SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kalgoorlie Perth Date: 12 July, 2025 T-index: 75 Bearings: 254 77 Distance: 548 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 40-44 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 7.2 5.5 2.8 XMMMM%.. 6.0 3.1 2.4 00 01 8.2 6.7 3.3 AMMMMM%. . 6.9 3.8 2.8 01 02 8.7 7.3 3.6 AXMMMM%% .. 7.3 4.2 3.0 02 03 8.8 7.7 3.7 XMMMM%% .. 7.5 4.5 3.1 03 04 8.7 7.8 3.8 XMMMM%% .. 7.5 4.5 3.1 04 05 8.6 7.7 3.8 XMMMM%% .. 7.5 4.5 3.1 05 06 8.6 7.4 3.6 AXMMMM%% .. 7.5 4.3 3.0 06 07 8.6 6.8 3.4 AMMMMM%% .. 7.5 3.9 2.8 07 08 8.6 5.8 2.9 XMMMMM%% .. 7.3 3.3 2.4 08 09 7.8 3.1 1.7 AMMMMM%%. . 6.6 0.0 1.6 09 10 5.9 1.1 0.0 MMMMMM%.. 5.1 0.6 0.0 10 11 4.4 1.1 0.0 MMMMM.. 3.9 0.6 0.0 11 12 3.9 1.1 0.0 MMMM%. 3.6 0.6 0.0 12 13 3.6 1.1 0.0 MMMM.. 3.4 0.6 0.0 13 14 3.4 1.1 0.0 MMMM.. 3.2 0.6 0.0 14 15 3.4 1.1 0.0 MMMM. 3.2 0.6 0.0 15 16 3.4 1.1 0.0 MMMM. 3.2 0.6 0.0 16 17 3.4 1.1 0.0 MMMM.. 3.2 0.6 0.0 17 18 3.4 1.1 0.0 MMMM.. 3.2 0.6 0.0 18 19 3.4 1.1 0.0 MMMM.. 3.2 0.6 0.0 19 20 3.4 1.1 0.0 MMMM.. 3.2 0.6 0.0 20 21 3.2 1.1 0.0 MMMM. 3.0 0.6 0.0 21 22 3.2 1.1 0.0 MMM%. 3.0 0.6 0.0 22 23 5.1 1.1 0.0 MMMMM.. 4.3 0.0 1.2 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