SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 12 April, 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 38-42 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 8.7 6.9 3.4 AXMMMM%% .. 7.3 4.2 2.8 00 01 9.4 7.9 3.8 XMMMMM% %.. 8.0 4.8 3.1 01 02 9.7 8.5 4.1 SXMMMMM %.. 8.3 5.2 3.3 02 03 10.1 8.8 4.2 SXMMMMM %%.. 8.7 5.4 3.4 03 04 10.4 8.9 4.3 SXMMMMM %%.. 9.0 5.5 3.4 04 05 10.5 8.8 4.2 SXMMMMM %%... 9.1 5.4 3.4 05 06 10.1 8.5 4.1 SXMMMMM %%.. 8.7 5.2 3.3 06 07 9.7 8.0 3.9 XMMMMMM %%.. 8.4 4.8 3.1 07 08 9.4 7.1 3.5 AXMMMMMM %%. 8.1 4.3 2.9 08 09 9.0 5.5 2.8 XMMMMMM% %.. 7.6 3.2 2.3 09 10 7.5 1.2 0.0 MMMMMMMM%% .. 6.3 0.7 0.0 10 11 5.8 1.2 0.0 MMMMMMM%.. 5.1 0.7 0.0 11 12 5.2 1.2 0.0 MMMMMM%.. 4.6 0.7 0.0 12 13 4.7 1.2 0.0 MMMMM%.. 4.3 0.7 0.0 13 14 4.5 1.2 0.0 MMMMM%. 4.1 0.7 0.0 14 15 4.5 1.2 0.0 MMMMM.. 4.1 0.7 0.0 15 16 4.5 1.2 0.0 MMMMM.. 4.1 0.7 0.0 16 17 4.4 1.2 0.0 MMMMM.. 4.0 0.7 0.0 17 18 4.3 1.2 0.0 MMMMM.. 3.9 0.7 0.0 18 19 4.2 1.2 0.0 MMMMM. 3.8 0.7 0.0 19 20 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 20 21 3.7 1.2 0.0 MMMM.. 3.4 0.7 0.0 21 22 4.1 1.2 0.0 MMMM%. 3.7 0.7 0.0 22 23 6.9 5.1 2.7 MMMM%%. 5.7 3.0 2.2 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) 12-Apr-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000