SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 3 June, 2026 T-index: 80 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 49-52 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.5 7.1 3.6 AXMMMMF% %.. 7.0 4.1 2.5 00 01 11.2 8.9 4.3 ASXMMMMF F%%.. 8.2 5.2 3.0 01 02 11.9 9.8 4.8 SXMMMMM F%%%.. 8.8 5.8 3.2 02 03 12.1 10.4 5.0 SXXMMMM FF%%.. 9.0 6.1 3.4 03 04 11.8 10.7 5.1 ASXMMMM F%%... 8.9 6.3 3.5 04 05 11.5 10.6 5.1 ASXMMMM F%%.. 8.9 6.2 3.5 05 06 11.5 10.3 4.9 SXMMMMM F%%... 8.8 6.0 3.4 06 07 11.6 9.6 4.7 SXMMMMM F%%... 8.9 5.6 3.2 07 08 11.5 8.4 4.2 ASMMMMMM F%%... 8.7 4.9 2.9 08 09 10.8 6.2 3.2 SMMMMMMF %%... 8.1 3.4 2.3 09 10 8.6 1.5 0.0 MMMMMMMF%% ... 6.4 0.9 0.0 10 11 6.4 1.5 0.0 MMMMMM%%.. 4.9 0.9 0.0 11 12 5.2 1.5 0.0 MMMMM%.. 4.2 0.9 0.0 12 13 4.7 1.5 0.0 MMMM%%.. 3.9 0.9 0.0 13 14 4.5 1.5 0.0 MMMM%.. 3.7 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%.. 3.7 0.9 0.0 16 17 4.3 1.5 0.0 MMMM%.. 3.7 0.9 0.0 17 18 4.2 1.5 0.0 MMMM%.. 3.6 0.9 0.0 18 19 4.2 1.5 0.0 MMMM%.. 3.6 0.9 0.0 19 20 4.2 1.5 0.0 MMMM%.. 3.5 0.9 0.0 20 21 3.9 1.5 0.0 MMMM%.. 3.3 0.9 0.0 21 22 4.0 1.5 0.0 MMMM%. 3.4 0.9 0.0 22 23 6.3 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) 3-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000