SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 30 July, 2026 T-index: 90 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 38-42 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 8.0 6.3 3.2 AMMMM%%. 6.7 3.8 2.6 00 01 9.1 7.5 3.7 AXMMMMF% .. 7.6 4.6 3.0 01 02 9.5 8.2 4.0 XMMMMM% %. 8.1 5.0 3.2 02 03 9.8 8.6 4.1 SXMMMM% %.. 8.3 5.3 3.3 03 04 9.8 8.7 4.2 SXMMMM% %.. 8.4 5.3 3.4 04 05 9.7 8.6 4.1 SXMMMM% %.. 8.4 5.3 3.3 05 06 9.7 8.3 4.0 XMMMMM% %.. 8.4 5.0 3.2 06 07 9.6 7.6 3.7 AXMMMMM% %.. 8.3 4.6 3.0 07 08 9.5 6.5 3.3 AMMMMMM% %.. 8.1 3.9 2.7 08 09 8.6 4.0 2.2 AMMMMMM%% . 7.2 2.0 1.9 09 10 7.1 1.2 0.0 MMMMMMM%.. 6.1 0.7 0.0 10 11 5.5 1.2 0.0 MMMMMM.. 4.8 0.7 0.0 11 12 4.6 1.2 0.0 MMMMM.. 4.2 0.7 0.0 12 13 4.2 1.2 0.0 MMMM%. 3.9 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.. 3.5 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 3.4 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 3.4 1.2 0.0 MMMM. 3.2 0.7 0.0 22 23 5.8 2.9 1.7 AMMM%. 4.9 0.0 1.6 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) 30-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000