SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 23 January, 2026 T-index: 70 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-63 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.2 5.8 3.2 BB%%. 00 01 5.5 6.2 3.5 ABP%.. 01 02 6.0 6.6 3.6 ABP%.. 02 03 6.4 6.8 3.7 ABB%%. 03 04 6.7 6.9 3.8 ABB%%.. 04 05 6.8 6.8 3.7 ABB%%.. 05 06 6.7 6.7 3.7 ABB%%.. 06 07 6.5 6.4 3.6 ABB%%.. 07 08 6.3 6.0 3.4 BBB%%.. 08 09 6.1 5.4 3.1 BBF%%. 09 10 5.9 4.4 2.6 ABF%%.. 10 11 5.7 2.2 1.4 BFFF%%.. 11 12 5.5 0.8 0.0 FFFFF%%. 12 13 5.2 0.8 0.0 FFFFF%.. 13 14 4.9 0.8 0.0 FFFF%%. 14 15 4.8 0.8 0.0 FFFF%%. 15 16 4.6 0.8 0.0 FFFF%%. 16 17 4.4 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 3.8 0.8 0.0 FFF%.. 21 22 4.3 3.8 2.3 BF%.. 22 23 4.8 5.0 2.9 ABP%.. 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) 23-Jan-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000