SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 13 August, 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 37-42 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 6.4 3.2 AMMMM%.. 6.1 3.8 2.6 00 01 8.0 7.5 3.6 AXMMM%%. . 6.7 4.5 2.9 01 02 8.2 8.1 3.8 XMMMM%. . 7.0 4.9 3.1 02 03 8.4 8.4 4.0 XXMMM%. . 7.2 5.2 3.2 03 04 8.4 8.6 4.0 XXMMM%% .. 7.2 5.2 3.2 04 05 8.4 8.5 4.0 XXMMM%% .. 7.3 5.2 3.2 05 06 8.5 8.2 3.9 XMMMM%% .. 7.3 5.0 3.1 06 07 8.5 7.6 3.6 AXMMMM%. . 7.3 4.6 2.9 07 08 8.3 6.6 3.2 AMMMMM%. . 7.1 3.9 2.6 08 09 7.6 4.6 2.4 AMMMMM%.. 6.4 2.6 2.0 09 10 6.3 1.1 0.0 MMMMMM%.. 5.4 0.7 0.0 10 11 4.9 1.1 0.0 MMMMM%.. 4.3 0.7 0.0 11 12 4.1 1.1 0.0 MMMM%.. 3.7 0.7 0.0 12 13 3.9 1.1 0.0 MMMM%. 3.6 0.7 0.0 13 14 3.7 1.1 0.0 MMMM.. 3.4 0.7 0.0 14 15 3.6 1.1 0.0 MMMM.. 3.3 0.7 0.0 15 16 3.6 1.1 0.0 MMMM.. 3.3 0.7 0.0 16 17 3.5 1.1 0.0 MMMM.. 3.3 0.7 0.0 17 18 3.4 1.1 0.0 MMMM.. 3.2 0.7 0.0 18 19 3.3 1.1 0.0 MMMM.. 3.1 0.7 0.0 19 20 3.2 1.1 0.0 MMMM. 3.0 0.7 0.0 20 21 3.1 1.1 0.0 MMM%. 2.9 0.7 0.0 21 22 3.2 1.1 0.0 MMM%. 3.0 0.7 0.0 22 23 5.5 4.0 2.1 AMMM%. 4.7 2.2 1.8 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) 13-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000