SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 8 September, 2026 T-index: 70 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 6.7 5.0 2.8 ABBF%%. 00 01 7.3 5.7 3.2 BBFF%.. 01 02 7.7 6.2 3.4 BBBF%%. 02 03 7.9 6.4 3.5 ABBF%%. . 03 04 8.1 6.5 3.6 ABBFF%. . 04 05 8.1 6.5 3.5 ABBFF%. . 05 06 7.7 6.3 3.4 BBBF%%. . 06 07 7.4 5.9 3.3 BBFF%%. 07 08 7.3 5.3 3.0 ABBFF%%. 08 09 7.0 4.4 2.5 ABFF%%.. 09 10 6.2 0.8 0.0 FFFFFF%%. 10 11 5.2 0.8 0.0 FFFFF%%.. 11 12 4.5 0.8 0.0 FFFF%%. 12 13 4.1 0.8 0.0 FFFF%.. 13 14 3.9 0.8 0.0 FFF%%. 14 15 3.8 0.8 0.0 FFF%.. 15 16 3.7 0.8 0.0 FFF%.. 16 17 3.6 0.8 0.0 FFF%.. 17 18 3.4 0.8 0.0 FFF%. 18 19 3.3 0.8 0.0 FFF%. 19 20 3.1 0.8 0.0 FFF%. 20 21 3.0 0.8 0.0 FF%%. 21 22 3.6 0.8 0.0 FFF%. 22 23 5.5 3.7 2.2 BFF%. 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) 8-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000