SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 21 June, 2026 T-index: 75 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 49-52 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.8 6.9 3.5 SMMMMF%% .. 6.5 4.0 2.4 00 01 10.5 8.7 4.3 ASXMMMMF %%.. 7.7 5.1 2.9 01 02 11.2 9.7 4.7 SXMMMMF F%%.. 8.2 5.7 3.2 02 03 11.2 10.3 4.9 SXMMMMB F%%.. 8.3 6.0 3.3 03 04 10.9 10.5 5.0 SXXMMMB %%... 8.2 6.2 3.4 04 05 10.8 10.5 5.0 SXXMMMB %%... 8.2 6.1 3.4 05 06 10.8 10.1 4.8 SXMMMMB %%... 8.2 5.9 3.3 06 07 10.9 9.5 4.6 SXMMMMF %%... 8.3 5.5 3.1 07 08 10.8 8.3 4.1 ASMMMMMF %%... 8.2 4.8 2.8 08 09 10.1 5.9 3.1 SMMMMMFF %... 7.6 3.2 2.2 09 10 7.8 1.5 0.0 MMMMMMM%%. .. 5.8 0.9 0.0 10 11 5.7 1.5 0.0 MMMMM%%... 4.4 0.9 0.0 11 12 4.7 1.5 0.0 MMMM%%.. 3.8 0.9 0.0 12 13 4.3 1.5 0.0 MMMM%.. 3.6 0.9 0.0 13 14 4.1 1.5 0.0 MMMM%.. 3.5 0.9 0.0 14 15 4.0 1.5 0.0 MMMM%.. 3.4 0.9 0.0 15 16 4.0 1.5 0.0 MMMM%.. 3.5 0.9 0.0 16 17 4.1 1.5 0.0 MMMM%.. 3.5 0.9 0.0 17 18 4.1 1.5 0.0 MMMM%.. 3.5 0.9 0.0 18 19 4.0 1.5 0.0 MMMM%.. 3.4 0.9 0.0 19 20 4.1 1.5 0.0 MMMM%.. 3.4 0.9 0.0 20 21 3.9 1.5 0.0 MMMM%.. 3.2 0.9 0.0 21 22 3.8 1.5 0.0 MMMM.. 3.3 0.9 0.0 22 23 5.8 1.5 0.0 MMMMM%.. 4.6 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) 21-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000