SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 27 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 29-32 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 9.7 7.2 3.7 AXMMMMF% %.. 7.1 4.2 2.5 00 01 11.4 8.9 4.4 ASXMMMMF F%%.. 8.4 5.2 3.0 01 02 12.1 9.9 4.8 SXMMMMM FF%%.. 8.9 5.8 3.3 02 03 12.3 10.5 5.0 SXXMMMM FF%%.. 9.2 6.1 3.4 03 04 11.9 10.7 5.1 ASXMMMM F%%... 9.1 6.3 3.5 04 05 11.7 10.7 5.1 ASXMMMM F%%... 9.0 6.3 3.5 05 06 11.6 10.3 5.0 SXMMMMM F%%... 9.0 6.0 3.4 06 07 11.8 9.7 4.7 SXMMMMM F%%... 9.1 5.6 3.2 07 08 11.8 8.5 4.2 ASMMMMMM F%%... 8.9 4.9 2.9 08 09 11.0 6.3 3.3 SMMMMMMF %%%.. 8.2 3.5 2.3 09 10 8.8 1.5 0.0 MMMMMMMM%% ... 6.6 0.9 0.0 10 11 6.6 1.5 0.0 MMMMMM%%.. . 5.1 0.9 0.0 11 12 5.4 1.5 0.0 MMMMM%... 4.3 0.9 0.0 12 13 4.8 1.5 0.0 MMMMM%.. 4.0 0.9 0.0 13 14 4.6 1.5 0.0 MMMM%.. 3.8 0.9 0.0 14 15 4.4 1.5 0.0 MMMM%.. 3.7 0.9 0.0 15 16 4.4 1.5 0.0 MMMM%.. 3.7 0.9 0.0 16 17 4.4 1.5 0.0 MMMM%.. 3.7 0.9 0.0 17 18 4.3 1.5 0.0 MMMM%.. 3.6 0.9 0.0 18 19 4.2 1.5 0.0 MMMM%.. 3.6 0.9 0.0 19 20 4.2 1.5 0.0 MMMM%.. 3.5 0.9 0.0 20 21 3.9 1.5 0.0 MMMM%.. 3.3 0.9 0.0 21 22 4.0 1.5 0.0 MMMM%. 3.4 0.9 0.0 22 23 6.5 1.5 0.0 MMMMMM%.. 5.1 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) 27-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000