SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 7 February, 2026 T-index: 125 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 6.7 5.3 3.4 BBF%%.. 00 01 7.2 5.8 3.7 ABFF%.. . 01 02 7.7 6.2 3.9 ABBF%%. . 02 03 8.0 6.4 4.0 ABBF%%. .. 03 04 8.3 6.5 4.0 ABBFF%% .. 04 05 8.4 6.5 4.0 ABBFF%% .. 05 06 8.4 6.4 4.0 ABBFF%% .. 06 07 8.2 6.1 3.8 ABBFF%% .. 07 08 7.9 5.7 3.6 ABFF%%% . 08 09 7.6 5.1 3.3 BBFF%%. . 09 10 7.5 4.1 2.7 ABFFF%%. 10 11 7.4 0.9 0.0 FFFFFFF%.. 11 12 7.2 0.9 0.0 FFFFFFF%.. 12 13 7.0 0.9 0.0 FFFFFF%%. 13 14 6.4 0.9 0.0 FFFFFF%.. 14 15 6.1 0.9 0.0 FFFFFF%. 15 16 5.9 0.9 0.0 FFFFF%%. 16 17 5.7 0.9 0.0 FFFFF%%. 17 18 5.1 0.9 0.0 FFFFF%. 18 19 4.5 0.9 0.0 FFFF%%. 19 20 4.2 0.9 0.0 FFFF%. 20 21 4.1 0.9 0.0 FFFF%. 21 22 4.8 2.9 2.0 AFF%%. 22 23 5.9 4.5 3.0 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) 7-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000