SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Perth district Date: 7 November, 2025 T-index: 70 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 5.4 2.9 2.5 AFF%%. 00 01 5.8 3.2 2.7 AFF%%.. 01 02 6.2 3.4 2.8 AFFF%.. 02 03 6.7 3.5 2.9 AFFF%%. 03 04 7.0 3.6 2.9 AFFF%%.. 04 05 7.1 3.6 2.9 AFFFF%.. 05 06 6.9 3.5 2.9 AFFF%%.. 06 07 6.7 3.3 2.8 AFFF%%.. 07 08 6.5 3.1 2.6 AFFF%%. 08 09 6.4 2.8 2.4 FFFF%%. 09 10 6.0 2.2 2.0 AFFF%%.. 10 11 5.6 0.4 0.0 FFFFF%%.. 11 12 5.3 0.4 0.0 FFFFF%%. 12 13 4.8 0.4 0.0 FFFF%%. 13 14 4.5 0.4 0.0 FFFF%%. 14 15 4.5 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 4.1 0.4 0.0 FFFF%. 18 19 3.9 0.4 0.0 FFF%.. 19 20 3.7 0.4 0.0 FFF%. 20 21 3.9 0.4 0.0 FFF%.. 21 22 4.5 1.7 1.6 AFF%.. 22 23 5.0 2.5 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) 7-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000