136.4 78.4 35.0 23.9 17.0 10.7 2026.0003 JAN 135.3 76.6 34.1 23.9 17.1 10.6 2026.0837 FEB 132.3 74.9 35.4 23.5 17.2 10.3 2026.1670 MAR 128.8 73.5 34.6 22.5 17.2 10.5 2026.2503 APR 124.8 72.3 32.7 22.7 17.2 10.7 2026.3337 MAY 120.7 71.1 31.7 23.0 17.4 11.4 2026.4170 JUN 117.2 69.7 30.9 23.1 17.6 11.9 2026.5003 JUL 114.8 68.0 29.4 22.5 17.8 12.0 2026.5837 AUG 110.8 66.0 27.7 21.7 17.6 12.1 2026.6670 SEP 104.4 63.7 26.7 21.2 17.4 12.3 2026.7503 OCT 97.6 61.3 26.3 21.7 17.0 12.5 2026.8337 NOV 93.7 59.4 26.6 21.7 16.9 13.3 2026.9170 DEC 92.5 57.7 25.8 22.1 16.9 13.1 2027.0003 JAN 91.4 56.1 24.3 22.6 17.0 12.8 2027.0837 FEB 88.9 54.7 24.4 22.3 16.8 13.1 2027.1670 MAR 86.8 53.1 23.8 22.4 16.5 12.7 2027.2503 APR 83.1 51.4 22.7 22.7 16.2 12.5 2027.3337 MAY 79.8 49.8 21.9 22.9 15.8 12.1 2027.4170 JUN 76.3 48.2 20.4 23.5 15.6 11.2 2027.5003 JUL 71.0 46.4 18.9 24.1 15.4 10.5 2027.5837 AUG 69.8 44.7 16.7 24.8 15.3 10.7 2027.6670 SEP 70.1 43.5 14.9 25.3 15.3 10.8 2027.7503 OCT 69.7 42.3 13.7 25.6 15.3 10.6 2027.8337 NOV 69.6 41.1 11.9 25.4 15.3 10.8 2027.9170 DEC 68.8 39.7 10.4 24.9 15.2 11.0 2028.0003 JAN 66.8 38.2 9.5 24.0 15.0 11.1 2028.0837 FEB 64.1 36.8 8.7 23.0 14.9 11.3 2028.1670 MAR 60.9 35.5 7.9 22.5 15.0 11.2 2028.2503 APR 56.4 34.1 7.8 22.1 15.1 11.1 2028.3337 MAY 52.1 32.5 7.9 21.8 15.2 11.2 2028.4170 JUN 49.0 31.3 7.6 21.4 15.3 11.4 2028.5003 JUL 49.8 30.5 7.5 20.7 15.2 11.5 2028.5837 AUG 49.0 29.5 7.4 19.9 14.9 11.3 2028.6670 SEP 46.4 28.2 7.1 20.0 14.7 11.1 2028.7503 OCT 44.0 26.8 6.5 20.1 14.6 10.8 2028.8337 NOV 42.0 25.7 6.5 19.9 14.3 10.1 2028.9170 DEC 40.9 24.9 6.1 19.5 14.2 9.6 2029.0003 JAN 39.5 23.8 5.5 19.0 14.1 9.1 2029.0837 FEB 38.8 22.8 5.2 18.3 14.1 8.6 2029.1670 MAR 38.1 21.9 4.6 17.3 14.0 8.0 2029.2503 APR 37.7 21.0 3.8 17.4 13.8 7.5 2029.3337 MAY 36.9 20.0 3.6 17.5 13.7 7.6 2029.4170 JUN 35.9 19.2 3.5 17.6 13.7 7.8 2029.5003 JUL 34.7 18.3 3.3 17.5 13.6 8.3 2029.5837 AUG 33.3 17.4 3.2 17.7 13.5 8.6 2029.6670 SEP 31.6 16.5 2.6 18.1 13.4 8.5 2029.7503 OCT 29.7 15.5 2.0 17.9 13.2 8.6 2029.8337 NOV 27.1 14.8 1.6 17.6 12.9 8.5 2029.9170 DEC 24.5 13.8 1.6 17.3 12.6 8.5 2030.0003 JAN 22.1 12.6 1.3 16.3 12.2 8.4 2030.0837 FEB 20.3 11.5 0.9 14.8 11.8 8.4 2030.1670 MAR 19.2 10.5 0.6 13.8 11.4 8.3 2030.2503 APR 18.9 9.7 0.6 13.9 11.0 8.2 2030.3337 MAY 18.5 9.1 0.5 13.6 10.6 8.2 2030.4170 JUN 18.2 8.5 0.4 13.2 10.3 7.9 2030.5003 JUL 16.8 8.0 0.3 12.9 9.9 7.4 2030.5837 AUG 15.9 7.5 0.2 12.6 9.7 7.1 2030.6670 SEP 15.8 7.0 0.1 11.9 9.5 7.3 2030.7503 OCT 15.0 6.5 0.0 11.4 9.4 7.1