SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 11 November, 2025 T-index: 90 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 52-64 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.3 5.2 3.2 BBF%%.. 00 01 6.7 5.7 3.5 ABF%%.. 01 02 7.2 6.0 3.7 ABBF%%. . 02 03 7.7 6.2 3.8 ABBF%%. . 03 04 8.0 6.3 3.8 ABBF%%% .. 04 05 8.2 6.3 3.8 ABBFF%% .. 05 06 7.9 6.1 3.7 ABBF%%% .. 06 07 7.6 5.9 3.6 ABFF%%. . 07 08 7.4 5.5 3.4 BBFF%%. . 08 09 7.3 4.9 3.1 BFFF%%. . 09 10 7.0 4.0 2.6 ABFF%%%. 10 11 6.8 1.0 0.8 AFFFFF%%.. 11 12 6.3 0.8 0.0 FFFFFF%%. 12 13 5.8 0.8 0.0 FFFFF%%.. 13 14 5.5 0.8 0.0 FFFFF%%. 14 15 5.4 0.8 0.0 FFFFF%.. 15 16 5.3 0.8 0.0 FFFFF%.. 16 17 5.0 0.8 0.0 FFFF%%. 17 18 4.8 0.8 0.0 FFFF%%. 18 19 4.5 0.8 0.0 FFFF%.. 19 20 4.3 0.8 0.0 FFFF%. 20 21 4.5 0.8 0.0 FFFF%.. 21 22 5.1 3.0 2.0 ABFF%.. 22 23 5.8 4.4 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) 11-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000