SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 31 May, 2026 T-index: 92 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 49-53 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 10.0 7.2 3.7 AXMMMMF% %.. 7.4 4.2 2.5 00 01 12.0 9.0 4.5 ASXMMMMM F%%... 8.7 5.3 3.0 01 02 12.7 10.0 4.9 SXMMMMM FF%%... 9.3 5.9 3.3 02 03 12.8 10.6 5.1 ASXMMMM MF%%... 9.6 6.2 3.5 03 04 12.4 10.8 5.2 ASXMMMM FF%%.. 9.5 6.3 3.5 04 05 12.2 10.8 5.2 ASXMMMM FF%%.. 9.4 6.3 3.5 05 06 12.1 10.4 5.0 AXXMMMM FF%%.. 9.4 6.1 3.5 06 07 12.3 9.8 4.8 SXMMMMM MF%%.. 9.5 5.7 3.3 07 08 12.2 8.6 4.3 ASMMMMMM FF%%.. 9.3 5.0 3.0 08 09 11.5 6.3 3.3 SMMMMMMM F%%.. 8.7 3.5 2.3 09 10 9.3 1.6 0.0 MMMMMMMMF% %.. 7.0 0.9 0.0 10 11 7.1 1.6 0.0 MMMMMMF%.. . 5.5 0.9 0.0 11 12 5.7 1.6 0.0 MMMMM%%.. 4.6 0.9 0.0 12 13 5.1 1.6 0.0 MMMMM%.. 4.2 0.9 0.0 13 14 4.7 1.6 0.0 MMMM%.. 3.9 0.9 0.0 14 15 4.5 1.6 0.0 MMMM%.. 3.8 0.9 0.0 15 16 4.5 1.6 0.0 MMMM%.. 3.8 0.9 0.0 16 17 4.5 1.6 0.0 MMMM%.. 3.8 0.9 0.0 17 18 4.3 1.6 0.0 MMMM%.. 3.7 0.9 0.0 18 19 4.2 1.6 0.0 MMMM%.. 3.6 0.9 0.0 19 20 4.2 1.6 0.0 MMMM%.. 3.6 0.9 0.0 20 21 4.0 1.6 0.0 MMMM%.. 3.4 0.9 0.0 21 22 4.1 1.6 0.0 MMMM%. 3.5 0.9 0.0 22 23 6.6 1.6 0.0 MMMMMM%.. 5.2 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) 31-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000