SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 29 July, 2026 T-index: 85 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 29-34 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 9.2 7.5 3.8 AXMMMMF% .. 6.8 4.4 2.6 00 01 10.7 9.1 4.5 SXMMMMF %%.. 7.9 5.4 3.1 01 02 11.2 10.1 4.9 SXMMMMB F%%.. 8.3 5.9 3.3 02 03 11.3 10.7 5.1 ASXMMMB F%%.. 8.5 6.3 3.5 03 04 11.0 10.9 5.2 ASXMMMB %%... 8.5 6.4 3.6 04 05 10.8 10.8 5.2 ASXMMMB %%.. 8.4 6.4 3.5 05 06 10.7 10.5 5.1 ASXMMMB %%.. 8.4 6.2 3.5 06 07 10.5 9.9 4.8 SXMMMMF %%.. 8.3 5.8 3.3 07 08 10.5 8.8 4.3 ASXMMMMF %%.. 8.1 5.1 3.0 08 09 10.2 6.7 3.5 SMMMMMMF %... 7.8 3.8 2.4 09 10 8.5 1.5 0.0 MMMMMMMF%% .. 6.5 0.9 0.0 10 11 6.7 1.5 0.0 MMMMMM%%.. . 5.2 0.9 0.0 11 12 5.5 1.5 0.0 MMMMM%... 4.4 0.9 0.0 12 13 4.9 1.5 0.0 MMMMM%.. 4.1 0.9 0.0 13 14 4.5 1.5 0.0 MMMM%.. 3.8 0.9 0.0 14 15 4.3 1.5 0.0 MMMM%.. 3.7 0.9 0.0 15 16 4.3 1.5 0.0 MMMM%.. 3.6 0.9 0.0 16 17 4.2 1.5 0.0 MMMM%.. 3.6 0.9 0.0 17 18 4.0 1.5 0.0 MMMM%.. 3.5 0.9 0.0 18 19 4.0 1.5 0.0 MMMM%.. 3.4 0.9 0.0 19 20 3.8 1.5 0.0 MMMM%. 3.3 0.9 0.0 20 21 3.7 1.5 0.0 MMMM.. 3.2 0.9 0.0 21 22 3.8 1.5 0.0 MMMM.. 3.3 0.9 0.0 22 23 6.2 1.5 0.0 MMMMMF%. 4.9 0.9 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) 29-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000