SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 7 May, 2026 T-index: 65 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 6.3 3.1 AMMMMM%. . 6.8 3.8 2.5 00 01 9.2 7.4 3.6 AXMMMMM% .. 7.7 4.5 2.9 01 02 9.7 8.0 3.8 XMMMMM% %.. 8.2 4.9 3.1 02 03 9.8 8.4 4.0 XXMMMM% %.. 8.3 5.2 3.2 03 04 9.6 8.5 4.0 XXMMMM% %.. 8.2 5.2 3.2 04 05 9.6 8.4 4.0 XXMMMM% %.. 8.3 5.1 3.2 05 06 9.7 8.1 3.9 XMMMMMM %.. 8.4 4.9 3.1 06 07 9.8 7.5 3.6 AXMMMMMM %... 8.4 4.5 2.9 07 08 9.5 6.5 3.2 AMMMMMM% %.. 8.0 3.9 2.6 08 09 8.6 4.3 2.3 AMMMMMM%% .. 7.2 2.3 2.0 09 10 6.7 1.2 0.0 MMMMMMM%.. 5.7 0.7 0.0 10 11 5.0 1.2 0.0 MMMMM%.. 4.4 0.7 0.0 11 12 4.4 1.2 0.0 MMMMM.. 4.0 0.7 0.0 12 13 3.9 1.2 0.0 MMMM%.. 3.6 0.7 0.0 13 14 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 14 15 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 15 16 3.9 1.2 0.0 MMMM%. 3.6 0.7 0.0 16 17 3.8 1.2 0.0 MMMM.. 3.5 0.7 0.0 17 18 3.8 1.2 0.0 MMMM.. 3.5 0.7 0.0 18 19 3.8 1.2 0.0 MMMM%. 3.5 0.7 0.0 19 20 3.7 1.2 0.0 MMMM.. 3.4 0.7 0.0 20 21 3.4 1.2 0.0 MMMM.. 3.1 0.7 0.0 21 22 3.6 1.2 0.0 MMMM. 3.3 0.7 0.0 22 23 6.1 3.5 1.9 AMMMM%. 5.1 1.7 1.7 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) 7-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000