SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 19 November, 2025 T-index: 115 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 52-65 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.8 6.0 3.5 ABB%%.. 00 01 7.2 6.6 3.8 ABBF%.. . 01 02 7.6 6.9 3.9 ABBF%%. . 02 03 7.9 7.1 4.0 ABBB%%. . 03 04 8.2 7.2 4.1 BBBF%% .. 04 05 8.3 7.2 4.1 BBBF%% .. 05 06 7.9 7.0 4.0 ABBB%%. . 06 07 7.8 6.7 3.8 ABBF%%. . 07 08 7.6 6.3 3.6 ABBF%%. . 08 09 7.5 5.6 3.3 BBFF%%. . 09 10 7.5 4.6 2.8 ABFFF%%. . 10 11 7.4 2.2 1.5 AFFFFF%%. 11 12 7.0 1.0 0.0 BFFFFF%%.. 12 13 6.5 1.0 0.0 BFFFFF%%. 13 14 6.1 1.0 0.0 BFFFFF%. 14 15 5.8 1.0 0.0 BFFFF%%. 15 16 5.7 1.0 0.0 BFFFF%%. 16 17 5.4 1.0 0.0 BFFFF%.. 17 18 4.9 1.0 0.0 BFFF%%. 18 19 4.6 1.0 0.0 BFFF%.. 19 20 4.4 1.0 0.0 BFFF%. 20 21 4.7 1.0 0.0 BFFF%%. 21 22 5.5 4.0 2.5 ABF%%. 22 23 6.3 5.3 3.1 BBF%.. 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) 19-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000