SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 17 September, 2025 T-index: 100 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 38-45 1E 15 1 5 10 15 20 25 30 35 40 2F 58-64 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.1 7.5 3.8 AXMMMMM% .. 7.8 4.5 3.0 00 01 9.6 8.4 4.1 SXMMMM% %. 8.4 5.1 3.3 01 02 10.0 8.9 4.4 AXMMMMM %.. 8.7 5.5 3.5 02 03 10.3 9.3 4.5 AXMMMMM %%. 9.0 5.7 3.6 03 04 10.4 9.4 4.6 AXMMMMM %%.. 9.1 5.7 3.7 04 05 10.4 9.3 4.5 AXMMMMM %%.. 9.0 5.7 3.6 05 06 9.9 9.0 4.4 AXMMMMM %.. 8.6 5.5 3.5 06 07 9.6 8.5 4.2 SXMMMMM %.. 8.3 5.1 3.4 07 08 9.4 7.6 3.8 XMMMMM% %.. 8.2 4.6 3.1 08 09 9.3 6.2 3.2 AMMMMMM% %. 8.1 3.7 2.7 09 10 8.5 1.3 0.0 MMMMMMMMM% .. 7.4 0.0 1.4 10 11 7.3 1.3 0.0 MMMMMMMM%. . 6.3 0.8 0.0 11 12 6.4 1.3 0.0 MMMMMMM%. 5.7 0.8 0.0 12 13 5.9 1.3 0.0 MMMMMM%.. 5.2 0.8 0.0 13 14 5.5 1.3 0.0 MMMMMM.. 4.9 0.8 0.0 14 15 5.2 1.3 0.0 MMMMMM.. 4.8 0.8 0.0 15 16 4.9 1.3 0.0 MMMMM%. 4.5 0.8 0.0 16 17 4.8 1.3 0.0 MMMMM%. 4.4 0.8 0.0 17 18 4.6 1.3 0.0 MMMMM.. 4.2 0.8 0.0 18 19 4.4 1.3 0.0 MMMMM. 4.0 0.8 0.0 19 20 4.1 1.3 0.0 MMMM%. 3.7 0.8 0.0 20 21 4.0 1.3 0.0 MMMM%. 3.7 0.8 0.0 21 22 5.2 1.3 0.0 MMMMM%. 4.6 0.8 0.0 22 23 7.8 5.9 3.1 AMMMM%%. 6.6 3.5 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) 17-Sep-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000