SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 20 August, 2026 T-index: 70 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 38-43 1E 15 1 5 10 15 20 25 30 35 40 2F 58-62 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.7 6.6 3.3 AMMMM%%. 6.5 4.0 2.7 00 01 8.4 7.7 3.7 AXMMMM%. . 7.1 4.7 3.0 01 02 8.6 8.3 4.0 XXMMM%% .. 7.4 5.1 3.2 02 03 8.8 8.6 4.1 SXMMMM% .. 7.6 5.3 3.3 03 04 8.8 8.8 4.2 SXMMMM% .. 7.7 5.4 3.3 04 05 8.8 8.7 4.1 SXMMMM% .. 7.7 5.3 3.3 05 06 8.8 8.3 4.0 XXMMMM% .. 7.7 5.1 3.2 06 07 8.7 7.8 3.8 AXMMMMM% .. 7.5 4.7 3.0 07 08 8.6 6.8 3.4 AXMMMM%% .. 7.3 4.1 2.7 08 09 7.9 5.0 2.6 MMMMMM%. . 6.7 2.8 2.2 09 10 6.7 1.2 0.0 MMMMMMM%.. 5.8 0.7 0.0 10 11 5.3 1.2 0.0 MMMMMM... 4.7 0.7 0.0 11 12 4.5 1.2 0.0 MMMMM.. 4.0 0.7 0.0 12 13 4.2 1.2 0.0 MMMMM.. 3.8 0.7 0.0 13 14 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 14 15 3.8 1.2 0.0 MMMM.. 3.5 0.7 0.0 15 16 3.7 1.2 0.0 MMMM.. 3.5 0.7 0.0 16 17 3.7 1.2 0.0 MMMM.. 3.4 0.7 0.0 17 18 3.6 1.2 0.0 MMMM.. 3.3 0.7 0.0 18 19 3.5 1.2 0.0 MMMM.. 3.2 0.7 0.0 19 20 3.3 1.2 0.0 MMMM. 3.1 0.7 0.0 20 21 3.2 1.2 0.0 MMMM. 3.0 0.7 0.0 21 22 3.5 1.2 0.0 MMMM. 3.2 0.7 0.0 22 23 6.0 4.5 2.4 AMMMM%. 5.1 2.5 2.0 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) 20-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000