SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 22 August, 2026 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 3.2 2.5 AFFF%. 00 01 7.1 3.8 2.8 AFFFF%. 01 02 7.5 4.1 3.0 ABFFF%.. 02 03 7.8 4.3 3.2 BFFF%%. 03 04 7.9 4.4 3.2 BFFF%%. 04 05 7.9 4.4 3.2 BFFF%%. 05 06 7.8 4.3 3.1 BFFF%%. 06 07 7.7 4.0 3.0 ABFFF%%. 07 08 7.5 3.6 2.7 AFFFF%.. 08 09 7.0 2.8 2.2 FFFF%%. 09 10 6.2 0.6 0.0 FFFFFF%.. 10 11 5.1 0.6 0.0 FFFFF%.. 11 12 4.3 0.6 0.0 FFFF%.. 12 13 4.0 0.6 0.0 FFF%%. 13 14 3.8 0.6 0.0 FFF%.. 14 15 3.6 0.6 0.0 FFF%. 15 16 3.5 0.6 0.0 FFF%. 16 17 3.4 0.6 0.0 FFF%. 17 18 3.3 0.6 0.0 FFF%. 18 19 3.2 0.6 0.0 FFF%. 19 20 3.1 0.6 0.0 FFF.. 20 21 3.0 0.6 0.0 FF%.. 21 22 3.2 0.6 0.0 FFF. 22 23 4.8 1.8 1.5 AFF%. 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) 22-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000