SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 16 May, 2025 T-index: 90 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-55 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.6 4.4 2.5 ABFFF%.. 00 01 8.9 5.3 3.0 ABBFFF%% .. 01 02 9.7 5.9 3.3 BBFFFF% %.. 02 03 10.0 6.2 3.4 BBBFFF% %.. 03 04 9.7 6.3 3.5 ABBFFF% %. 04 05 9.7 6.3 3.4 BBBFFF% %.. 05 06 9.8 6.0 3.3 BBBFFF% %.. 06 07 9.9 5.6 3.1 BBFFFF% %.. 07 08 9.6 4.8 2.8 ABFFFFF% %.. 08 09 8.9 3.2 2.0 ABFFFFF%% .. 09 10 7.2 0.9 0.0 FFFFFFF%.. 10 11 5.5 0.9 0.0 FFFFF%.. 11 12 4.6 0.9 0.0 FFFF%.. 12 13 3.9 0.9 0.0 FFF%.. 13 14 3.8 0.9 0.0 FFF%.. 14 15 3.7 0.9 0.0 FFF%.. 15 16 3.7 0.9 0.0 FFF%.. 16 17 3.6 0.9 0.0 FFF%.. 17 18 3.5 0.9 0.0 FFF%.. 18 19 3.5 0.9 0.0 FFF%.. 19 20 3.4 0.9 0.0 FFF%.. 20 21 3.1 0.9 0.0 FFF%. 21 22 3.3 0.9 0.0 FFF%. 22 23 5.3 0.9 0.0 FFFFF%. 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) 16-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000