SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 1 September, 2026 T-index: 65 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-56 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.5 4.8 2.8 ABFF%.. 00 01 7.0 5.6 3.1 BBF%%.. 01 02 7.4 6.1 3.3 BBBF%.. 02 03 7.7 6.3 3.4 BBBF%%. . 03 04 7.8 6.4 3.5 ABBF%%. . 04 05 7.9 6.4 3.5 ABBF%%. . 05 06 7.6 6.2 3.4 BBBF%%. . 06 07 7.5 5.8 3.2 BBFF%%. 07 08 7.3 5.2 2.9 ABBFF%.. 08 09 6.9 4.2 2.4 BBFF%%. 09 10 6.0 0.8 0.0 FFFFF%%.. 10 11 4.9 0.8 0.0 FFFF%%.. 11 12 4.2 0.8 0.0 FFFF%.. 12 13 3.9 0.8 0.0 FFF%%. 13 14 3.7 0.8 0.0 FFF%.. 14 15 3.6 0.8 0.0 FFF%.. 15 16 3.5 0.8 0.0 FFF%. 16 17 3.5 0.8 0.0 FFF%. 17 18 3.3 0.8 0.0 FFF%. 18 19 3.2 0.8 0.0 FFF%. 19 20 3.0 0.8 0.0 FF%%. 20 21 2.9 0.8 0.0 FF%.. 21 22 3.3 0.8 0.0 FFF%. 22 23 5.1 3.4 2.0 ABFF%. 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) 1-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000