SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 13 September, 2025 T-index: 90 Bearings: 15 195 Distance: 196 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F/1E: Near 90 1 5 10 15 20 25 30 35 40 ** NONE ** UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.0 3.5 2.7 AFFF%%. 00 01 7.6 4.0 3.0 ABFFF%.. 01 02 8.0 4.3 3.2 BFFF%%. 02 03 8.3 4.5 3.3 BFFFF%. . 03 04 8.4 4.6 3.4 BFFFF%. . 04 05 8.5 4.6 3.4 BFFFF%% . 05 06 8.0 4.4 3.3 BFFF%%. . 06 07 7.8 4.2 3.1 BFFF%%. 07 08 7.6 3.8 2.9 AFFFF%%. 08 09 7.4 3.2 2.5 AFFFF%%. 09 10 6.8 1.7 1.4 FFFFF%%.. 10 11 5.9 0.6 0.0 FFFFF%%.. 11 12 5.2 0.6 0.0 FFFFF%.. 12 13 4.7 0.6 0.0 FFFF%%. 13 14 4.4 0.6 0.0 FFFF%.. 14 15 4.3 0.6 0.0 FFFF%. 15 16 4.0 0.6 0.0 FFF%%. 16 17 3.9 0.6 0.0 FFF%%. 17 18 3.8 0.6 0.0 FFF%.. 18 19 3.7 0.6 0.0 FFF%. 19 20 3.4 0.6 0.0 FFF%. 20 21 3.4 0.6 0.0 FFF%. 21 22 3.9 0.6 0.0 FFF%. 22 23 5.7 2.6 2.1 FFF%. 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) 13-Sep-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000