SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kalgoorlie Perth Date: 15 May, 2025 T-index: 80 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 60-63 2E 32 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.5 5.8 3.0 AMMMMM%. . 7.0 3.3 2.5 00 01 9.6 6.9 3.4 AMMMMMM% %.. 8.1 3.9 2.9 01 02 10.3 7.5 3.7 XMMMMMM %%.. 8.7 4.3 3.1 02 03 10.4 7.9 3.8 XMMMMMM %%.. 8.9 4.6 3.2 03 04 10.1 8.0 3.9 XMMMMMM %.. 8.7 4.6 3.2 04 05 10.0 7.9 3.9 XMMMMMM %.. 8.7 4.6 3.2 05 06 10.2 7.6 3.7 XMMMMMM %... 8.8 4.4 3.1 06 07 10.3 7.0 3.5 AMMMMMMM %%.. 8.9 4.0 2.9 07 08 10.0 6.0 3.1 AMMMMMMM %.. 8.5 3.4 2.6 08 09 9.1 3.9 2.1 AMMMMMMM% .. 7.7 2.0 1.9 09 10 7.1 1.1 0.0 MMMMMMM%.. 6.1 0.6 0.0 10 11 5.5 1.1 0.0 MMMMMM... 4.8 0.6 0.0 11 12 4.6 1.1 0.0 MMMMM.. 4.2 0.6 0.0 12 13 4.1 1.1 0.0 MMMM%.. 3.8 0.6 0.0 13 14 4.0 1.1 0.0 MMMM%. 3.7 0.6 0.0 14 15 3.9 1.1 0.0 MMMM%. 3.7 0.6 0.0 15 16 3.9 1.1 0.0 MMMM%. 3.6 0.6 0.0 16 17 3.9 1.1 0.0 MMMM%. 3.6 0.6 0.0 17 18 3.8 1.1 0.0 MMMM.. 3.5 0.6 0.0 18 19 3.8 1.1 0.0 MMMM%. 3.5 0.6 0.0 19 20 3.7 1.1 0.0 MMMM.. 3.5 0.6 0.0 20 21 3.3 1.1 0.0 MMMM.. 3.2 0.6 0.0 21 22 3.6 1.1 0.0 MMMM. 3.3 0.6 0.0 22 23 6.2 2.9 1.7 AMMMM%. 5.2 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) 15-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000