SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 21 May, 2026 T-index: 55 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 6.4 4.1 2.3 BBFF%. 00 01 7.4 5.1 2.8 ABBFF%.. 01 02 7.9 5.6 3.0 ABBFF%%. . 02 03 8.0 5.9 3.2 BBFF%%. . 03 04 7.9 6.0 3.2 BBBF%%. . 04 05 7.9 6.0 3.2 BBBF%%. . 05 06 8.1 5.8 3.1 BBFFF%. . 06 07 8.4 5.3 2.9 ABBFFF%. . 07 08 8.0 4.6 2.6 ABFFF%%. . 08 09 7.2 2.9 1.8 AFFFFF%.. 09 10 5.5 0.8 0.0 FFFFF%.. 10 11 4.1 0.8 0.0 FFFF%.. 11 12 3.5 0.8 0.0 FFF%.. 12 13 3.2 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 3.2 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 2.9 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) 21-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000