SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 17 September, 2026 T-index: 55 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 38-44 1E 15 1 5 10 15 20 25 30 35 40 2F 58-63 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.2 7.1 3.5 AXMMM%.. 6.2 4.3 2.8 00 01 7.6 7.9 3.8 XMMM%%. 6.5 4.8 3.1 01 02 7.7 8.5 4.0 XXMMM%. . 6.8 5.2 3.2 02 03 8.0 8.8 4.2 SXMMM%. . 7.0 5.4 3.3 03 04 8.2 8.9 4.2 SXMMM%% . 7.2 5.4 3.4 04 05 8.3 8.8 4.2 SXMMM%% .. 7.2 5.4 3.4 05 06 7.9 8.5 4.1 SXMMM%. . 6.9 5.2 3.3 06 07 7.5 8.0 3.9 XMMMM%. . 6.6 4.9 3.1 07 08 7.4 7.2 3.5 AXMMMM%. 6.4 4.4 2.9 08 09 7.1 5.9 3.0 AMMMM%%. 6.1 3.5 2.5 09 10 6.3 1.1 0.0 MMMMMMM%.. 5.5 0.0 1.3 10 11 5.3 1.1 0.0 MMMMMM%.. 4.7 0.7 0.0 11 12 4.6 1.1 0.0 MMMMM%.. 4.2 0.7 0.0 12 13 4.2 1.1 0.0 MMMMM.. 3.8 0.7 0.0 13 14 4.1 1.1 0.0 MMMMM.. 3.8 0.7 0.0 14 15 4.1 1.1 0.0 MMMM%. 3.7 0.7 0.0 15 16 3.9 1.1 0.0 MMMM%. 3.6 0.7 0.0 16 17 3.8 1.1 0.0 MMMM%. 3.5 0.7 0.0 17 18 3.7 1.1 0.0 MMMM.. 3.5 0.7 0.0 18 19 3.7 1.1 0.0 MMMM.. 3.4 0.7 0.0 19 20 3.4 1.1 0.0 MMMM. 3.1 0.7 0.0 20 21 3.4 1.1 0.0 MMMM. 3.2 0.7 0.0 21 22 4.2 1.1 0.0 MMMM%. 3.8 0.7 0.0 22 23 6.2 5.6 2.9 XMMM%.. 5.3 3.3 2.4 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) 17-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000