SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 5 May, 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 29-33 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 10.2 7.7 3.9 AXMMMMMF %%.. 7.6 4.5 2.6 00 01 11.7 9.3 4.5 SXMMMMM F%%%.. 8.7 5.4 3.1 01 02 12.3 10.2 4.9 SXMMMMM MF%%... 9.2 6.0 3.3 02 03 12.6 10.7 5.1 ASXMMMM MF%%... 9.5 6.3 3.5 03 04 12.4 11.0 5.2 ASXMMMM MF%%... 9.5 6.4 3.6 04 05 12.2 10.9 5.2 ASXMMMM MF%%... 9.5 6.4 3.6 05 06 12.1 10.6 5.1 ASXMMMM MF%%.. 9.5 6.2 3.5 06 07 12.1 10.0 4.8 SXMMMMM MF%%... 9.4 5.8 3.3 07 08 12.0 8.9 4.4 ASXMMMMM M%%%... 9.1 5.2 3.0 08 09 11.4 7.0 3.6 AMMMMMMM F%%... 8.6 4.0 2.5 09 10 9.4 1.5 0.0 MMMMMMMMF% %... 7.1 0.9 0.0 10 11 7.3 1.5 0.0 MMMMMMM%%. .. 5.6 0.9 0.0 11 12 6.0 1.5 0.0 MMMMMM%... 4.8 0.9 0.0 12 13 5.3 1.5 0.0 MMMMM%%.. 4.3 0.9 0.0 13 14 5.0 1.5 0.0 MMMMM%.. 4.2 0.9 0.0 14 15 4.9 1.5 0.0 MMMMM%.. 4.1 0.9 0.0 15 16 4.8 1.5 0.0 MMMMM%.. 4.0 0.9 0.0 16 17 4.7 1.5 0.0 MMMMM%.. 4.0 0.9 0.0 17 18 4.6 1.5 0.0 MMMMM%. 3.9 0.9 0.0 18 19 4.5 1.5 0.0 MMMMM.. 3.8 0.9 0.0 19 20 4.4 1.5 0.0 MMMM%.. 3.7 0.9 0.0 20 21 4.0 1.5 0.0 MMMM%.. 3.4 0.9 0.0 21 22 4.2 1.5 0.0 MMMM%. 3.6 0.9 0.0 22 23 7.1 2.9 1.7 MMMMMF%. 5.5 1.6 1.2 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) 5-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000