SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 3 November, 2025 T-index: 108 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 30-42 1E 10 1 5 10 15 20 25 30 35 40 2F 50-61 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.1 9.8 5.0 SXMMMB% %.. 7.3 5.8 3.4 00 01 9.5 10.9 5.4 ASXMMMP %.. 7.7 6.4 3.7 01 02 9.9 11.6 5.7 ASXMMMP P%.. 8.1 6.8 3.8 02 03 10.3 12.0 5.9 ASXXMMM PP.. 8.5 7.1 4.0 03 04 10.6 12.2 5.9 ASXXMMM PP%.. 8.8 7.2 4.0 04 05 10.9 12.1 5.9 ASXXMMM MP%.. 9.0 7.1 4.0 05 06 10.7 11.9 5.8 ASXMMMM P%%.. 8.8 7.0 4.0 06 07 10.3 11.4 5.6 ASXMMMM P%.. 8.5 6.7 3.8 07 08 10.0 10.6 5.3 ASXMMMM %%.. 8.3 6.2 3.6 08 09 10.0 9.4 4.8 SXMMMMM %%.. 8.1 5.5 3.3 09 10 9.7 7.6 4.0 AXMMMMM% %%.. 7.8 4.4 2.7 10 11 9.3 1.6 0.0 MMMMMMMMM% %.. 7.5 0.9 0.0 11 12 8.6 1.6 0.0 MMMMMMMM%% .. 7.0 0.9 0.0 12 13 7.9 1.6 0.0 MMMMMMMM%. . 6.5 0.9 0.0 13 14 7.5 1.6 0.0 MMMMMMM%%. . 6.2 0.9 0.0 14 15 7.2 1.6 0.0 MMMMMMM%%. . 6.0 0.9 0.0 15 16 7.1 1.6 0.0 MMMMMMM%.. 5.8 0.9 0.0 16 17 6.7 1.6 0.0 MMMMMMM%.. 5.6 0.9 0.0 17 18 6.2 1.6 0.0 MMMMMM%.. 5.2 0.9 0.0 18 19 5.7 1.6 0.0 MMMMMM%. 4.8 0.9 0.0 19 20 5.4 1.6 0.0 MMMMM%.. 4.7 0.9 0.0 20 21 5.6 1.6 0.0 MMMMMM%. 4.8 0.9 0.0 21 22 6.9 4.8 2.7 AMMMMM%.. 5.7 2.4 2.0 22 23 8.4 8.2 4.3 ASMMMM%% .. 6.7 4.8 2.9 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) 3-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000