SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 29 March, 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 38-45 1E 15 1 5 10 15 20 25 30 35 40 2F 58-64 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.8 7.3 3.7 AXMMMM%% .. 7.4 4.4 3.0 00 01 9.5 8.2 4.1 SMMMMM% %.. 8.1 5.0 3.3 01 02 9.8 8.8 4.3 SXMMMMM %.. 8.5 5.4 3.4 02 03 10.1 9.1 4.4 AXMMMMM %%. 8.8 5.6 3.5 03 04 10.4 9.2 4.5 AXMMMMM %%.. 9.0 5.7 3.6 04 05 10.6 9.2 4.4 AXMMMMM %%.. 9.2 5.6 3.6 05 06 10.3 8.9 4.3 AXMMMMM %%.. 9.0 5.4 3.5 06 07 10.0 8.3 4.1 SXMMMMM %%.. 8.7 5.1 3.3 07 08 9.7 7.5 3.7 AXMMMMMM %%. 8.4 4.5 3.0 08 09 9.4 6.1 3.1 AMMMMMMM %.. 8.1 3.6 2.6 09 10 8.2 1.2 0.0 MMMMMMMMM% .. 7.1 0.0 1.1 10 11 6.9 1.2 0.0 MMMMMMMM%. . 6.1 0.7 0.0 11 12 6.1 1.2 0.0 MMMMMMM%.. 5.4 0.7 0.0 12 13 5.5 1.2 0.0 MMMMMM%.. 4.9 0.7 0.0 13 14 5.2 1.2 0.0 MMMMMM.. 4.7 0.7 0.0 14 15 5.0 1.2 0.0 MMMMM%.. 4.6 0.7 0.0 15 16 4.9 1.2 0.0 MMMMM%.. 4.5 0.7 0.0 16 17 4.7 1.2 0.0 MMMMM%. 4.3 0.7 0.0 17 18 4.7 1.2 0.0 MMMMM%. 4.3 0.7 0.0 18 19 4.5 1.2 0.0 MMMMM.. 4.1 0.7 0.0 19 20 4.2 1.2 0.0 MMMM%. 3.8 0.7 0.0 20 21 4.0 1.2 0.0 MMMM%. 3.7 0.7 0.0 21 22 4.7 1.2 0.0 MMMMM. 4.2 0.7 0.0 22 23 7.2 5.8 3.0 AMMMM%.. 6.1 3.4 2.5 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) 29-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000