TABLE 3 ESTIMATES OF 13-MONTH SMOOTH SOLAR ACTIVITY FOR CYCLE 24 AND 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% 2010.0003 JAN 77.1 76.0 75.0 4.9 4.3 3.7 2010.0837 FEB 79.8 77.3 75.4 5.3 4.0 2.5 2010.1670 MAR 82.6 78.7 75.9 5.6 3.8 1.6 2010.2503 APR 85.7 80.2 75.7 5.6 3.5 0.7 2010.3337 MAY 89.8 81.8 75.9 5.9 3.6 0.2 2010.4170 JUN 94.5 83.6 75.7 6.5 3.8 0.4 2010.5003 JUL 99.8 85.7 74.8 6.8 4.0 0.7 2010.5837 AUG 105.2 88.1 75.0 7.1 4.2 1.1 2010.6670 SEP 109.7 90.5 76.0 7.0 4.0 1.4 2010.7503 OCT 114.1 92.9 77.2 6.6 3.7 1.1 2010.8337 NOV 119.8 95.4 78.5 6.5 3.6 1.4 2010.9170 DEC 126.8 98.1 79.4 6.9 3.8 1.7 2011.0003 JAN 133.2 100.8 79.7 7.1 4.1 1.9 2011.0837 FEB 139.9 103.5 80.2 8.4 4.8 2.6 2011.1670 MAR 147.5 106.2 80.8 9.0 5.5 3.3 2011.2503 APR 155.0 109.1 81.9 9.1 6.0 3.6 2011.3337 MAY 159.5 111.9 83.5 9.5 6.5 3.9 2011.4170 JUN 162.7 114.5 85.4 10.4 7.0 3.8 2011.5003 JUL 166.2 117.0 86.3 11.3 7.3 3.7 2011.5837 AUG 169.0 119.0 86.3 11.3 7.5 3.5 2011.6670 SEP 173.4 121.0 86.3 11.8 7.8 3.5 2011.7503 OCT 179.5 123.4 87.5 12.7 8.4 3.8 2011.8337 NOV 184.3 125.9 88.3 13.8 8.9 4.0 2011.9170 DEC 188.9 128.5 86.7 14.4 9.4 4.2 2012.0003 JAN 193.4 130.7 84.4 14.8 10.0 4.2 2012.0837 FEB 197.3 132.7 83.8 15.6 10.3 4.2 2012.1670 MAR 200.4 134.5 84.5 16.1 10.5 4.4 2012.2503 APR 203.0 136.3 86.8 16.6 10.6 4.6 2012.3337 MAY 205.7 137.9 87.8 17.6 10.7 4.5 2012.4170 JUN 207.7 139.0 87.7 17.9 11.0 4.7 2012.5003 JUL 210.4 140.2 87.3 17.8 11.6 5.8 2012.5837 AUG 213.3 140.9 86.2 18.2 12.4 7.1 2012.6670 SEP 215.8 141.5 86.5 18.3 12.7 8.1 2012.7503 OCT 215.8 142.0 89.4 18.0 12.7 8.5 2012.8337 NOV 215.6 142.5 91.4 18.1 12.8 8.9 2012.9170 DEC 217.0 142.9 93.4 17.8 12.7 8.9 2013.0003 JAN 217.5 142.3 93.8 16.8 12.3 8.4 2013.0837 FEB 215.1 141.1 93.3 15.9 12.1 8.5 2013.1670 MAR 212.1 140.6 93.2 14.7 11.3 7.4 2013.2503 APR 209.1 140.6 93.0 13.7 10.2 6.2 2013.3337 MAY 207.6 140.9 92.2 13.6 9.8 6.2 2013.4170 JUN 207.4 141.4 90.5 14.4 9.6 6.0 2013.5003 JUL 206.8 141.7 88.4 15.3 9.5 5.3 2013.5837 AUG 205.8 141.6 85.7 15.8 9.5 5.1 2013.6670 SEP 204.4 141.2 83.1 16.6 9.6 4.8 2013.7503 OCT 204.2 140.7 80.0 17.0 9.6 4.5 2013.8337 NOV 203.9 140.5 78.3 16.8 10.0 5.2 2013.9170 DEC 203.9 140.4 77.0 16.9 10.2 5.5 2014.0003 JAN 203.0 139.7 75.4 16.3 10.3 5.9 2014.0837 FEB 201.0 138.5 74.4 14.9 10.6 6.6 2014.1670 MAR 198.1 137.0 72.9 16.5 11.1 7.2 2014.2503 APR 195.4 135.3 71.5 17.8 11.7 8.0 2014.3337 MAY 192.6 133.7 69.8 18.3 12.1 7.8 2014.4170 JUN 188.7 132.4 69.0 18.2 12.4 7.8 2014.5003 JUL 185.8 131.2 69.1 17.9 12.5 8.0 2014.5837 AUG 183.3 129.6 70.2 16.9 11.8 7.4 2014.6670 SEP 180.6 128.1 71.9 16.9 11.4 6.8 2014.7503 OCT 178.3 126.9 73.5 17.4 11.5 6.6 2014.8337 NOV 177.9 126.0 75.1 17.0 11.2 6.2 2014.9170 DEC 177.6 125.0 77.3 16.4 10.9 5.7 2015.0003 JAN 175.1 123.6 79.3 16.0 10.8 5.3 2015.0837 FEB 171.6 121.9 80.0 15.7 10.9 5.1 2015.1670 MAR 168.2 120.8 80.6 14.9 11.4 5.6 2015.2503 APR 165.1 120.0 80.9 15.6 11.6 5.9 2015.3337 MAY 163.1 118.9 79.5 16.3 11.8 6.8 2015.4170 JUN 161.2 117.6 78.7 16.8 12.3 7.3 2015.5003 JUL 157.9 116.2 78.9 16.8 12.9 7.8 2015.5837 AUG 152.9 114.7 79.5 16.7 13.2 8.4 2015.6670 SEP 148.0 113.2 79.3 17.8 13.4 8.9 2015.7503 OCT 144.8 111.5 78.6 18.6 13.5 9.5 2015.8337 NOV 142.8 109.6 78.0 18.9 13.7 10.6 2015.9170 DEC 140.9 108.0 78.0 18.7 13.9 10.2 2016.0003 JAN 138.1 106.5 77.9 18.3 14.0 9.9 2016.0837 FEB 134.7 105.0 77.5 18.1 13.8 9.4 2016.1670 MAR 131.2 103.5 78.0 18.2 13.6 9.1 2016.2503 APR 128.4 102.3 78.1 18.4 13.2 8.8 2016.3337 MAY 125.4 101.0 77.1 18.3 12.6 8.1 2016.4170 JUN 120.6 99.6 76.0 18.1 11.8 6.6 2016.5003 JUL 120.1 98.3 75.2 17.7 10.8 4.9 2016.5837 AUG 119.5 97.1 74.0 17.3 10.0 4.2 2016.6670 SEP 119.3 96.0 73.1 17.3 9.6 3.8 2016.7503 OCT 118.3 95.0 72.6 17.2 9.4 3.4 2016.8337 NOV 116.9 94.0 72.3 16.7 9.0 3.2 2016.9170 DEC 116.7 93.1 72.1 16.1 8.9 3.4 2017.0003 JAN 115.7 92.0 71.7 15.6 9.0 3.8 2017.0837 FEB 114.6 91.0 71.5 15.1 9.2 4.3 2017.1670 MAR 113.2 90.2 71.5 15.1 9.7 4.7 2017.2503 APR 109.9 89.4 71.6 15.2 10.2 5.1 2017.3337 MAY 105.9 88.3 71.1 15.7 10.9 5.9 2017.4170 JUN 103.1 87.3 70.7 16.3 11.7 7.0 2017.5003 JUL 101.6 86.5 70.4 17.1 12.3 8.0 2017.5837 AUG 100.1 85.7 70.3 17.9 12.6 8.6 2017.6670 SEP 97.9 84.8 70.0 18.5 12.9 9.0 2017.7503 OCT 96.4 83.7 69.6 19.0 13.2 9.2 2017.8337 NOV 94.4 82.6 69.5 19.3 13.6 9.3 2017.9170 DEC 93.4 81.8 69.4 19.5 14.2 9.7 2018.0003 JAN 93.2 81.0 69.4 19.8 15.2 10.3 2018.0837 FEB 92.3 80.3 69.3 20.0 16.1 10.9 2018.1670 MAR 91.0 79.6 69.1 21.1 16.8 11.1 2018.2503 APR 89.7 78.9 69.0 21.5 17.1 11.1 2018.3337 MAY 88.5 78.2 68.8 21.3 16.9 11.2 2018.4170 JUN 87.2 77.5 68.7 20.7 16.7 11.2 2018.5003 JUL 85.9 76.8 68.5 20.5 16.8 11.8 2018.5837 AUG 84.7 76.1 68.4 20.9 17.3 12.7 2018.6670 SEP 83.5 75.5 68.2 21.1 17.4 13.0 2018.7503 OCT 82.4 74.8 68.1 20.9 17.3 13.1 2018.8337 NOV 81.3 74.2 68.0 20.4 16.8 12.8 2018.9170 DEC 80.2 73.7 67.8 19.3 15.9 12.2 2019.0003 JAN 79.2 73.1 67.7 18.2 15.0 11.5 2019.0837 FEB 78.2 72.6 67.6 17.2 14.2 10.8 2019.1670 MAR 77.4 72.1 67.5 16.2 13.3 10.2 2019.2503 APR 76.6 71.7 67.4 15.3 12.5 9.6 2019.3337 MAY 75.8 71.3 67.3 14.4 11.8 9.1 2019.4170 JUN 75.2 70.9 67.2 13.6 11.1 8.5 2019.5003 JUL 74.6 70.6 67.2 12.9 10.5 8.1 2019.5837 AUG 74.1 70.3 67.1 12.2 10.0 7.7 2019.6670 SEP 73.7 70.1 67.1 11.7 9.5 7.4 2019.7503 OCT 73.4 70.0 67.0 11.4 9.2 7.1 2019.8337 NOV 73.3 69.9 67.0 11.1 9.0 7.0 2019.9170 DEC 73.2 69.9 67.0 11.1 9.0 6.9 2020.0003 JAN 73.3 70.0 67.0 11.3 9.0 6.9 2020.0837 FEB 74.0 70.3 67.1 11.6 9.2 7.1 2020.1670 MAR 74.8 70.7 67.2 11.7 9.3 7.4 2020.2503 APR 75.6 71.0 67.2 11.9 9.4 7.5 2020.3337 MAY 76.7 71.5 67.4 12.0 9.5 7.5 2020.4170 JUN 78.2 72.0 67.5 12.1 9.6 7.3 2020.5003 JUL 79.6 72.6 67.6 12.2 9.7 7.2 2020.5837 AUG 81.0 73.3 67.8 12.5 9.9 7.1 2020.6670 SEP 83.3 74.1 67.9 12.8 10.1 7.0 2020.7503 OCT 86.3 75.1 68.0 13.2 10.5 7.2 2020.8337 NOV 91.0 76.3 68.3 13.7 10.8 7.6 2020.9170 DEC 95.4 77.7 68.4 14.5 11.1 7.9 2021.0003 JAN 98.8 79.2 68.4 15.7 11.4 7.7 2021.0837 FEB 103.9 80.9 68.4 16.1 11.6 7.7 2021.1670 MAR 109.8 82.9 68.4 16.3 11.8 7.6 2021.2503 APR 115.6 85.1 68.3 16.8 12.0 7.6 2021.3337 MAY 122.9 87.3 68.6 18.0 12.3 7.6 2021.4170 JUN 131.3 89.9 68.7 18.9 12.6 7.7 2021.5003 JUL 137.8 92.6 68.9 19.1 12.7 7.7 2021.5837 AUG 142.5 95.4 69.2 19.2 12.9 7.8 2021.6670 SEP 146.9 98.2 69.2 19.0 13.1 7.7 2021.7503 OCT 151.3 101.0 69.5 18.6 13.1 7.7 2021.8337 NOV 156.2 103.9 69.9 18.5 13.2 7.8 2021.9170 DEC 161.5 107.0 70.6 18.9 13.4 8.0 2022.0003 JAN 166.8 110.1 70.9 18.8 13.5 8.2 2022.0837 FEB 171.3 113.2 71.3 17.8 13.5 8.6 2022.1670 MAR 177.2 116.5 71.5 17.9 13.7 8.7 2022.2503 APR 184.7 119.7 72.1 18.5 13.9 8.7 2022.3337 MAY 189.7 122.9 72.9 19.1 14.2 9.0 2022.4170 JUN 192.2 125.7 73.3 19.6 14.6 9.4 2022.5003 JUL 194.8 128.2 74.1 20.3 14.9 9.6 2022.5837 AUG 197.9 130.5 74.7 20.3 15.1 9.6 2022.6670 SEP 202.4 132.6 75.1 20.3 15.1 9.8 2022.7503 OCT 208.5 135.1 75.6 20.5 15.2 10.0 2022.8337 NOV 212.6 137.7 75.9 20.8 15.4 10.5 2022.9170 DEC 215.4 140.3 76.1 21.2 15.4 11.1 2023.0003 JAN 219.9 142.4 76.1 21.3 15.3 11.6 2023.0837 FEB 224.3 144.3 76.0 21.4 15.1 11.3 2023.1670 MAR 226.4 146.0 76.1 21.6 15.0 11.2 2023.2503 APR 227.3 147.7 76.6 22.0 15.0 10.7 2023.3337 MAY 229.2 149.0 76.9 22.8 14.9 10.2 2023.4170 JUN 231.4 149.9 77.6 22.5 14.7 9.9 2023.5003 JUL 234.2 150.8 78.9 21.3 14.5 10.1 2023.5837 AUG 237.3 151.2 79.7 20.6 14.3 10.1 2023.6670 SEP 238.6 151.4 80.6 20.1 14.2 10.3 2023.7503 OCT 236.8 151.7 82.2 19.6 14.1 10.6 2023.8337 NOV 234.8 151.9 83.8 19.5 14.0 10.6 2023.9170 DEC 235.8 152.0 85.6 19.3 14.0 10.5 2024.0003 JAN 236.3 151.2 86.4 19.1 14.2 10.5 2024.0837 FEB 234.1 149.7 87.8 18.9 14.6 10.5 2024.1670 MAR 230.9 148.7 89.5 18.9 14.7 10.3 2024.2503 APR 227.3 148.4 90.7 19.5 14.6 9.8 2024.3337 MAY 225.6 148.5 93.0 20.4 14.7 10.2 2024.4170 JUN 226.0 148.9 94.2 22.0 15.0 10.7 2024.5003 JUL 226.2 149.0 95.5 23.4 15.3 10.7 2024.5837 AUG 225.0 148.7 95.8 24.0 15.4 10.9 2024.6670 SEP 223.5 148.1 95.4 25.1 15.7 11.1 2024.7503 OCT 223.0 147.5 95.4 25.6 15.9 11.3 2024.8337 NOV 223.0 147.3 96.9 24.9 15.9 11.5 2024.9170 DEC 222.6 147.2 97.7 24.8 15.9 11.7 2025.0003 JAN 221.7 146.4 97.2 23.9 15.8 11.9 2025.0837 FEB 219.4 145.1 96.4 22.1 15.8 11.8 2025.1670 MAR 216.2 143.5 96.3 22.4 15.9 12.0 2025.2503 APR 213.5 141.8 96.8 23.1 16.0 11.8 2025.3337 MAY 210.9 140.1 96.3 23.1 16.0 11.1 2025.4170 JUN 207.5 138.8 95.5 22.6 16.0 10.8 2025.5003 JUL 206.4 137.4 96.1 22.0 15.8 10.8 2025.5837 AUG 204.4 135.6 97.1 21.9 15.8 10.8 2025.6670 SEP 201.0 133.7 96.2 22.7 16.1 10.8 2025.7503 OCT 197.5 132.2 94.5 23.7 16.5 10.8 2025.8337 NOV 195.1 130.9 93.8 23.9 16.7 10.8 2025.9170 DEC 193.0 129.5 93.6 23.9 17.0 10.7 2026.0003 JAN 189.1 127.8 91.7 23.9 17.1 10.6 2026.0837 FEB 184.5 125.9 88.3 23.5 17.2 10.3 2026.1670 MAR 180.1 124.6 87.9 22.5 17.2 10.5 2026.2503 APR 176.3 123.5 88.7 22.7 17.2 10.7 2026.3337 MAY 174.0 122.3 87.3 23.0 17.4 11.4 2026.4170 JUN 172.1 121.0 86.3 23.1 17.6 11.9 2026.5003 JUL 167.8 119.3 85.7 22.5 17.8 12.0 2026.5837 AUG 161.4 117.4 84.8 21.7 17.6 12.1 2026.6670 SEP 155.5 115.6 83.6 21.2 17.4 12.3 2026.7503 OCT 151.9 113.7 82.5 21.7 17.0 12.5 2026.8337 NOV 149.6 111.7 82.1 21.7 16.9 13.3 2026.9170 DEC 147.1 110.0 82.1 22.1 16.9 13.1 2027.0003 JAN 144.1 108.6 82.0 22.6 17.0 12.8 2027.0837 FEB 141.1 107.0 80.9 22.3 16.8 13.1 2027.1670 MAR 137.5 105.5 80.5 22.4 16.5 12.7 2027.2503 APR 133.8 104.0 80.6 22.7 16.2 12.5 2027.3337 MAY 129.6 102.5 80.0 22.9 15.8 12.1 2027.4170 JUN 123.6 100.9 79.1 23.5 15.6 11.2 2027.5003 JUL 119.4 99.4 77.7 24.1 15.4 10.5 2027.5837 AUG 118.6 98.2 75.6 24.8 15.3 10.7 2027.6670 SEP 118.7 97.1 74.5 25.3 15.3 10.8 2027.7503 OCT 119.2 96.1 74.0 25.6 15.3 10.6 2027.8337 NOV 119.6 95.2 73.6 25.4 15.3 10.8 2027.9170 DEC 118.8 94.2 73.4 24.9 15.2 11.0 2028.0003 JAN 117.4 92.9 73.0 24.0 15.0 11.1 2028.0837 FEB 115.8 91.7 72.7 23.0 14.9 11.3 2028.1670 MAR 113.7 90.7 71.9 22.5 15.0 11.2 2028.2503 APR 110.2 89.6 71.4 22.1 15.1 11.1 2028.3337 MAY 105.8 88.4 71.0 21.8 15.2 11.2 2028.4170 JUN 103.2 87.3 70.7 21.4 15.3 11.4 2028.5003 JUL 101.6 86.5 70.4 20.7 15.2 11.5 2028.5837 AUG 100.2 85.6 70.5 19.9 14.9 11.3 2028.6670 SEP 98.1 84.7 70.3 20.0 14.7 11.1 2028.7503 OCT 96.6 83.5 69.8 20.1 14.6 10.8 2028.8337 NOV 94.6 82.4 69.6 19.9 14.3 10.1 2028.9170 DEC 93.5 81.7 69.5 19.5 14.2 9.6 2029.0003 JAN 93.2 81.0 69.4 19.0 14.1 9.1 2029.0837 FEB 92.3 80.3 69.3 18.3 14.1 8.6 2029.1670 MAR 91.3 79.6 69.1 17.3 14.0 8.0 2029.2503 APR 90.5 78.9 68.8 17.4 13.8 7.5 2029.3337 MAY 89.7 78.2 68.5 17.5 13.7 7.6 2029.4170 JUN 88.7 77.5 68.3 17.6 13.7 7.8 2029.5003 JUL 87.7 77.0 68.4 17.5 13.6 8.3 2029.5837 AUG 86.9 76.5 68.4 17.7 13.5 8.6 2029.6670 SEP 85.5 75.9 68.5 18.1 13.4 8.5 2029.7503 OCT 84.1 75.4 68.4 17.9 13.2 8.6 2029.8337 NOV 82.2 74.9 68.4 17.6 12.9 8.5 2029.9170 DEC 79.9 74.2 68.3 17.3 12.6 8.5 2030.0003 JAN 78.4 73.5 68.0 16.3 12.2 8.4 2030.0837 FEB 77.5 72.8 67.8 14.8 11.8 8.4 2030.1670 MAR 77.0 72.3 67.6 13.8 11.4 8.3 2030.2503 APR 76.9 72.0 67.6 13.9 11.0 8.2 2030.3337 MAY 76.6 71.6 67.5 13.6 10.6 8.2 2030.4170 JUN 76.5 71.2 67.2 13.2 10.3 7.9 2030.5003 JUL 76.1 70.9 67.1 12.9 9.9 7.4 2030.5837 AUG 75.1 70.6 67.1 12.6 9.7 7.1 2030.6670 SEP 74.2 70.3 67.0 11.9 9.5 7.3 2030.7503 OCT 74.0 70.1 67.0 11.4 9.4 7.1