SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Perth district Date: 11 January, 2026 T-index: 65 Bearings: 0 180 Distance: 0-300 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 60-90 1E 40-90 1 5 10 15 20 25 30 35 40 ** NONE ** UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 4.8 3.0 2.5 AF%%. 00 01 5.2 3.2 2.7 AFF%.. 01 02 5.6 3.4 2.8 AFF%%. 02 03 6.0 3.5 2.9 AFF%%.. 03 04 6.2 3.6 2.9 AFFF%.. 04 05 6.3 3.6 2.9 AFFF%.. 05 06 6.3 3.5 2.9 AFFF%.. 06 07 6.1 3.4 2.8 AFFF%.. 07 08 5.9 3.1 2.6 AFF%%.. 08 09 5.8 2.8 2.4 FFF%%. 09 10 5.4 2.4 2.1 FFF%%. 10 11 5.2 1.4 1.4 FFFF%.. 11 12 5.1 0.4 0.0 FFFFF%.. 12 13 4.8 0.4 0.0 FFFF%%. 13 14 4.7 0.4 0.0 FFFF%%. 14 15 4.6 0.4 0.0 FFFF%.. 15 16 4.4 0.4 0.0 FFFF%. 16 17 4.2 0.4 0.0 FFFF%. 17 18 4.0 0.4 0.0 FFF%.. 18 19 3.8 0.4 0.0 FFF%.. 19 20 3.6 0.4 0.0 FFF%. 20 21 3.6 0.4 0.0 FFF%. 21 22 4.0 2.0 1.8 AF%%. 22 23 4.5 2.6 2.2 FF%.. 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) 11-Jan-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000