SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 15 November, 2025 T-index: 100 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 53-65 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.5 5.2 3.3 BBF%%.. 00 01 6.9 5.7 3.6 ABF%%.. . 01 02 7.4 6.1 3.7 ABBF%%. . 02 03 7.9 6.3 3.8 ABBF%%. . 03 04 8.1 6.4 3.9 ABBFF%% .. 04 05 8.3 6.4 3.9 ABBFF%% .. 05 06 8.1 6.2 3.8 ABBFF%% .. 06 07 7.7 6.0 3.7 ABBF%%. . 07 08 7.6 5.6 3.5 ABFF%%. . 08 09 7.4 5.0 3.2 BBFF%%. . 09 10 7.3 4.1 2.7 ABFFF%%. . 10 11 7.2 1.7 1.3 FFFFFF%%. 11 12 6.7 0.8 0.0 FFFFFF%%.. 12 13 6.2 0.8 0.0 FFFFFF%.. 13 14 5.9 0.8 0.0 FFFFF%%. 14 15 5.8 0.8 0.0 FFFFF%%. 15 16 5.7 0.8 0.0 FFFFF%%. 16 17 5.3 0.8 0.0 FFFFF%.. 17 18 5.0 0.8 0.0 FFFF%%. 18 19 4.7 0.8 0.0 FFFF%.. 19 20 4.5 0.8 0.0 FFFF%.. 20 21 4.7 0.8 0.0 FFFF%.. 21 22 5.3 3.1 2.1 BFF%.. 22 23 6.0 4.5 2.9 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) 15-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000