SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 5 March, 2026 T-index: 110 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 38-48 1E 15 1 5 10 15 20 25 30 35 40 2F 58-66 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.0 7.9 4.0 XMMMM%. . 7.1 4.8 3.2 00 01 8.7 8.7 4.3 AXMMMM% .. 7.6 5.3 3.5 01 02 9.0 9.2 4.6 AXMMMM% .. 7.9 5.6 3.7 02 03 9.6 9.5 4.7 AXMMMMM %.. 8.4 5.8 3.8 03 04 9.8 9.6 4.7 AXMMMMM %.. 8.6 5.9 3.8 04 05 10.0 9.6 4.7 AXMMMMM %.. 8.8 5.9 3.8 05 06 9.9 9.3 4.6 AXMMMMM %.. 8.7 5.7 3.7 06 07 9.7 8.8 4.4 AXMMMMM %.. 8.5 5.4 3.5 07 08 9.5 8.0 4.1 SMMMMMM %.. 8.3 4.9 3.3 08 09 9.2 6.9 3.6 AXMMMMM% %. 8.0 4.1 2.9 09 10 8.8 4.5 2.5 MMMMMMM% .. 7.6 2.5 2.1 10 11 8.1 1.3 0.0 MMMMMMMM%% . 7.1 0.8 0.0 11 12 7.3 1.3 0.0 MMMMMMMM%. 6.5 0.8 0.0 12 13 6.7 1.3 0.0 MMMMMMM%. 6.0 0.8 0.0 13 14 6.1 1.3 0.0 MMMMMM%.. 5.5 0.8 0.0 14 15 5.8 1.3 0.0 MMMMMM%.. 5.3 0.8 0.0 15 16 5.7 1.3 0.0 MMMMMM%. 5.2 0.8 0.0 16 17 5.4 1.3 0.0 MMMMMM.. 4.9 0.8 0.0 17 18 5.1 1.3 0.0 MMMMM%. 4.6 0.8 0.0 18 19 4.7 1.3 0.0 MMMMM%. 4.3 0.8 0.0 19 20 4.4 1.3 0.0 MMMMM. 4.1 0.8 0.0 20 21 4.4 1.3 0.0 MMMMM. 4.0 0.8 0.0 21 22 5.3 3.8 2.2 AMMM%. 4.7 0.0 1.9 22 23 7.0 6.6 3.5 AMMMM%.. 6.1 4.0 2.8 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) 5-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000