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% 2024.4170 JUN 189.3 185.6 182.3 13.0 12.1 11.4 2024.5003 JUL 190.7 185.1 178.4 14.0 12.3 10.9 2024.5837 AUG 193.2 184.4 174.6 14.6 12.5 10.9 2024.6670 SEP 195.9 183.5 170.5 15.4 12.6 10.4 2024.7503 OCT 197.4 182.6 166.3 15.6 12.8 10.1 2024.8337 NOV 197.7 181.9 163.8 15.2 12.9 10.3 2024.9170 DEC 197.0 181.0 161.3 15.5 13.0 10.0 2025.0003 JAN 197.6 179.6 158.5 15.1 13.0 9.9 2025.0837 FEB 197.6 177.6 155.4 15.8 13.2 9.9 2025.1670 MAR 198.0 175.0 152.0 17.1 13.5 10.2 2025.2503 APR 199.1 172.5 149.1 18.2 13.8 10.3 2025.3337 MAY 199.2 170.5 146.3 19.0 13.9 10.4 2025.4170 JUN 198.4 168.5 144.1 19.7 14.1 10.6 2025.5003 JUL 196.6 165.9 140.7 20.3 14.2 10.6 2025.5837 AUG 194.7 163.1 138.7 21.3 14.3 10.6 2025.6670 SEP 191.1 159.7 136.2 21.9 14.6 10.8 2025.7503 OCT 187.9 156.5 133.7 22.4 14.9 10.4 2025.8337 NOV 186.6 153.8 132.3 22.5 15.0 10.3 2025.9170 DEC 185.4 151.3 130.7 22.0 15.1 10.6 2026.0003 JAN 183.2 148.5 127.4 21.0 15.2 10.6 2026.0837 FEB 179.8 146.0 124.6 21.1 15.2 10.4 2026.1670 MAR 175.8 144.0 123.5 21.1 15.2 10.7 2026.2503 APR 172.0 142.2 121.2 21.4 15.3 11.2 2026.3337 MAY 169.7 140.1 118.4 21.9 15.5 11.3 2026.4170 JUN 167.8 137.9 116.4 22.1 15.7 11.1 2026.5003 JUL 163.7 135.0 114.1 21.5 15.8 11.1 2026.5837 AUG 157.8 132.0 111.6 20.6 15.7 11.7 2026.6670 SEP 153.1 129.6 109.1 21.4 15.7 12.1 2026.7503 OCT 151.2 127.2 106.9 21.8 15.5 12.7 2026.8337 NOV 150.1 124.7 104.8 21.8 15.6 12.5 2026.9170 DEC 148.2 122.6 103.6 21.4 15.7 12.0 2027.0003 JAN 145.0 120.6 102.9 21.6 15.8 11.8 2027.0837 FEB 141.3 118.2 101.0 21.4 15.8 11.9 2027.1670 MAR 138.4 115.7 98.8 21.3 15.6 11.4 2027.2503 APR 137.2 113.5 96.1 21.5 15.3 11.0 2027.3337 MAY 136.3 111.4 92.9 21.6 15.0 10.5 2027.4170 JUN 134.9 109.0 90.4 22.2 14.8 9.7 2027.5003 JUL 133.7 106.9 88.3 22.6 14.4 8.7 2027.5837 AUG 132.1 105.3 86.5 23.1 14.1 8.5 2027.6670 SEP 131.3 103.9 85.3 23.4 14.0 8.3 2027.7503 OCT 130.1 102.6 84.6 23.6 14.0 8.2 2027.8337 NOV 128.1 101.7 84.5 23.6 13.8 8.4 2027.9170 DEC 126.2 100.7 84.0 23.1 13.7 8.8 2028.0003 JAN 124.4 99.3 82.9 22.4 13.6 9.1 2028.0837 FEB 123.2 97.7 81.6 21.7 13.6 9.4 2028.1670 MAR 121.5 96.1 80.4 21.5 13.7 8.8 2028.2503 APR 118.3 94.5 79.6 21.2 13.8 8.1 2028.3337 MAY 115.5 92.9 79.2 21.1 14.0 7.5 2028.4170 JUN 112.9 91.6 78.8 20.7 14.1 7.4 2028.5003 JUL 110.3 90.6 78.3 20.1 14.1 7.7 2028.5837 AUG 108.2 89.4 77.8 20.0 14.0 8.1 2028.6670 SEP 106.5 88.0 77.2 20.2 13.9 8.4 2028.7503 OCT 104.2 86.6 76.5 20.3 13.7 8.4 2028.8337 NOV 101.9 85.4 75.6 19.9 13.6 8.4 2028.9170 DEC 100.2 84.4 75.4 19.5 13.5 8.4 2029.0003 JAN 98.8 83.4 75.1 19.0 13.5 8.4 2029.0837 FEB 97.2 82.6 74.6 18.3 13.5 8.4 2029.1670 MAR 95.3 81.9 74.4 17.4 13.3 8.0 2029.2503 APR 93.4 81.2 74.1 17.4 13.1 7.6 2029.3337 MAY 92.4 80.5 73.7 17.5 12.9 7.5 2029.4170 JUN 91.3 79.8 73.6 17.6 12.8 7.3 2029.5003 JUL 90.2 79.1 73.4 17.6 12.6 7.1 2029.5837 AUG 89.3 78.5 73.0 17.7 12.6 7.1 2029.6670 SEP 87.7 77.9 72.6 17.9 12.5 7.0 2029.7503 OCT 86.2 77.4 72.1 17.8 12.4 6.8 2029.8337 NOV 84.2 76.8 72.0 17.5 12.2 6.7 2029.9170 DEC 82.7 76.0 71.8 17.2 11.9 6.5 2030.0003 JAN 81.2 75.1 71.2 16.2 11.5 6.3 2030.0837 FEB 80.2 74.3 70.6 14.8 11.2 6.2 2030.1670 MAR 79.5 73.7 70.2 13.9 10.8 6.2 2030.2503 APR 79.1 73.2 69.9 14.0 10.5 6.2 2030.3337 MAY 78.8 72.7 69.9 13.6 10.1 6.2 2030.4170 JUN 78.5 72.3 69.6 13.2 9.8 6.1 2030.5003 JUL 77.5 71.9 69.2 12.9 9.5 6.0 2030.5837 AUG 76.4 71.6 68.9 12.6 9.3 5.9 2030.6670 SEP 75.4 71.4 68.6 11.9 9.1 5.7 2030.7503 OCT 74.9 71.2 68.4 11.4 8.8 5.2 2030.8337 NOV 74.5 71.0 68.4 11.3 8.6 4.9 2030.9170 DEC 74.4 70.9 68.3 11.2 8.6 4.9 2031.0003 JAN 74.4 70.9 68.2 11.4 8.7 4.7 2031.0837 FEB 75.0 71.1 68.1 11.7 8.8 4.6 2031.1670 MAR 75.8 71.4 68.2 11.8 8.9 4.5 2031.2503 APR 76.3 71.7 68.1 12.0 9.0 4.2 2031.3337 MAY 77.4 72.0 68.1 12.1 9.1 4.0 2031.4170 JUN 78.9 72.5 68.2 12.2 9.1 3.8 2031.5003 JUL 80.2 73.1 68.2 12.3 9.2 3.7 2031.5837 AUG 81.4 73.7 68.2 12.6 9.4 3.6 2031.6670 SEP 83.6 74.5 68.2 12.9 9.6 3.6 2031.7503 OCT 86.4 75.3 68.2 13.3 10.0 3.8 2031.8337 NOV 90.8 76.4 68.4 13.8 10.3 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