SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 20 May, 2026 T-index: 55 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 48-52 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.0 7.1 3.6 SXMMMF%% .. 6.7 4.2 2.4 00 01 10.5 8.8 4.2 ASXMMMMF %%.. 7.6 5.1 2.9 01 02 10.9 9.7 4.6 SXMMMMF %%%.. 8.0 5.7 3.1 02 03 11.0 10.2 4.8 SXMMMMB %%%.. 8.2 6.0 3.3 03 04 10.8 10.5 4.9 SXXMMMB %%... 8.1 6.1 3.4 04 05 10.5 10.4 4.9 SXXMMMB %%... 8.0 6.1 3.3 05 06 10.6 10.1 4.8 SXMMMMB %%... 8.2 5.9 3.3 06 07 11.0 9.5 4.5 SXMMMMF %%... 8.4 5.5 3.1 07 08 10.9 8.4 4.1 ASMMMMMF %%... 8.2 4.8 2.8 08 09 10.1 6.3 3.2 SMMMMMFF %... 7.5 3.5 2.3 09 10 7.7 1.4 0.0 MMMMMMM%%. .. 5.8 0.8 0.0 10 11 5.8 1.4 0.0 MMMMM%%... 4.5 0.8 0.0 11 12 4.7 1.4 0.0 MMMM%%.. 3.8 0.8 0.0 12 13 4.4 1.4 0.0 MMMM%.. 3.6 0.8 0.0 13 14 4.2 1.4 0.0 MMMM%.. 3.5 0.8 0.0 14 15 4.2 1.4 0.0 MMMM%.. 3.6 0.8 0.0 15 16 4.3 1.4 0.0 MMMM%.. 3.6 0.8 0.0 16 17 4.3 1.4 0.0 MMMM%.. 3.6 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 6.3 1.4 0.0 MMMMMF%. 4.9 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) 20-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000