SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 16 October, 2026 T-index: 60 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 38-47 1E 15 1 5 10 15 20 25 30 35 40 2F 58-66 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.9 7.6 3.7 AXMMM%. 6.1 4.6 3.0 00 01 7.2 8.3 4.0 XXMMP.. 6.4 5.1 3.2 01 02 7.6 8.8 4.2 SXMMM%. . 6.7 5.4 3.4 02 03 8.1 9.1 4.3 AXMMMP. . 7.1 5.6 3.5 03 04 8.4 9.2 4.4 AXMMMM% .. 7.4 5.6 3.5 04 05 8.6 9.1 4.3 AXMMMM% .. 7.5 5.6 3.5 05 06 8.3 8.8 4.2 SXMMMM% .. 7.2 5.4 3.4 06 07 7.8 8.4 4.1 SXMMM%. . 6.8 5.1 3.3 07 08 7.5 7.7 3.8 AXMMMM%. . 6.6 4.7 3.0 08 09 7.4 6.6 3.3 AMMMMM%. 6.5 4.0 2.7 09 10 6.9 4.7 2.5 MMMMMM%. . 6.1 2.7 2.1 10 11 6.0 1.1 0.0 MMMMMMM%.. 5.3 0.7 0.0 11 12 5.4 1.1 0.0 MMMMMM%.. 4.8 0.7 0.0 12 13 4.8 1.1 0.0 MMMMM%.. 4.3 0.7 0.0 13 14 4.6 1.1 0.0 MMMMM%. 4.2 0.7 0.0 14 15 4.6 1.1 0.0 MMMMM%. 4.2 0.7 0.0 15 16 4.4 1.1 0.0 MMMMM.. 4.0 0.7 0.0 16 17 4.3 1.1 0.0 MMMMM.. 3.9 0.7 0.0 17 18 4.1 1.1 0.0 MMMM%. 3.7 0.7 0.0 18 19 3.8 1.1 0.0 MMMM%. 3.6 0.7 0.0 19 20 3.7 1.1 0.0 MMMM.. 3.4 0.7 0.0 20 21 3.8 1.1 0.0 MMMM%. 3.5 0.7 0.0 21 22 5.3 4.1 2.2 AMMM%.. 4.7 2.2 1.9 22 23 6.4 6.4 3.2 AMMM%.. 5.6 3.8 2.6 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-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000