SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 11 July, 2026 T-index: 60 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 50-54 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.8 3.9 2.3 BFF%.. 00 01 6.8 5.0 2.8 ABBF%%. 01 02 7.1 5.6 3.0 ABBFF%.. 02 03 7.3 5.9 3.2 BBFF%.. 03 04 7.4 6.0 3.2 BBBF%.. 04 05 7.4 5.9 3.2 BBFF%.. 05 06 7.5 5.7 3.1 BBFF%.. 06 07 7.6 5.3 2.9 ABBFF%.. 07 08 7.4 4.5 2.5 ABFFF%.. 08 09 6.7 2.5 1.5 AFFFF%.. 09 10 5.1 0.8 0.0 FFFFF%.. 10 11 3.8 0.8 0.0 FFF%.. 11 12 3.3 0.8 0.0 FFF%. 12 13 3.1 0.8 0.0 FFF%. 13 14 3.0 0.8 0.0 FF%.. 14 15 3.0 0.8 0.0 FF%.. 15 16 3.0 0.8 0.0 FF%.. 16 17 3.0 0.8 0.0 FF%.. 17 18 3.0 0.8 0.0 FF%.. 18 19 2.9 0.8 0.0 FF%.. 19 20 3.0 0.8 0.0 FF%%. 20 21 2.8 0.8 0.0 FF%.. 21 22 2.9 0.8 0.0 FF%. 22 23 4.1 0.8 0.0 FFFF. 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) 11-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000