SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 12 May, 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 6.1 2.6 2.1 FFFF%. 00 01 7.0 3.2 2.5 AFFF%%. 01 02 7.5 3.6 2.7 AFFFF%.. 02 03 7.7 3.8 2.9 AFFFF%%. 03 04 7.6 3.9 2.9 AFFFF%%. 04 05 7.6 3.8 2.9 AFFFF%%. 05 06 7.8 3.7 2.8 AFFFF%%. 06 07 7.9 3.5 2.7 AFFFF%%. . 07 08 7.6 3.0 2.4 BFFFF%%. 08 09 7.0 2.2 1.8 AFFFF%%. 09 10 5.5 0.5 0.0 FFFFF%.. 10 11 4.2 0.5 0.0 FFFF%.. 11 12 3.6 0.5 0.0 FFF%.. 12 13 3.3 0.5 0.0 FFF%. 13 14 3.3 0.5 0.0 FFF%. 14 15 3.3 0.5 0.0 FFF%. 15 16 3.3 0.5 0.0 FFF%. 16 17 3.3 0.5 0.0 FFF%. 17 18 3.2 0.5 0.0 FFF%. 18 19 3.3 0.5 0.0 FFF%. 19 20 3.2 0.5 0.0 FFF%. 20 21 3.0 0.5 0.0 FF%.. 21 22 3.0 0.5 0.0 FF%. 22 23 4.5 0.5 0.0 FFFF%. 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) 12-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000