SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 12 July, 2025 T-index: 75 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 8.6 7.0 3.6 SXMMMF%% .. 6.4 4.1 2.4 00 01 10.1 8.8 4.3 ASXMMMFF %... 7.4 5.2 2.9 01 02 10.7 9.8 4.7 SXMMMMF %%... 7.9 5.7 3.2 02 03 10.8 10.4 4.9 SXXMMMB %%... 8.0 6.1 3.4 03 04 10.4 10.6 5.0 SXXMMMB %%.. 7.9 6.2 3.4 04 05 10.2 10.6 5.0 SXXMMMB %%.. 7.9 6.2 3.4 05 06 10.1 10.2 4.9 SXMMMMB %... 7.9 6.0 3.3 06 07 10.1 9.6 4.6 SXMMMMF %... 7.8 5.6 3.2 07 08 10.2 8.4 4.1 ASMMMMMF %%.. 7.7 4.8 2.9 08 09 9.8 6.1 3.2 SMMMMMF% %.. 7.4 3.4 2.3 09 10 7.6 1.5 0.0 MMMMMMM%%. .. 5.8 0.9 0.0 10 11 5.8 1.5 0.0 MMMMM%%... 4.5 0.9 0.0 11 12 4.7 1.5 0.0 MMMM%%.. 3.9 0.9 0.0 12 13 4.3 1.5 0.0 MMMM%.. 3.6 0.9 0.0 13 14 4.0 1.5 0.0 MMMM%.. 3.4 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%.. 3.4 0.9 0.0 16 17 3.9 1.5 0.0 MMMM%. 3.4 0.9 0.0 17 18 3.9 1.5 0.0 MMMM%. 3.3 0.9 0.0 18 19 3.8 1.5 0.0 MMMM%. 3.2 0.9 0.0 19 20 3.8 1.5 0.0 MMMM%. 3.2 0.9 0.0 20 21 3.6 1.5 0.0 MMMM.. 3.1 0.9 0.0 21 22 3.7 1.5 0.0 MMM%. 3.2 0.9 0.0 22 23 5.6 1.5 0.0 MMMMM%. 4.5 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) 12-Jul-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000