SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 27 August, 2026 T-index: 75 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 7.9 6.8 3.4 AXMMM%%. . 6.7 4.1 2.7 00 01 8.5 7.8 3.8 XMMMM%% . 7.2 4.8 3.1 01 02 8.8 8.4 4.1 SXMMMM% .. 7.6 5.1 3.3 02 03 9.0 8.8 4.2 SXMMMM% .. 7.8 5.4 3.4 03 04 9.1 8.9 4.2 SXMMMM% .. 7.9 5.4 3.4 04 05 9.1 8.8 4.2 SXMMMM% ... 7.9 5.4 3.4 05 06 8.9 8.5 4.1 SXMMMM% .. 7.7 5.2 3.3 06 07 8.6 7.9 3.9 XMMMMM% .. 7.5 4.8 3.1 07 08 8.5 7.0 3.5 AXMMMM%% .. 7.3 4.2 2.8 08 09 8.0 5.3 2.8 XMMMMM%. . 6.8 3.1 2.3 09 10 7.0 1.2 0.0 MMMMMMM%.. . 6.0 0.7 0.0 10 11 5.6 1.2 0.0 MMMMMM%.. 4.9 0.7 0.0 11 12 4.8 1.2 0.0 MMMMM%.. 4.3 0.7 0.0 12 13 4.4 1.2 0.0 MMMMM.. 4.0 0.7 0.0 13 14 4.2 1.2 0.0 MMMMM.. 3.8 0.7 0.0 14 15 4.1 1.2 0.0 MMMM%. 3.7 0.7 0.0 15 16 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 16 17 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 17 18 3.7 1.2 0.0 MMMM.. 3.5 0.7 0.0 18 19 3.6 1.2 0.0 MMMM.. 3.3 0.7 0.0 19 20 3.4 1.2 0.0 MMMM.. 3.2 0.7 0.0 20 21 3.3 1.2 0.0 MMMM. 3.1 0.7 0.0 21 22 3.8 1.2 0.0 MMMM.. 3.5 0.7 0.0 22 23 6.3 4.9 2.6 MMMM%. 5.3 2.8 2.1 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) 27-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000