SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 26 July, 2026 T-index: 72 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 29-33 1E 10 1 5 10 15 20 25 30 35 40 2F 49-54 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.7 7.3 3.7 AXMMMF%% .. 6.5 4.3 2.5 00 01 10.0 9.0 4.4 ASXMMMB% %.. 7.4 5.3 3.0 01 02 10.5 9.9 4.8 SXMMMMF %%.. 7.8 5.8 3.2 02 03 10.6 10.5 5.0 SXXMMMB %%... 7.9 6.1 3.4 03 04 10.4 10.7 5.1 ASXMMMB %%.. 7.9 6.3 3.5 04 05 10.2 10.7 5.1 ASXMMMB %%.. 7.9 6.2 3.5 05 06 10.0 10.3 4.9 SXMMMMP %... 7.8 6.0 3.4 06 07 9.9 9.7 4.7 SXMMMM% %... 7.8 5.6 3.2 07 08 9.9 8.6 4.2 ASMMMMM% %... 7.6 5.0 2.9 08 09 9.6 6.5 3.3 SMMMMMF% %.. 7.3 3.6 2.3 09 10 7.7 1.5 0.0 MMMMMMM%%. .. 5.9 0.8 0.0 10 11 6.0 1.5 0.0 MMMMMM%... 4.7 0.8 0.0 11 12 4.9 1.5 0.0 MMMMM%.. 4.0 0.8 0.0 12 13 4.5 1.5 0.0 MMMM%... 3.7 0.8 0.0 13 14 4.2 1.5 0.0 MMMM%.. 3.6 0.8 0.0 14 15 4.1 1.5 0.0 MMMM%.. 3.5 0.8 0.0 15 16 4.1 1.5 0.0 MMMM%.. 3.5 0.8 0.0 16 17 4.0 1.5 0.0 MMMM%.. 3.4 0.8 0.0 17 18 3.9 1.5 0.0 MMMM%.. 3.4 0.8 0.0 18 19 3.9 1.5 0.0 MMMM%.. 3.3 0.8 0.0 19 20 3.8 1.5 0.0 MMMM%. 3.2 0.8 0.0 20 21 3.6 1.5 0.0 MMMM.. 3.1 0.8 0.0 21 22 3.7 1.5 0.0 MMMM. 3.2 0.8 0.0 22 23 5.8 1.5 0.0 MMMMM%.. 4.6 0.8 0.0 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) 26-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000