SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 3 December, 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 6.6 6.1 3.5 ABB%%.. 00 01 7.0 6.6 3.8 ABB%%.. 01 02 7.4 6.9 3.9 ABBF%%. . 02 03 7.7 7.1 4.0 ABBB%%. . 03 04 8.0 7.2 4.1 BBB%%. . 04 05 8.0 7.2 4.1 BBB%%. .. 05 06 7.8 7.0 4.0 ABBB%%. . 06 07 7.6 6.7 3.9 ABBF%%. . 07 08 7.5 6.3 3.6 ABBF%%. . 08 09 7.4 5.7 3.3 BBFF%%. . 09 10 7.4 4.8 2.9 ABFFF%%. 10 11 7.3 2.9 1.9 AFFFFF%%. 11 12 6.9 1.0 0.0 BFFFFF%%.. 12 13 6.6 1.0 0.0 BFFFFF%%. 13 14 6.2 1.0 0.0 BFFFFF%.. 14 15 6.0 1.0 0.0 BFFFF%%. 15 16 5.8 1.0 0.0 BFFFF%%. 16 17 5.5 1.0 0.0 BFFFF%.. 17 18 5.1 1.0 0.0 BFFFF%. 18 19 4.6 1.0 0.0 BFFF%%. 19 20 4.4 1.0 0.0 BFFF%. 20 21 4.6 1.0 0.0 BFFF%%. 21 22 5.5 4.2 2.6 ABF%.. 22 23 6.1 5.4 3.2 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) 3-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000