SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 16 April, 2026 T-index: 70 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 58-61 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.7 6.8 3.4 AXMMMM%% .. 7.2 4.1 2.7 00 01 9.4 7.8 3.8 AXMMMMM% %.. 7.9 4.7 3.0 01 02 9.6 8.4 4.0 XXMMMMM %.. 8.2 5.1 3.2 02 03 10.1 8.7 4.2 SXMMMMM %%.. 8.6 5.3 3.3 03 04 10.4 8.8 4.2 SXMMMMM %%.. 8.9 5.4 3.4 04 05 10.5 8.8 4.2 SXMMMMM %%.. 9.0 5.3 3.4 05 06 10.0 8.5 4.0 XXMMMMM %%.. 8.6 5.1 3.3 06 07 9.7 7.9 3.8 XMMMMMM %%.. 8.3 4.8 3.1 07 08 9.4 7.0 3.4 AXMMMMMM %%. 8.0 4.2 2.8 08 09 8.9 5.3 2.7 XMMMMMM% %.. 7.5 3.1 2.3 09 10 7.3 1.2 0.0 MMMMMMMM%. . 6.2 0.7 0.0 10 11 5.6 1.2 0.0 MMMMMM%.. 4.8 0.7 0.0 11 12 5.0 1.2 0.0 MMMMMM%. 4.4 0.7 0.0 12 13 4.5 1.2 0.0 MMMMM%.. 4.1 0.7 0.0 13 14 4.4 1.2 0.0 MMMMM.. 4.0 0.7 0.0 14 15 4.4 1.2 0.0 MMMMM.. 4.0 0.7 0.0 15 16 4.3 1.2 0.0 MMMMM.. 4.0 0.7 0.0 16 17 4.3 1.2 0.0 MMMMM.. 3.9 0.7 0.0 17 18 4.2 1.2 0.0 MMMMM.. 3.8 0.7 0.0 18 19 4.1 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 3.6 1.2 0.0 MMMM.. 3.4 0.7 0.0 21 22 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 22 23 6.8 4.9 2.6 MMMM%%. 5.6 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) 16-Apr-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000