SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 8 November, 2025 T-index: 65 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-62 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.7 5.6 3.2 BB%%.. 00 01 6.0 6.2 3.4 BBP%.. 01 02 6.5 6.5 3.6 ABB%%.. 02 03 7.0 6.7 3.7 ABB%%.. 03 04 7.3 6.8 3.7 ABBF%%. . 04 05 7.4 6.8 3.7 ABBF%%. . 05 06 7.2 6.6 3.6 ABBF%%. 06 07 7.0 6.3 3.5 ABB%%.. 07 08 6.8 5.9 3.3 BBF%%.. 08 09 6.7 5.2 3.0 ABBF%%.. 09 10 6.4 4.2 2.5 ABFF%%.. 10 11 6.0 0.8 0.0 FFFFF%%%. 11 12 5.6 0.8 0.0 FFFFF%%.. 12 13 5.0 0.8 0.0 FFFF%%.. 13 14 4.7 0.8 0.0 FFFF%%. 14 15 4.5 0.8 0.0 FFFF%.. 15 16 4.5 0.8 0.0 FFFF%.. 16 17 4.2 0.8 0.0 FFFF%. 17 18 4.1 0.8 0.0 FFFF%. 18 19 3.9 0.8 0.0 FFF%.. 19 20 3.7 0.8 0.0 FFF%.. 20 21 4.0 0.8 0.0 FFF%.. 21 22 4.8 3.5 2.1 BF%%. 22 23 5.2 4.9 2.8 ABF%.. 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) 8-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000