SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kalgoorlie Perth Date: 16 May, 2025 T-index: 90 Bearings: 254 77 Distance: 548 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 40-45 1E 17 1 5 10 15 20 25 30 35 40 2F 60-64 2E 32 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.9 5.9 3.0 AMMMMM%% .. 7.4 3.3 2.5 00 01 10.1 7.0 3.5 AMMMMMMF %.. 8.5 4.0 2.9 01 02 10.8 7.6 3.8 XMMMMMM %%.. 9.2 4.4 3.1 02 03 11.0 8.0 3.9 XMMMMMM %%.. 9.4 4.6 3.2 03 04 10.6 8.1 4.0 XMMMMMM %%.. 9.2 4.7 3.3 04 05 10.6 8.0 3.9 XMMMMMM %%.. 9.2 4.6 3.2 05 06 10.7 7.7 3.8 XMMMMMM %%.. 9.3 4.4 3.1 06 07 10.8 7.1 3.6 AXMMMMMM %%.. 9.3 4.1 2.9 07 08 10.5 6.1 3.1 AMMMMMMM %%.. 8.9 3.5 2.6 08 09 9.6 3.9 2.2 AMMMMMMM% %.. 8.2 2.0 1.9 09 10 7.6 1.1 0.0 MMMMMMM%%. . 6.5 0.6 0.0 10 11 5.9 1.1 0.0 MMMMMM%.. 5.2 0.6 0.0 11 12 5.0 1.1 0.0 MMMMM%.. 4.5 0.6 0.0 12 13 4.3 1.1 0.0 MMMMM.. 4.0 0.6 0.0 13 14 4.3 1.1 0.0 MMMM%.. 3.9 0.6 0.0 14 15 4.1 1.1 0.0 MMMM%. 3.8 0.6 0.0 15 16 4.1 1.1 0.0 MMMM%. 3.8 0.6 0.0 16 17 4.1 1.1 0.0 MMMM%. 3.7 0.6 0.0 17 18 3.9 1.1 0.0 MMMM%. 3.6 0.6 0.0 18 19 3.8 1.1 0.0 MMMM%. 3.5 0.6 0.0 19 20 3.8 1.1 0.0 MMMM%. 3.5 0.6 0.0 20 21 3.4 1.1 0.0 MMMM.. 3.2 0.6 0.0 21 22 3.7 1.1 0.0 MMMM. 3.4 0.6 0.0 22 23 6.5 2.9 1.7 AMMMM%. 5.4 0.0 1.6 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) 16-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000