SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 12 July, 2025 T-index: 75 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 37-41 1E 15 1 5 10 15 20 25 30 35 40 2F 57-61 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.3 5.8 2.9 XMMMM%.. 6.1 3.5 2.4 00 01 8.5 7.2 3.5 AXMMMM%. . 7.0 4.3 2.8 01 02 8.9 7.9 3.8 AXMMMM%% .. 7.4 4.8 3.0 02 03 9.0 8.3 3.9 XXMMM%% .. 7.6 5.1 3.1 03 04 9.0 8.4 4.0 XXMMMM% .. 7.6 5.1 3.2 04 05 9.0 8.3 3.9 XXMMMM% .. 7.7 5.1 3.2 05 06 9.0 8.0 3.8 XMMMMM% .. 7.7 4.8 3.1 06 07 9.0 7.3 3.5 AXMMMMM% .. 7.7 4.4 2.9 07 08 8.9 6.1 3.0 AMMMMM%% .. 7.5 3.6 2.5 08 09 7.9 2.6 1.5 MMMMMM%%. . 6.6 0.0 1.6 09 10 6.0 1.2 0.0 MMMMMM%.. 5.1 0.7 0.0 10 11 4.5 1.2 0.0 MMMMM.. 4.0 0.7 0.0 11 12 3.9 1.2 0.0 MMMM%.. 3.6 0.7 0.0 12 13 3.6 1.2 0.0 MMMM.. 3.3 0.7 0.0 13 14 3.4 1.2 0.0 MMMM. 3.2 0.7 0.0 14 15 3.4 1.2 0.0 MMMM. 3.2 0.7 0.0 15 16 3.4 1.2 0.0 MMMM. 3.2 0.7 0.0 16 17 3.4 1.2 0.0 MMMM. 3.2 0.7 0.0 17 18 3.4 1.2 0.0 MMMM.. 3.2 0.7 0.0 18 19 3.4 1.2 0.0 MMMM.. 3.2 0.7 0.0 19 20 3.4 1.2 0.0 MMMM.. 3.2 0.7 0.0 20 21 3.2 1.2 0.0 MMMM. 3.0 0.7 0.0 21 22 3.3 1.2 0.0 MMM%. 3.1 0.7 0.0 22 23 5.0 1.2 0.0 MMMMM.. 4.4 0.7 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