SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 17 May, 2026 T-index: 60 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 28-32 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 9.3 7.3 3.6 AXMMMMF% %.. 6.9 4.2 2.5 00 01 10.8 8.9 4.3 ASXMMMMF %%... 7.9 5.2 2.9 01 02 11.2 9.8 4.7 SXMMMMF F%%.. 8.3 5.8 3.2 02 03 11.4 10.3 4.9 SXXMMMM F%%... 8.5 6.1 3.3 03 04 11.1 10.6 5.0 SXXMMMM F%%.. 8.4 6.2 3.4 04 05 10.8 10.5 5.0 SXXMMMB %%... 8.3 6.2 3.4 05 06 10.9 10.2 4.8 SXMMMMM %%%.. 8.5 6.0 3.3 06 07 11.3 9.6 4.6 SXMMMMM F%%.. 8.7 5.6 3.1 07 08 11.3 8.5 4.1 ASMMMMMM F%%.. 8.5 4.9 2.9 08 09 10.4 6.5 3.3 SMMMMMMF %%.. 7.7 3.6 2.3 09 10 8.1 1.4 0.0 MMMMMMMF%% .. 6.1 0.8 0.0 10 11 6.1 1.4 0.0 MMMMMM%... 4.7 0.8 0.0 11 12 5.0 1.4 0.0 MMMMM%.. 4.0 0.8 0.0 12 13 4.5 1.4 0.0 MMMM%.. 3.7 0.8 0.0 13 14 4.3 1.4 0.0 MMMM%.. 3.6 0.8 0.0 14 15 4.3 1.4 0.0 MMMM%.. 3.7 0.8 0.0 15 16 4.4 1.4 0.0 MMMM%.. 3.7 0.8 0.0 16 17 4.4 1.4 0.0 MMMM%.. 3.7 0.8 0.0 17 18 4.2 1.4 0.0 MMMM%.. 3.6 0.8 0.0 18 19 4.1 1.4 0.0 MMMM%.. 3.5 0.8 0.0 19 20 4.1 1.4 0.0 MMMM%.. 3.4 0.8 0.0 20 21 3.8 1.4 0.0 MMMM%.. 3.2 0.8 0.0 21 22 3.9 1.4 0.0 MMMM.. 3.3 0.8 0.0 22 23 6.5 1.4 0.0 MMMMMF%.. 5.0 0.8 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) 17-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000