SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 20 September, 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 51-57 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.4 5.1 2.9 ABBF%.. 00 01 6.8 5.8 3.2 BBF%%. 01 02 7.2 6.2 3.4 BBBF%.. 02 03 7.4 6.4 3.5 ABBF%%. 03 04 7.7 6.5 3.5 ABBF%%. . 04 05 7.7 6.5 3.5 ABBF%%. . 05 06 7.3 6.3 3.4 BBBF%%. 06 07 7.0 6.0 3.3 BBB%%.. 07 08 6.8 5.4 3.0 ABBF%%.. 08 09 6.6 4.6 2.6 ABFF%%. 09 10 6.0 2.5 1.6 AFFF%%.. 10 11 5.1 0.8 0.0 FFFFF%%. 11 12 4.5 0.8 0.0 FFFF%%. 12 13 4.0 0.8 0.0 FFF%%.. 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 3.5 0.8 0.0 FFF%. 18 19 3.4 0.8 0.0 FFF%. 19 20 3.1 0.8 0.0 FFF%. 20 21 3.1 0.8 0.0 FFF%. 21 22 3.8 0.8 0.0 FFF%. 22 23 5.4 4.0 2.3 BBF%. 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) 20-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000