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% 2020.4170 JUN 73.1 72.2 71.5 5.6 5.1 4.7 2020.5003 JUL 74.4 72.9 71.5 6.0 5.1 4.4 2020.5837 AUG 75.8 73.7 71.4 6.4 5.0 4.2 2020.6670 SEP 77.5 74.6 71.5 6.6 5.0 4.1 2020.7503 OCT 79.6 75.6 71.8 6.7 5.2 4.1 2020.8337 NOV 83.5 76.8 72.2 6.9 5.4 4.3 2020.9170 DEC 86.8 78.3 72.8 7.1 5.5 4.1 2021.0003 JAN 89.3 79.8 72.9 7.1 5.4 3.7 2021.0837 FEB 93.1 81.7 73.0 7.6 5.4 3.3 2021.1670 MAR 97.7 83.7 73.5 8.2 5.4 3.3 2021.2503 APR 102.2 85.9 73.8 8.8 5.4 2.9 2021.3337 MAY 107.4 88.3 74.2 9.9 5.6 2.7 2021.4170 JUN 113.8 90.8 75.0 10.7 5.8 2.7 2021.5003 JUL 118.8 93.5 75.6 10.9 6.0 2.6 2021.5837 AUG 122.4 96.3 76.5 10.8 6.1 2.6 2021.6670 SEP 125.5 99.2 77.4 10.3 6.1 2.6 2021.7503 OCT 129.8 102.0 78.2 9.7 6.0 2.8 2021.8337 NOV 135.5 104.9 79.7 9.1 5.9 2.9 2021.9170 DEC 142.1 108.0 80.9 8.6 6.0 3.0 2022.0003 JAN 148.2 111.3 81.3 8.6 6.2 3.4 2022.0837 FEB 154.3 114.6 81.9 9.6 6.6 4.1 2022.1670 MAR 162.4 117.8 82.7 10.0 7.0 4.7 2022.2503 APR 170.3 121.0 84.0 10.0 7.4 4.9 2022.3337 MAY 175.5 124.3 85.8 10.1 7.7 5.2 2022.4170 JUN 178.6 127.4 87.8 10.7 7.9 4.7 2022.5003 JUL 181.2 129.9 89.2 11.4 8.0 4.3 2022.5837 AUG 183.5 132.1 89.5 11.5 8.2 4.2 2022.6670 SEP 187.6 134.4 89.7 12.1 8.6 4.4 2022.7503 OCT 193.8 137.0 91.4 13.0 9.1 4.7 2022.8337 NOV 198.9 139.6 92.4 13.7 9.2 4.3 2022.9170 DEC 202.4 141.9 92.8 14.0 9.3 4.0 2023.0003 JAN 207.0 143.8 94.0 14.1 9.7 3.8 2023.0837 FEB 211.6 145.7 96.2 14.1 10.0 3.6 2023.1670 MAR 214.5 147.2 99.1 14.4 10.0 3.5 2023.2503 APR 216.8 148.7 102.3 14.8 10.0 3.5 2023.3337 MAY 218.9 149.9 103.6 15.7 9.9 3.4 2023.4170 JUN 220.7 150.6 103.5 15.9 9.9 3.4 2023.5003 JUL 223.7 151.2 102.2 15.4 10.1 3.9 2023.5837 AUG 226.8 151.5 102.0 15.2 10.3 4.4 2023.6670 SEP 227.9 151.7 102.7 14.7 10.2 4.7 2023.7503 OCT 226.8 152.0 103.7 14.1 10.0 4.6 2023.8337 NOV 226.0 152.1 105.2 14.0 10.0 4.8 2023.9170 DEC 226.9 152.0 106.9 13.8 10.1 5.0 2024.0003 JAN 226.8 151.3 107.8 13.0 9.8 4.7 2024.0837 FEB 223.9 150.1 108.5 12.5 9.7 4.9 2024.1670 MAR 219.8 149.3 109.0 12.2 9.2 5.1 2024.2503 APR 216.1 149.1 109.8 12.0 8.7 4.9 2024.3337 MAY 214.1 149.4 110.7 12.3 8.6 4.7 2024.4170 JUN 214.5 149.8 111.4 13.3 8.5 4.4 2024.5003 JUL 214.3 149.7 110.1 14.3 8.5 4.3 2024.5837 AUG 212.4 149.5 107.0 14.7 8.6 4.6 2024.6670 SEP 210.5 149.1 103.8 15.4 8.6 4.6 2024.7503 OCT 210.0 148.7 100.4 15.5 8.5 4.4 2024.8337 NOV 210.2 148.5 99.1 15.0 8.7 4.6 2024.9170 DEC 209.8 148.1 97.9 14.9 8.7 4.6 2025.0003 JAN 208.7 147.3 96.3 13.9 8.6 5.4 2025.0837 FEB 205.9 146.1 94.4 12.4 8.6 5.5 2025.1670 MAR 203.2 144.5 92.5 12.4 8.8 5.8 2025.2503 APR 200.4 142.9 91.5 12.9 9.2 5.9 2025.3337 MAY 197.4 141.4 90.6 13.2 9.4 6.1 2025.4170 JUN 193.7 140.2 89.9 14.1 9.8 6.4 2025.5003 JUL 190.9 138.7 89.6 14.8 10.1 6.6 2025.5837 AUG 187.6 136.9 89.4 15.5 9.9 6.4 2025.6670 SEP 183.5 134.8 89.7 15.9 10.0 6.3 2025.7503 OCT 180.6 133.0 90.2 16.4 10.3 6.4 2025.8337 NOV 177.9 131.6 90.3 16.3 10.3 6.2 2025.9170 DEC 176.0 130.3 90.9 15.7 10.4 6.0 2026.0003 JAN 173.3 128.5 91.6 14.7 10.4 5.9 2026.0837 FEB 169.7 126.6 91.4 13.8 10.5 5.9 2026.1670 MAR 166.3 125.4 91.2 13.3 11.0 6.4 2026.2503 APR 163.4 124.2 90.9 14.0 11.4 7.0 2026.3337 MAY 161.2 122.8 90.5 14.7 11.7 7.9 2026.4170 JUN 159.5 121.2 89.9 15.0 11.9 7.8 2026.5003 JUL 155.9 119.3 89.6 14.7 12.2 8.2 2026.5837 AUG 150.7 117.4 89.3 15.7 12.4 8.7 2026.6670 SEP 145.4 115.7 88.2 17.0 12.5 9.0 2026.7503 OCT 141.8 113.8 86.9 17.8 12.5 9.6 2026.8337 NOV 139.5 111.9 85.9 18.3 12.8 9.6 2026.9170 DEC 137.7 110.2 84.7 18.1 13.1 9.3 2027.0003 JAN 134.9 108.7 84.0 18.6 13.2 9.0 2027.0837 FEB 131.5 107.1 83.3 18.4 13.2 8.5 2027.1670 MAR 128.3 105.5 83.1 18.5 13.1 8.3 2027.2503 APR 126.0 104.0 82.4 19.0 13.1 8.3 2027.3337 MAY 125.0 102.4 81.5 19.3 12.8 8.0 2027.4170 JUN 124.2 100.7 80.4 19.7 12.5 7.0 2027.5003 JUL 123.9 99.1 79.5 20.2 12.1 6.0 2027.5837 AUG 123.3 97.9 78.4 20.7 11.8 5.9 2027.6670 SEP 122.9 96.7 77.5 21.1 11.6 5.8 2027.7503 OCT 121.8 95.6 76.9 21.4 11.7 5.8 2027.8337 NOV 119.7 94.7 76.7 21.1 11.4 5.7 2027.9170 DEC 117.4 93.6 76.1 20.3 11.1 5.7 2028.0003 JAN 116.1 92.4 75.2 19.4 10.9 5.9 2028.0837 FEB 115.2 91.3 74.4 18.7 10.9 6.1 2028.1670 MAR 113.9 90.3 73.5 18.5 11.1 5.8 2028.2503 APR 111.4 89.2 73.0 18.2 11.2 5.1 2028.3337 MAY 107.8 88.0 72.8 18.0 11.4 4.6 2028.4170 JUN 104.9 87.0 72.6 17.8 11.7 4.6 2028.5003 JUL 102.9 86.1 72.3 17.6 11.9 5.1 2028.5837 AUG 101.7 85.2 72.1 18.0 11.8 5.7 2028.6670 SEP 99.8 84.2 71.9 18.2 11.7 6.0 2028.7503 OCT 98.1 83.2 71.6 18.3 11.4 6.0 2028.8337 NOV 96.1 82.2 71.4 18.1 11.5 6.1 2028.9170 DEC 95.1 81.5 71.4 17.9 11.7 6.4 2029.0003 JAN 94.7 80.8 71.3 17.7 12.0 6.7 2029.0837 FEB 93.5 80.1 71.4 17.1 12.2 7.0 2029.1670 MAR 91.4 79.4 71.3 16.2 12.1 7.0 2029.2503 APR 89.6 78.7 71.0 16.3 11.8 6.7 2029.3337 MAY 88.1 78.0 70.9 16.3 11.5 6.5 2029.4170 JUN 86.8 77.3 70.7 16.2 11.2 6.1 2029.5003 JUL 86.0 76.7 70.5 16.3 11.2 5.6 2029.5837 AUG 85.4 76.2 70.3 16.7 11.4 5.5 2029.6670 SEP 84.0 75.7 70.0 17.2 11.4 5.9 2029.7503 OCT 82.6 75.2 69.3 17.1 11.3 6.3 2029.8337 NOV 80.7 74.7 69.2 16.9 11.2 6.4 2029.9170 DEC 79.5 74.0 68.9 16.6 10.9 6.4 2030.0003 JAN 78.6 73.3 68.6 15.5 10.4 6.3 2030.0837 FEB 77.9 72.7 68.4 13.9 9.9 6.1 2030.1670 MAR 77.3 72.2 68.2 12.7 9.4 5.8 2030.2503 APR 77.1 71.9 68.2 12.8 9.1 5.7 2030.3337 MAY 76.8 71.5 68.0 12.5 8.7 5.6 2030.4170 JUN 76.5 71.2 67.8 12.1 8.5 5.5 2030.5003 JUL 75.8 70.9 67.9 12.0 8.4 5.4 2030.5837 AUG 74.7 70.6 67.7 11.7 8.2 5.0 2030.6670 SEP 73.6 70.3 67.4 11.0 7.9 4.5 2030.7503 OCT 72.8 70.1 67.1 10.5 7.7 4.0 2030.8337 NOV 72.3 69.9 67.1 10.2 7.5 3.7 2030.9170 DEC 72.4 69.9 67.1 10.3 7.6 3.8 2031.0003 JAN 72.6 70.0 67.1 10.6 7.7 3.6 2031.0837 FEB 73.4 70.3 67.1 11.0 8.0 3.7 2031.1670 MAR 74.3 70.7 67.3 11.2 8.2 3.7 2031.2503 APR 75.1 71.1 67.3 11.4 8.3 3.5 2031.3337 MAY 76.3 71.5 67.5 11.6 8.5 3.3 2031.4170 JUN 78.0 72.0 67.6 11.8 8.7 3.3 2031.5003 JUL 79.5 72.7 67.7 12.0 8.8 3.3 2031.5837 AUG 80.9 73.4 67.9 12.4 9.1 3.3 2031.6670 SEP 83.2 74.3 68.0 12.7 9.5 3.3 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