SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 13 October, 2025 T-index: 80 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 6.4 3.7 2.8 AFFF%. 00 01 6.8 4.1 3.1 BFF%%. 01 02 7.1 4.4 3.3 BFFF%. 02 03 7.5 4.6 3.4 BFFF%%. 03 04 7.8 4.7 3.4 BFFF%%. . 04 05 8.0 4.6 3.4 BFFF%%. . 05 06 7.7 4.5 3.3 BFFF%%. . 06 07 7.2 4.3 3.2 BFFF%%. 07 08 7.0 4.0 3.0 ABFF%%.. 08 09 6.9 3.5 2.7 AFFF%%.. 09 10 6.4 2.6 2.1 FFFF%%.. 10 11 5.7 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 4.5 0.6 0.0 FFFF%.. 14 15 4.4 0.6 0.0 FFFF%.. 15 16 4.2 0.6 0.0 FFFF%. 16 17 4.1 0.6 0.0 FFFF%. 17 18 4.0 0.6 0.0 FFF%%. 18 19 3.7 0.6 0.0 FFF%.. 19 20 3.6 0.6 0.0 FFF%. 20 21 3.6 0.6 0.0 FFF%. 21 22 4.6 1.1 1.0 AFFF%. 22 23 5.7 3.1 2.4 BFF%.. 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-Oct-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000