SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 9 September, 2026 T-index: 60 Bearings: 8 188 Distance: 155 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F/1E: Near 90 1 5 10 15 20 25 30 35 40 ** NONE ** UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.9 3.1 2.4 BFF%%. 00 01 6.4 3.5 2.7 AFFF%.. 01 02 6.6 3.8 2.9 AFFF%%. 02 03 6.9 4.0 3.0 ABFF%%. 03 04 7.1 4.1 3.1 BFFF%.. 04 05 7.1 4.0 3.1 BFFF%.. 05 06 6.9 3.9 3.0 AFFF%%. 06 07 6.6 3.7 2.9 AFFF%%. 07 08 6.5 3.4 2.6 AFFF%%. 08 09 6.1 2.8 2.2 FFFF%. 09 10 5.5 1.1 1.0 AFFFF%%. 10 11 4.7 0.5 0.0 FFFF%%.. 11 12 4.1 0.5 0.0 FFFF%.. 12 13 3.7 0.5 0.0 FFF%%. 13 14 3.6 0.5 0.0 FFF%.. 14 15 3.6 0.5 0.0 FFF%. 15 16 3.5 0.5 0.0 FFF%. 16 17 3.4 0.5 0.0 FFF%. 17 18 3.3 0.5 0.0 FFF%. 18 19 3.2 0.5 0.0 FFF%. 19 20 3.0 0.5 0.0 FF%.. 20 21 3.0 0.5 0.0 FF%. 21 22 3.4 0.5 0.0 FFF%. 22 23 4.8 2.2 1.9 AFF%. 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) 9-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000