SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 1 October, 2026 T-index: 60 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 38-46 1E 15 1 5 10 15 20 25 30 35 40 2F 58-64 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.1 7.4 3.6 AXMMM%.. 6.2 4.5 2.9 00 01 7.5 8.2 3.9 XMMMM%. 6.6 5.0 3.2 01 02 7.8 8.7 4.2 SXMMM%. . 6.9 5.3 3.3 02 03 8.1 9.0 4.3 SXMMMP. . 7.2 5.5 3.4 03 04 8.4 9.1 4.3 AXMMMM% .. 7.4 5.6 3.5 04 05 8.5 9.0 4.3 SXMMMM% .. 7.5 5.5 3.4 05 06 8.1 8.7 4.2 SXMMM%% . 7.1 5.3 3.4 06 07 7.7 8.3 4.0 XMMMM%. . 6.8 5.0 3.2 07 08 7.5 7.5 3.7 AXMMMM%. . 6.6 4.5 3.0 08 09 7.3 6.3 3.2 AMMMMM%. 6.4 3.8 2.6 09 10 6.7 3.8 2.1 AMMMMM%.. 5.9 1.9 1.8 10 11 5.7 1.1 0.0 MMMMMM%... 5.1 0.7 0.0 11 12 5.1 1.1 0.0 MMMMMM%.. 4.5 0.7 0.0 12 13 4.6 1.1 0.0 MMMMM%.. 4.1 0.7 0.0 13 14 4.4 1.1 0.0 MMMMM.. 4.0 0.7 0.0 14 15 4.4 1.1 0.0 MMMMM.. 4.0 0.7 0.0 15 16 4.2 1.1 0.0 MMMMM. 3.8 0.7 0.0 16 17 4.1 1.1 0.0 MMMM%. 3.7 0.7 0.0 17 18 3.9 1.1 0.0 MMMM%. 3.6 0.7 0.0 18 19 3.8 1.1 0.0 MMMM.. 3.5 0.7 0.0 19 20 3.5 1.1 0.0 MMMM. 3.3 0.7 0.0 20 21 3.6 1.1 0.0 MMMM.. 3.3 0.7 0.0 21 22 4.7 2.6 1.5 AMMM%. 4.2 0.0 1.5 22 23 6.4 6.1 3.1 AMMM%.. 5.5 3.6 2.5 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) 1-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000