TABLE 3 ESTIMATES OF 13-MONTH SMOOTH SOLAR ACTIVITY FOR BALANCE OF CYCLE 25 WITH A MEAN CYCLE GIVEN FOR CYCLE 26 TIME 10.7 CM SOLAR FLUX (F10.7) GEOMAGNETIC INDEX (Ap) PERCENTILE PERCENTILE 95.0% 50% 5.0% 95.0% 50% 5.0% 2020.3337 MAY 71.4 70.9 70.3 5.7 5.2 4.9 2020.4170 JUN 72.8 71.4 70.6 6.2 5.3 4.5 2020.5003 JUL 74.0 72.0 70.4 6.6 5.2 4.2 2020.5837 AUG 75.1 72.7 70.3 7.2 5.2 4.1 2020.6670 SEP 76.9 73.5 70.3 7.3 5.2 4.0 2020.7503 OCT 79.2 74.3 70.3 7.5 5.4 4.0 2020.8337 NOV 83.0 75.4 70.6 7.7 5.7 4.1 2020.9170 DEC 86.2 76.6 71.1 7.8 5.8 4.3 2021.0003 JAN 88.7 78.0 70.9 7.8 5.6 3.8 2021.0837 FEB 92.6 79.6 70.7 7.9 5.6 3.4 2021.1670 MAR 97.1 81.3 70.9 8.4 5.6 3.4 2021.2503 APR 101.5 83.2 70.8 9.0 5.6 3.1 2021.3337 MAY 106.5 85.3 70.8 10.1 5.8 2.9 2021.4170 JUN 112.9 87.4 71.1 10.9 6.0 2.9 2021.5003 JUL 117.8 89.7 71.6 11.0 6.1 2.8 2021.5837 AUG 121.2 92.3 72.2 11.0 6.2 2.8 2021.6670 SEP 124.3 94.9 72.8 10.5 6.2 2.8 2021.7503 OCT 127.5 97.5 73.3 9.9 6.1 2.9 2021.8337 NOV 133.0 100.1 74.5 9.3 6.1 3.1 2021.9170 DEC 139.4 102.9 76.0 8.8 6.1 3.2 2022.0003 JAN 145.3 105.8 76.3 8.8 6.4 3.6 2022.0837 FEB 151.2 108.7 76.5 10.0 6.7 4.2 2022.1670 MAR 158.2 111.6 77.1 10.4 7.2 4.8 2022.2503 APR 164.9 114.5 78.1 10.3 7.6 5.0 2022.3337 MAY 169.9 117.6 79.6 10.5 7.9 5.3 2022.4170 JUN 172.8 120.5 81.5 11.1 8.1 4.9 2022.5003 JUL 175.4 122.9 82.8 11.8 8.2 4.5 2022.5837 AUG 178.1 125.0 83.0 11.9 8.4 4.4 2022.6670 SEP 182.9 127.1 83.1 12.5 8.8 4.6 2022.7503 OCT 188.9 129.6 84.3 13.4 9.2 4.9 2022.8337 NOV 193.4 132.0 84.9 14.1 9.4 4.5 2022.9170 DEC 196.5 134.2 85.2 14.4 9.4 4.1 2023.0003 JAN 200.7 136.2 86.4 14.3 9.8 3.8 2023.0837 FEB 205.3 138.0 88.8 13.9 10.0 3.7 2023.1670 MAR 208.2 139.6 91.6 14.0 10.0 3.6 2023.2503 APR 210.4 141.1 94.0 14.4 10.0 3.5 2023.3337 MAY 212.6 142.2 95.2 15.2 9.9 3.3 2023.4170 JUN 214.9 143.0 94.8 15.4 9.9 3.3 2023.5003 JUL 218.0 143.8 93.6 15.0 10.1 3.7 2023.5837 AUG 221.0 144.1 93.4 14.8 10.2 4.3 2023.6670 SEP 222.1 144.4 94.2 14.3 10.2 4.6 2023.7503 OCT 220.5 144.7 95.2 13.7 10.0 4.6 2023.8337 NOV 219.8 145.0 96.9 13.7 10.0 4.8 2023.9170 DEC 220.8 145.1 98.7 13.5 10.1 4.9 2024.0003 JAN 220.9 144.5 99.8 12.8 9.8 4.7 2024.0837 FEB 218.1 143.5 100.6 12.5 9.7 4.8 2024.1670 MAR 214.1 142.8 101.6 12.3 9.2 5.0 2024.2503 APR 210.4 142.6 102.9 12.2 8.7 4.8 2024.3337 MAY 208.4 142.9 104.1 12.4 8.6 4.6 2024.4170 JUN 208.8 143.3 105.1 13.2 8.6 4.3 2024.5003 JUL 208.7 143.4 105.7 14.1 8.6 4.2 2024.5837 AUG 206.9 143.3 102.8 14.5 8.7 4.5 2024.6670 SEP 204.7 143.0 99.9 15.2 8.6 4.5 2024.7503 OCT 203.9 142.6 96.8 15.3 8.5 4.3 2024.8337 NOV 204.4 142.4 95.2 14.8 8.7 4.5 2024.9170 DEC 205.0 142.1 94.1 14.7 8.8 4.5 2025.0003 JAN 203.9 141.4 92.6 13.9 8.7 5.5 2025.0837 FEB 200.9 140.3 90.9 12.5 8.7 5.7 2025.1670 MAR 197.5 138.8 89.0 12.5 9.0 6.0 2025.2503 APR 194.8 137.2 88.3 13.0 9.4 6.1 2025.3337 MAY 191.7 135.6 87.3 13.6 9.6 6.4 2025.4170 JUN 188.1 134.4 86.9 14.7 10.0 6.6 2025.5003 JUL 185.5 133.0 86.7 15.6 10.4 6.9 2025.5837 AUG 182.3 131.4 86.6 16.4 10.2 6.8 2025.6670 SEP 178.7 129.6 87.0 16.8 10.3 6.6 2025.7503 OCT 176.1 128.1 87.7 17.4 10.6 6.7 2025.8337 NOV 173.5 127.0 88.0 17.3 10.6 6.5 2025.9170 DEC 171.2 126.0 88.6 16.7 10.6 6.3 2026.0003 JAN 168.1 124.5 89.4 15.7 10.6 6.2 2026.0837 FEB 164.6 122.7 89.2 14.4 10.7 6.1 2026.1670 MAR 162.0 121.6 89.0 13.9 11.2 6.6 2026.2503 APR 159.8 120.6 88.9 14.2 11.6 7.2 2026.3337 MAY 157.7 119.3 88.6 14.9 11.9 8.1 2026.4170 JUN 154.4 117.8 87.9 15.0 12.0 7.8 2026.5003 JUL 150.9 116.1 87.6 14.7 12.2 8.0 2026.5837 AUG 146.0 114.5 87.1 15.7 12.4 8.6 2026.6670 SEP 141.1 112.9 86.1 17.1 12.5 8.9 2026.7503 OCT 137.4 111.1 84.8 17.9 12.6 9.8 2026.8337 NOV 134.6 109.1 83.7 18.4 12.9 9.4 2026.9170 DEC 132.8 107.4 82.8 18.2 13.1 9.1 2027.0003 JAN 129.9 105.9 82.0 18.7 13.3 8.8 2027.0837 FEB 126.5 104.3 81.4 18.6 13.4 8.4 2027.1670 MAR 123.8 102.8 81.2 18.7 13.3 8.2 2027.2503 APR 122.7 101.5 80.6 19.2 13.2 8.2 2027.3337 MAY 122.5 100.1 79.9 19.5 13.0 8.0 2027.4170 JUN 122.4 98.5 79.1 20.0 12.7 7.0 2027.5003 JUL 122.3 97.2 78.3 20.5 12.3 6.1 2027.5837 AUG 121.7 96.0 77.4 20.9 12.0 5.9 2027.6670 SEP 121.5 94.9 76.5 21.2 11.8 5.8 2027.7503 OCT 120.4 93.8 76.0 21.5 11.8 5.7 2027.8337 NOV 118.4 93.0 75.8 21.2 11.5 5.6 2027.9170 DEC 116.2 92.0 75.3 20.5 11.2 5.5 2028.0003 JAN 114.7 91.0 74.4 19.5 11.0 5.7 2028.0837 FEB 114.0 90.0 73.7 18.8 10.9 6.0 2028.1670 MAR 113.1 89.2 72.9 18.5 11.2 6.2 2028.2503 APR 110.7 88.2 72.6 18.2 11.2 5.5 2028.3337 MAY 107.2 87.1 72.4 18.0 11.5 4.9 2028.4170 JUN 104.5 86.1 72.3 17.8 11.7 5.0 2028.5003 JUL 102.5 85.3 72.0 17.6 11.9 5.5 2028.5837 AUG 101.4 84.5 71.9 18.0 11.8 6.0 2028.6670 SEP 99.6 83.6 71.7 18.2 11.7 6.3 2028.7503 OCT 97.7 82.5 71.4 18.3 11.5 6.3 2028.8337 NOV 95.8 81.5 71.1 18.1 11.5 6.4 2028.9170 DEC 94.7 80.9 71.0 18.0 11.7 6.6 2029.0003 JAN 94.3 80.2 70.9 17.7 12.0 7.0 2029.0837 FEB 93.1 79.5 70.9 17.1 12.2 7.2 2029.1670 MAR 90.9 78.7 70.7 16.3 12.2 7.1 2029.2503 APR 89.0 78.0 70.5 16.3 11.8 6.9 2029.3337 MAY 87.5 77.3 70.2 16.3 11.5 6.7 2029.4170 JUN 86.1 76.7 70.0 16.3 11.3 6.4 2029.5003 JUL 85.4 76.1 70.0 16.3 11.2 5.8 2029.5837 AUG 84.8 75.7 69.8 16.7 11.3 5.7 2029.6670 SEP 83.5 75.2 69.6 17.1 11.4 6.1 2029.7503 OCT 82.0 74.8 68.9 17.1 11.3 6.5 2029.8337 NOV 80.1 74.2 68.8 16.9 11.2 6.6 2029.9170 DEC 79.1 73.6 68.6 16.6 10.9 6.5 2030.0003 JAN 78.2 72.9 68.4 15.5 10.5 6.4 2030.0837 FEB 77.5 72.4 68.1 13.9 9.9 6.3 2030.1670 MAR 77.0 71.9 68.1 12.7 9.5 6.0 2030.2503 APR 76.8 71.6 68.0 12.8 9.1 5.9 2030.3337 MAY 76.5 71.3 67.8 12.5 8.7 5.8 2030.4170 JUN 76.2 70.9 67.6 12.2 8.5 5.7 2030.5003 JUL 75.4 70.6 67.7 12.0 8.4 5.6 2030.5837 AUG 74.4 70.3 67.5 11.7 8.2 5.2 2030.6670 SEP 73.3 70.0 67.2 11.0 7.9 4.6 2030.7503 OCT 72.5 69.8 66.9 10.5 7.7 4.1 2030.8337 NOV 72.1 69.6 66.9 10.2 7.5 3.8 2030.9170 DEC 72.2 69.7 66.9 10.3 7.5 3.9 2031.0003 JAN 72.4 69.8 66.9 10.6 7.7 3.7 2031.0837 FEB 73.2 70.1 67.0 11.0 8.0 3.8 2031.1670 MAR 74.1 70.5 67.1 11.2 8.2 3.8 2031.2503 APR 74.9 70.9 67.2 11.4 8.3 3.5 2031.3337 MAY 76.2 71.3 67.4 11.6 8.5 3.4 2031.4170 JUN 77.9 71.9 67.5 11.8 8.6 3.4 2031.5003 JUL 79.4 72.6 67.7 12.0 8.8 3.3 2031.5837 AUG 80.8 73.4 67.8 12.4 9.1 3.3 2031.6670 SEP 83.2 74.2 68.0 12.7 9.4 3.4 2031.7503 OCT 86.2 75.2 68.1 13.2 9.9 3.7 2031.8337 NOV 90.9 76.4 68.4 13.8 10.3 4.2 2031.9170 DEC 95.1 77.8 68.5 14.6 10.6 4.5 2032.0003 JAN 98.5 79.4 68.5 15.7 10.9 4.7 2032.0837 FEB 103.6 81.1 68.5 16.1 11.1 4.8 2032.1670 MAR 109.2 83.1 68.5 16.3 11.3 5.0 2032.2503 APR 115.2 85.2 68.4 16.9 11.4 5.1 2032.3337 MAY 122.0 87.5 68.6 18.0 11.6 5.3 2032.4170 JUN 130.1 89.9 68.7 18.9 11.9 5.4 2032.5003 JUL 136.6 92.5 69.0 19.1 12.1 5.6 2032.5837 AUG 141.4 95.3 69.3 19.2 12.3 5.8 2032.6670 SEP 145.9 98.1 69.4 19.0 12.6 6.0 2032.7503 OCT 150.4 100.9 69.6 18.6 12.7 6.1 2032.8337 NOV 155.4 103.7 70.1 18.5 12.7 6.1 2032.9170 DEC 160.9 106.7 70.8 18.9 12.8 6.1 2033.0003 JAN 166.3 109.8 71.0 18.8 12.9 6.3 2033.0837 FEB 171.1 113.0 71.4 17.8 13.0 6.5 2033.1670 MAR 177.2 116.2 71.7 17.9 13.2 6.7 2033.2503 APR 184.3 119.3 72.3 18.4 13.4 7.1 2033.3337 MAY 189.1 122.6 73.1 19.1 13.7 7.0 2033.4170 JUN 192.1 125.6 73.5 19.6 14.2 7.0 2033.5003 JUL 195.2 128.1 74.3 20.3 14.5 7.1 2033.5837 AUG 198.1 130.2 74.9 20.3 14.5 7.2 2033.6670 SEP 203.0 132.5 75.3 20.3 14.6 7.7 2033.7503 OCT 208.8 135.1 75.8 20.5 14.7 8.1 2033.8337 NOV 213.0 137.6 76.2 20.8 14.8 8.0 2033.9170 DEC 215.9 139.9 76.5 21.2 14.8 8.0 2034.0003 JAN 219.7 141.9 76.5 21.3 14.6 8.4 2034.0837 FEB 223.3 143.7 76.5 21.4 14.6 8.6 2034.1670 MAR 224.8 145.3 76.8 21.6 14.6 8.4 2034.2503 APR 225.6 146.8 77.3 22.0 14.5 8.4 2034.3337 MAY 228.0 147.9 77.8 22.7 14.4 8.6 2034.4170 JUN 230.3 148.7 78.5 22.4 14.1 8.6 2034.5003 JUL 233.0 149.3 79.8 21.3 13.8 8.5 2034.5837 AUG 235.9 149.6 80.6 20.6 13.7 8.3 2034.6670 SEP 237.0 149.9 81.6 20.1 13.6 8.0 2034.7503 OCT 234.9 150.2 83.1 19.7 13.5 7.6 2034.8337 NOV 232.6 150.3 84.6 19.6 13.5 7.5 2034.9170 DEC 233.6 150.3 86.2 19.3 13.5 7.8 2035.0003 JAN 234.0 149.6 87.0 19.1 13.7 7.7 2035.0837 FEB 231.8 148.5 88.2 18.9 13.9 7.6 2035.1670 MAR 228.8 147.7 89.8 18.9 14.0 7.5 2035.2503 APR 225.5 147.5 90.9 19.5 13.9 7.2 2035.3337 MAY 224.0 147.8 93.0 20.4 14.0 7.1 2035.4170 JUN 225.0 148.2 94.3 22.0 14.4 7.1 2035.5003 JUL 224.9 148.2 95.7 23.4 14.7 7.1 2035.5837 AUG 223.7 148.0 96.0 24.0 14.9 7.3 2035.6670 SEP 222.8 147.6 95.6 25.1 15.1 7.3 2035.7503 OCT 222.5 147.2 95.5 25.7 15.3 7.0 2035.8337 NOV 222.1 147.0 97.0 24.9 15.3 7.1 2035.9170 DEC 221.5 146.6 97.8 24.8 15.3 6.7 2036.0003 JAN 220.9 145.8 97.3 24.0 15.3 6.3 2036.0837 FEB 218.8 144.6 96.5 22.2 15.3 6.1 2036.1670 MAR 215.7 143.1 96.4 22.5 15.5 6.3 2036.2503 APR 213.2 141.4 96.9 23.2 15.7 6.5 2036.3337 MAY 210.6 140.0 96.4 23.2 15.7 6.7 2036.4170 JUN 206.4 138.7 95.7 22.7 15.7 7.1 2036.5003 JUL 203.6 137.2 96.3 22.0 15.6 7.6 2036.5837 AUG 202.2 135.5 97.2 21.9 15.7 7.7 2036.6670 SEP 198.5 133.5 96.3 22.7 15.9 8.1 2036.7503 OCT 194.7 131.8 94.6 23.6 16.2 8.7 2036.8337 NOV 192.8 130.4 93.8 23.8 16.4 8.9 2036.9170 DEC 191.1 129.2 93.6 23.8 16.6 9.3 2037.0003 JAN 187.6 127.5 91.8 23.8 16.6 9.7 2037.0837 FEB 183.5 125.7 88.5 23.4 16.6 10.1 2037.1670 MAR 179.5 124.4 88.0 22.5 16.5 10.5 2037.2503 APR 175.8 123.3 88.7 22.7 16.4 10.7 2037.3337 MAY 173.5 121.9 87.3 22.9 16.5 11.5 2037.4170 JUN 171.4 120.3 86.3 23.0 16.6 11.7 2037.5003 JUL 167.1 118.5 85.7 22.4 16.7 11.9 2037.5837 AUG 160.7 116.7 84.9 21.5 16.5 11.9 2037.6670 SEP 155.0 115.0 83.7 21.2 16.3 11.7 2037.7503 OCT 151.3 113.1 82.7 21.7 16.1 11.4 2037.8337 NOV 148.8 111.2 82.3 21.7 16.1 11.5 2037.9170 DEC 146.2 109.6 82.2 22.1 16.1 11.4 2038.0003 JAN 143.2 108.0 82.0 22.5 16.2 11.2 2038.0837 FEB 139.6 106.4 81.0 22.3 16.2 11.0 2038.1670 MAR 135.9 104.8 80.6 22.3 16.0 10.8 2038.2503 APR 132.4 103.4 80.6 22.7 15.8 10.7 2038.3337 MAY 128.4 101.8 80.0 22.9 15.5 10.6 2038.4170 JUN 123.3 100.2 79.1 23.4 15.3 10.3 2038.5003 JUL 119.4 98.7 77.7 24.0 15.0 10.1 2038.5837 AUG 118.5 97.5 75.6 24.7 14.9 10.1 2038.6670 SEP 118.7 96.3 74.6 25.3 14.8 10.1 2038.7503 OCT 119.2 95.2 74.1 25.4 14.8 10.5 2038.8337 NOV 119.5 94.3 73.8 25.3 14.7 10.4 2038.9170 DEC 118.8 93.3 73.5 24.8 14.5 10.2 2039.0003 JAN 117.3 92.1 73.1 23.9 14.3 10.0 2039.0837 FEB 115.7 91.0 72.7 23.0 14.1 9.4 2039.1670 MAR 113.5 90.0 72.0 22.5 14.2 8.8 2039.2503 APR 110.0 89.0 71.4 22.1 14.2 8.1 2039.3337 MAY 105.8 87.8 71.1 21.8 14.3 7.5 2039.4170 JUN 103.2 86.8 70.8 21.4 14.5 7.4 2039.5003 JUL 101.6 85.9 70.6 20.8 14.4 7.7 2039.5837 AUG 100.1 85.1 70.6 20.0 14.3 8.1 2039.6670 SEP 98.1 84.1 70.4 20.0 14.1 8.5 2039.7503 OCT 96.5 83.0 69.9 20.2 13.9 8.5 2039.8337 NOV 94.6 82.0 69.6 19.8 13.7 8.5 2039.9170 DEC 93.5 81.3 69.5 19.4 13.6 8.4 2040.0003 JAN 93.1 80.6 69.5 18.9 13.6 8.4 2040.0837 FEB 92.3 80.0 69.3 18.2 13.6 8.1 2040.1670 MAR 91.2 79.2 69.2 17.3 13.5 7.7 2040.2503 APR 90.3 78.5 68.8 17.3 13.3 7.1 2040.3337 MAY 89.5 77.8 68.6 17.4 13.2 6.8 2040.4170 JUN 88.4 77.2 68.4 17.5 13.1 6.6 2040.5003 JUL 87.4 76.6 68.4 17.5 12.9 6.5 2040.5837 AUG 86.6 76.1 68.5 17.7 12.9 6.6 2040.6670 SEP 85.2 75.6 68.5 18.0 12.7 6.5 2040.7503 OCT 83.9 75.1 68.5 17.9 12.6 6.4 2040.8337 NOV 82.0 74.6 68.4 17.6 12.3 6.4 2040.9170 DEC 79.9 73.9 68.3 17.3 12.0 6.2 2041.0003 JAN 78.4 73.2 68.0 16.3 11.7 6.1 2041.0837 FEB 77.5 72.6 67.8 14.9 11.2 6.0 2041.1670 MAR 77.0 72.1 67.7 13.8 10.9 6.1 2041.2503 APR 76.9 71.8 67.6 13.9 10.5 6.2 2041.3337 MAY 76.6 71.5 67.5 13.6 10.2 6.2 2041.4170 JUN 76.5 71.1 67.3 13.2 9.8 6.0 2041.5003 JUL 76.1 70.8 67.1 12.9 9.5 5.9 2041.5837 AUG 75.1 70.5 67.1 12.6 9.3 5.8 2041.6670 SEP 74.2 70.2 67.0 11.9 9.1 5.7 2041.7503 OCT 74.0 70.0 67.0 11.4 8.9 5.2