SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 23 April, 2026 T-index: 58 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 37-41 1E 15 1 5 10 15 20 25 30 35 40 2F 57-61 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.2 6.5 3.2 AMMMMM%. . 6.8 3.9 2.6 00 01 9.0 7.5 3.6 AXMMMMM% .. 7.5 4.6 2.9 01 02 9.2 8.2 3.9 XMMMMM% %.. 7.8 5.0 3.1 02 03 9.4 8.5 4.0 XXMMMM% %.. 8.0 5.2 3.2 03 04 9.5 8.6 4.1 SXMMMM% %.. 8.1 5.3 3.3 04 05 9.6 8.5 4.0 XXMMMMM %.. 8.2 5.2 3.2 05 06 9.5 8.2 3.9 XMMMMMM %.. 8.2 5.0 3.1 06 07 9.5 7.7 3.7 AXMMMMMM %.. 8.1 4.6 3.0 07 08 9.2 6.7 3.3 AMMMMMM% %.. 7.8 4.0 2.7 08 09 8.5 4.9 2.5 MMMMMM%% .. 7.2 2.8 2.1 09 10 6.7 1.1 0.0 MMMMMMM%.. 5.7 0.7 0.0 10 11 5.1 1.1 0.0 MMMMMM.. 4.4 0.7 0.0 11 12 4.5 1.1 0.0 MMMMM%. 4.0 0.7 0.0 12 13 4.1 1.1 0.0 MMMMM.. 3.8 0.7 0.0 13 14 4.0 1.1 0.0 MMMM%. 3.7 0.7 0.0 14 15 4.0 1.1 0.0 MMMM%. 3.7 0.7 0.0 15 16 4.0 1.1 0.0 MMMM%. 3.7 0.7 0.0 16 17 4.0 1.1 0.0 MMMM%. 3.7 0.7 0.0 17 18 3.9 1.1 0.0 MMMM%. 3.6 0.7 0.0 18 19 3.9 1.1 0.0 MMMM%. 3.6 0.7 0.0 19 20 3.8 1.1 0.0 MMMM.. 3.5 0.7 0.0 20 21 3.5 1.1 0.0 MMMM. 3.2 0.7 0.0 21 22 3.7 1.1 0.0 MMMM. 3.4 0.7 0.0 22 23 6.3 4.4 2.3 AMMMM%.. 5.2 2.5 2.0 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) 23-Apr-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000