SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 18 May, 2026 T-index: 45 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 50-54 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.3 4.1 2.3 BBFF%. 00 01 7.1 5.0 2.8 ABBFF%. 01 02 7.5 5.6 3.0 ABBFF%.. 02 03 7.6 5.9 3.1 BBFF%%. 03 04 7.4 6.0 3.2 BBBF%.. 04 05 7.4 5.9 3.2 BBFF%.. 05 06 7.8 5.7 3.1 BBFF%%. 06 07 8.0 5.3 2.9 ABBFF%%. . 07 08 7.7 4.6 2.5 ABFFF%%. 08 09 6.8 3.0 1.8 ABFFF%%. 09 10 5.1 0.8 0.0 FFFFF%.. 10 11 3.8 0.8 0.0 FFF%.. 11 12 3.3 0.8 0.0 FFF%. 12 13 3.1 0.8 0.0 FFF%. 13 14 3.1 0.8 0.0 FFF.. 14 15 3.2 0.8 0.0 FFF.. 15 16 3.2 0.8 0.0 FFF%. 16 17 3.2 0.8 0.0 FFF%. 17 18 3.1 0.8 0.0 FFF%. 18 19 3.2 0.8 0.0 FFF%. 19 20 3.2 0.8 0.0 FFF%. 20 21 2.8 0.8 0.0 FF%.. 21 22 3.0 0.8 0.0 FF%. 22 23 4.5 0.8 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) 18-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000