SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 29 September, 2026 T-index: 55 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 52-59 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.3 4.6 2.8 ABFF%.. 00 01 6.6 5.2 3.1 BBF%%. 01 02 6.9 5.6 3.3 BBF%%.. 02 03 7.2 5.8 3.5 ABFF%.. 03 04 7.5 5.9 3.5 ABFF%%. 04 05 7.6 5.9 3.5 ABFF%%. . 05 06 7.3 5.7 3.4 BBFF%%. 06 07 7.0 5.5 3.3 BBF%%.. 07 08 6.8 5.0 3.1 BBF%%.. 08 09 6.5 4.3 2.7 ABFF%%. 09 10 6.0 3.0 2.0 ABFF%%.. 10 11 5.2 0.7 0.0 FFFFF%%.. 11 12 4.6 0.7 0.0 FFFF%%.. 12 13 4.2 0.7 0.0 FFFF%.. 13 14 4.0 0.7 0.0 FFF%%. 14 15 4.0 0.7 0.0 FFF%%. 15 16 3.9 0.7 0.0 FFF%%. 16 17 3.8 0.7 0.0 FFF%.. 17 18 3.6 0.7 0.0 FFF%. 18 19 3.5 0.7 0.0 FFF%. 19 20 3.3 0.7 0.0 FFF%. 20 21 3.3 0.7 0.0 FFF%. 21 22 4.1 0.7 0.0 FFFF%. 22 23 5.4 3.6 2.3 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) 29-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000