SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 3 May, 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 29-33 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 10.6 7.8 3.9 AXMMMMMF %%.. 7.9 4.6 2.7 00 01 12.1 9.4 4.6 SXMMMMM FF%%.. 9.0 5.5 3.1 01 02 12.7 10.3 5.0 SXMMMMM MF%%%.. 9.5 6.0 3.4 02 03 12.8 10.8 5.2 ASXMMMM MF%%%.. 9.7 6.3 3.5 03 04 12.6 11.0 5.3 ASXMMMM MF%%... 9.7 6.5 3.6 04 05 12.5 11.0 5.3 ASXMMMM MF%%... 9.7 6.5 3.6 05 06 12.4 10.7 5.1 ASXMMMM MF%%... 9.7 6.3 3.5 06 07 12.3 10.0 4.9 SXMMMMM MF%%... 9.6 5.9 3.3 07 08 12.2 9.0 4.4 SXMMMMM MF%%... 9.3 5.2 3.1 08 09 11.6 7.1 3.6 AMMMMMMM F%%%.. 8.8 4.0 2.5 09 10 9.7 1.5 0.0 MMMMMMMMM% %%.. 7.3 0.9 0.0 10 11 7.7 1.5 0.0 MMMMMMM%%. .. 5.9 0.9 0.0 11 12 6.4 1.5 0.0 MMMMMM%%.. 5.1 0.9 0.0 12 13 5.6 1.5 0.0 MMMMM%%.. 4.5 0.9 0.0 13 14 5.3 1.5 0.0 MMMMM%.. 4.4 0.9 0.0 14 15 5.1 1.5 0.0 MMMMM%.. 4.3 0.9 0.0 15 16 5.0 1.5 0.0 MMMMM%.. 4.2 0.9 0.0 16 17 4.9 1.5 0.0 MMMMM%.. 4.2 0.9 0.0 17 18 4.7 1.5 0.0 MMMMM%.. 4.0 0.9 0.0 18 19 4.5 1.5 0.0 MMMMM%. 3.9 0.9 0.0 19 20 4.4 1.5 0.0 MMMM%.. 3.8 0.9 0.0 20 21 4.0 1.5 0.0 MMMM%.. 3.5 0.9 0.0 21 22 4.3 1.5 0.0 MMMM%. 3.7 0.9 0.0 22 23 7.3 3.3 1.9 MMMMMF%.. 5.7 1.9 1.3 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-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000