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% 2024.2503 APR 179.8 174.5 170.2 11.5 10.8 9.8 2024.3337 MAY 185.4 174.4 167.6 12.2 10.8 9.6 2024.4170 JUN 189.2 174.4 165.5 13.3 10.9 9.2 2024.5003 JUL 190.3 173.9 162.7 14.4 11.1 8.7 2024.5837 AUG 192.0 173.3 158.3 15.0 11.3 8.7 2024.6670 SEP 193.0 172.6 154.4 15.8 11.4 8.5 2024.7503 OCT 194.1 171.8 150.4 16.1 11.5 8.1 2024.8337 NOV 196.1 171.2 148.2 15.7 11.7 7.9 2024.9170 DEC 194.1 170.5 146.0 15.9 11.8 7.7 2025.0003 JAN 193.1 169.3 143.8 15.5 11.9 7.8 2025.0837 FEB 192.8 167.6 141.1 15.5 12.1 7.9 2025.1670 MAR 193.5 165.3 138.2 16.2 12.4 8.3 2025.2503 APR 194.4 163.1 136.3 17.4 12.7 8.9 2025.3337 MAY 194.4 161.3 133.8 18.1 12.9 9.3 2025.4170 JUN 193.1 159.5 132.0 18.9 13.2 9.9 2025.5003 JUL 190.5 157.3 130.1 19.6 13.4 10.1 2025.5837 AUG 188.1 154.8 128.9 20.6 13.5 10.1 2025.6670 SEP 184.9 151.8 127.4 21.2 13.8 10.5 2025.7503 OCT 181.7 149.1 125.8 21.7 14.1 10.2 2025.8337 NOV 180.1 146.8 124.0 21.8 14.1 10.3 2025.9170 DEC 179.3 144.7 122.6 21.2 14.3 10.6 2026.0003 JAN 177.4 142.3 120.6 20.7 14.3 10.5 2026.0837 FEB 174.2 140.0 117.0 20.7 14.3 10.3 2026.1670 MAR 170.4 138.3 115.1 20.8 14.4 10.6 2026.2503 APR 166.8 136.7 114.0 21.2 14.6 11.0 2026.3337 MAY 164.6 134.8 111.7 21.7 14.9 11.1 2026.4170 JUN 162.9 132.8 110.3 21.8 15.1 10.8 2026.5003 JUL 159.2 130.3 108.4 21.2 15.1 10.8 2026.5837 AUG 153.2 127.6 106.0 20.4 15.2 11.4 2026.6670 SEP 148.8 125.4 103.6 20.8 15.2 11.7 2026.7503 OCT 146.6 123.1 101.6 21.3 15.1 12.5 2026.8337 NOV 145.7 120.8 99.7 21.4 15.2 12.2 2026.9170 DEC 143.9 118.8 98.3 21.1 15.4 11.7 2027.0003 JAN 140.9 116.9 97.3 21.3 15.6 11.6 2027.0837 FEB 137.8 114.7 95.8 21.1 15.5 11.5 2027.1670 MAR 134.7 112.5 94.0 21.1 15.3 11.0 2027.2503 APR 133.8 110.6 91.6 21.3 15.0 10.7 2027.3337 MAY 133.0 108.6 88.6 21.5 14.8 10.3 2027.4170 JUN 132.0 106.4 86.4 22.1 14.6 9.5 2027.5003 JUL 131.0 104.5 84.7 22.5 14.2 8.5 2027.5837 AUG 129.5 103.0 83.2 23.0 13.9 8.3 2027.6670 SEP 128.6 101.7 82.1 23.3 13.7 8.0 2027.7503 OCT 127.4 100.5 81.6 23.5 13.7 7.9 2027.8337 NOV 125.5 99.7 81.5 23.4 13.6 8.1 2027.9170 DEC 123.6 98.7 81.0 23.0 13.5 8.4 2028.0003 JAN 122.0 97.3 80.1 22.2 13.4 8.8 2028.0837 FEB 121.0 95.9 79.0 21.6 13.4 9.2 2028.1670 MAR 119.4 94.5 78.0 21.4 13.6 8.6 2028.2503 APR 116.6 93.0 77.5 21.2 13.7 7.9 2028.3337 MAY 114.1 91.5 77.0 21.0 13.9 7.3 2028.4170 JUN 111.5 90.3 76.8 20.6 14.0 7.3 2028.5003 JUL 108.9 89.3 76.4 20.1 14.0 7.6 2028.5837 AUG 107.0 88.2 75.9 19.9 13.9 8.0 2028.6670 SEP 105.4 86.9 75.5 20.1 13.9 8.4 2028.7503 OCT 103.1 85.6 75.1 20.2 13.7 8.4 2028.8337 NOV 100.8 84.4 74.3 19.9 13.5 8.4 2028.9170 DEC 99.3 83.5 74.2 19.5 13.4 8.3 2029.0003 JAN 98.0 82.7 74.5 18.9 13.4 8.3 2029.0837 FEB 96.4 81.9 74.2 18.2 13.3 8.3 2029.1670 MAR 94.5 81.1 74.0 17.3 13.1 8.1 2029.2503 APR 92.6 80.4 73.7 17.2 12.7 7.7 2029.3337 MAY 91.6 79.8 73.4 17.3 12.5 7.6 2029.4170 JUN 90.5 79.1 73.2 17.4 12.4 7.4 2029.5003 JUL 89.5 78.4 73.1 17.4 12.3 7.2 2029.5837 AUG 88.6 77.8 72.8 17.5 12.2 6.9 2029.6670 SEP 87.1 77.3 72.6 17.3 12.1 7.1 2029.7503 OCT 85.6 76.8 72.1 17.3 12.0 7.0 2029.8337 NOV 83.6 76.2 72.0 17.0 11.8 6.9 2029.9170 DEC 82.2 75.4 71.6 16.8 11.6 6.7 2030.0003 JAN 80.8 74.6 71.0 15.9 11.3 6.5 2030.0837 FEB 79.8 73.9 70.5 14.5 10.9 6.4 2030.1670 MAR 79.1 73.3 70.0 13.9 10.7 6.3 2030.2503 APR 78.7 72.8 69.8 13.9 10.4 6.3 2030.3337 MAY 78.5 72.3 69.5 13.6 10.1 6.3 2030.4170 JUN 78.2 72.0 69.2 13.2 9.7 6.1 2030.5003 JUL 77.3 71.6 69.0 12.9 9.4 6.0 2030.5837 AUG 76.1 71.3 68.7 12.6 9.2 5.9 2030.6670 SEP 75.1 71.1 68.4 11.9 8.9 5.7 2030.7503 OCT 74.7 70.8 68.3 11.4 8.7 5.1 2030.8337 NOV 74.2 70.6 68.4 11.2 8.5 4.8 2030.9170 DEC 74.2 70.6 68.3 11.2 8.5 4.8 2031.0003 JAN 74.2 70.6 68.1 11.4 8.5 4.6 2031.0837 FEB 74.8 70.9 68.1 11.7 8.7 4.6 2031.1670 MAR 75.6 71.2 68.1 11.8 8.8 4.5 2031.2503 APR 76.2 71.5 68.1 12.0 8.9 4.1 2031.3337 MAY 77.2 71.8 68.1 12.1 9.0 3.9 2031.4170 JUN 78.8 72.3 68.1 12.2 9.1 3.8 2031.5003 JUL 80.1 73.0 68.2 12.3 9.2 3.7 2031.5837 AUG 81.4 73.6 68.2 12.6 9.4 3.6 2031.6670 SEP 83.5 74.4 68.2 12.9 9.6 3.5 2031.7503 OCT 86.3 75.3 68.2 13.3 10.0 3.8 2031.8337 NOV 90.8 76.4 68.4 13.8 10.4 4.2 2031.9170 DEC 95.2 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 208.9 135.1 75.8 20.5 14.7 8.1 2033.8337 NOV 213.1 137.6 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 198.4 133.5 96.3 22.7 15.9 8.1 2036.7503 OCT 194.6 131.8 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 88.4 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 160.8 116.7 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 118.6 97.5 75.7 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 70.5 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 68.1 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