SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 12 July, 2025 T-index: 75 Bearings: 8 188 Distance: 155 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 5.6 2.5 2.0 AFFF%. 00 01 6.6 3.2 2.5 AFFF%.. 01 02 7.0 3.6 2.7 AFFF%%. 02 03 7.2 3.8 2.9 AFFFF%.. 03 04 7.3 3.9 2.9 AFFFF%.. 04 05 7.3 3.8 2.9 AFFFF%.. 05 06 7.4 3.7 2.8 AFFFF%.. 06 07 7.4 3.4 2.7 AFFFF%.. 07 08 7.3 2.9 2.3 FFFFF%.. 08 09 6.7 1.9 1.6 AFFFF%.. 09 10 5.2 0.5 0.0 FFFFF%.. 10 11 4.0 0.5 0.0 FFF%%. 11 12 3.5 0.5 0.0 FFF%. 12 13 3.2 0.5 0.0 FFF%. 13 14 3.0 0.5 0.0 FF%.. 14 15 3.0 0.5 0.0 FF%.. 15 16 3.0 0.5 0.0 FF%.. 16 17 3.0 0.5 0.0 FF%.. 17 18 3.0 0.5 0.0 FF%.. 18 19 3.0 0.5 0.0 FF%.. 19 20 3.0 0.5 0.0 FF%.. 20 21 2.9 0.5 0.0 FF%.. 21 22 2.9 0.5 0.0 FF%. 22 23 4.0 0.5 0.0 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) 12-Jul-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000