SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 24 October, 2025 T-index: 120 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 39-51 1E 15 1 5 10 15 20 25 30 35 40 2F 58-68 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.6 8.2 4.2 SMMMMM% . 7.6 5.0 3.4 00 01 9.0 8.9 4.5 AXMMMM% .. 8.1 5.5 3.6 01 02 9.5 9.4 4.7 AXMMMMM %. 8.5 5.8 3.8 02 03 10.0 9.7 4.8 AXMMMMM %.. 9.0 6.0 3.9 03 04 10.3 9.8 4.9 AXMMMMM %%. 9.1 6.0 3.9 04 05 10.4 9.8 4.8 AXMMMMM %%. 9.2 6.0 3.9 05 06 10.1 9.5 4.7 AXMMMMM %%. 9.0 5.8 3.8 06 07 9.7 9.0 4.5 AXMMMMM %.. 8.6 5.5 3.7 07 08 9.5 8.3 4.2 SMMMMMM %. 8.4 5.0 3.4 08 09 9.4 7.2 3.8 XMMMMM% %. 8.2 4.4 3.1 09 10 9.2 5.4 2.9 XMMMMMM% .. 8.0 3.1 2.4 10 11 8.6 1.3 0.0 MMMMMMMMM% .. 7.5 0.8 0.0 11 12 7.9 1.3 0.0 MMMMMMMM%. . 7.1 0.8 0.0 12 13 7.2 1.3 0.0 MMMMMMM%.. 6.5 0.8 0.0 13 14 6.7 1.3 0.0 MMMMMMM%. 6.1 0.8 0.0 14 15 6.4 1.3 0.0 MMMMMMM.. 5.8 0.8 0.0 15 16 6.0 1.3 0.0 MMMMMM%.. 5.5 0.8 0.0 16 17 5.7 1.3 0.0 MMMMMM%. 5.2 0.8 0.0 17 18 5.4 1.3 0.0 MMMMMM.. 5.0 0.8 0.0 18 19 5.1 1.3 0.0 MMMMM%. 4.7 0.8 0.0 19 20 4.9 1.3 0.0 MMMMM%. 4.6 0.8 0.0 20 21 5.1 1.3 0.0 MMMMM%. 4.7 0.8 0.0 21 22 6.6 4.9 2.7 MMMMM%. 5.8 2.7 2.3 22 23 7.9 7.0 3.7 AXMMMM%. 6.9 4.2 3.0 23 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT =============================================================================== |. USABLE LESS THAN 50% OF DAYS |% USABLE 50% TO 90% OF DAYS | |B BOTH E and F MODES 90% OF DAYS |M MIXED FIRST AND SECOND F MODES | |F FIRST F MODE ONLY |E E-LAYER PROPAGATION |P 90% E and 50-90% F | |S SECOND MODES ONLY |A HIGH ABSORPTION |X COMPLEX MODES | (c) 24-Oct-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000