SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 2 July, 2025 T-index: 80 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 5.7 2.4 2.0 AFFF%. 00 01 6.8 3.2 2.5 AFFF%.. 01 02 7.3 3.6 2.7 AFFFF%.. 02 03 7.6 3.8 2.9 AFFFF%.. 03 04 7.6 3.9 2.9 AFFFF%.. 04 05 7.7 3.8 2.9 AFFFF%.. 05 06 7.6 3.7 2.8 AFFFF%.. 06 07 7.7 3.4 2.7 AFFFF%.. 07 08 7.5 2.9 2.3 FFFFF%.. 08 09 6.9 1.8 1.5 AFFFF%%. 09 10 5.4 0.5 0.0 FFFFF%.. 10 11 4.1 0.5 0.0 FFFF%. 11 12 3.6 0.5 0.0 FFF%. 12 13 3.3 0.5 0.0 FFF%. 13 14 3.1 0.5 0.0 FFF.. 14 15 3.1 0.5 0.0 FFF.. 15 16 3.1 0.5 0.0 FFF.. 16 17 3.1 0.5 0.0 FFF.. 17 18 3.1 0.5 0.0 FFF.. 18 19 3.1 0.5 0.0 FFF%. 19 20 3.1 0.5 0.0 FFF%. 20 21 3.0 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) 2-Jul-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000