SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 28 June, 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 29-32 1E 10 1 5 10 15 20 25 30 35 40 2F 49-53 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.1 7.0 3.6 SMMMMFF% .. 6.7 4.0 2.4 00 01 10.9 8.8 4.3 ASXMMMMF %%.. 8.0 5.2 3.0 01 02 11.6 9.8 4.8 SXMMMMF F%%.. 8.5 5.8 3.2 02 03 11.6 10.4 5.0 SXXMMMM F%%.. 8.6 6.1 3.4 03 04 11.3 10.7 5.1 ASXMMMB F%%.. 8.6 6.2 3.5 04 05 11.1 10.6 5.1 ASXMMMB F%... 8.5 6.2 3.5 05 06 11.0 10.3 4.9 SXMMMMB %%... 8.5 6.0 3.4 06 07 11.1 9.6 4.7 SXMMMMF F%... 8.5 5.6 3.2 07 08 11.1 8.4 4.2 ASMMMMMF F%... 8.4 4.8 2.9 08 09 10.5 6.0 3.1 SMMMMMMF %%.. 7.9 3.3 2.2 09 10 8.3 1.5 0.0 MMMMMMMF%% .. 6.3 0.9 0.0 10 11 6.2 1.5 0.0 MMMMMM%... 4.8 0.9 0.0 11 12 5.0 1.5 0.0 MMMMM%.. 4.1 0.9 0.0 12 13 4.6 1.5 0.0 MMMM%.. 3.8 0.9 0.0 13 14 4.2 1.5 0.0 MMMM%.. 3.6 0.9 0.0 14 15 4.1 1.5 0.0 MMMM%. 3.5 0.9 0.0 15 16 4.1 1.5 0.0 MMMM%.. 3.5 0.9 0.0 16 17 4.1 1.5 0.0 MMMM%.. 3.5 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 4.0 1.5 0.0 MMMM%.. 3.4 0.9 0.0 20 21 3.8 1.5 0.0 MMMM%. 3.2 0.9 0.0 21 22 3.9 1.5 0.0 MMMM.. 3.3 0.9 0.0 22 23 5.9 1.5 0.0 MMMMM%.. 4.7 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) 28-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000