SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 3 March, 2026 T-index: 100 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 52-61 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.0 5.0 3.2 BBF%%.. 00 01 7.5 5.6 3.5 ABFF%%. 01 02 8.0 5.9 3.7 ABFF%%. . 02 03 8.4 6.2 3.8 ABBFF%% . 03 04 8.7 6.3 3.8 ABBFF%% .. 04 05 8.9 6.3 3.8 ABBFF%% .. 05 06 8.9 6.1 3.7 ABBFF%% .. 06 07 8.6 5.8 3.6 ABFFF%% .. 07 08 8.3 5.4 3.4 BBFFF%% .. 08 09 8.1 4.7 3.0 ABFFFF%% . 09 10 7.6 3.5 2.3 BFFFF%%. . 10 11 7.0 0.8 0.0 FFFFFF%%.. 11 12 6.4 0.8 0.0 FFFFFF%%. 12 13 5.9 0.8 0.0 FFFFF%%.. 13 14 5.5 0.8 0.0 FFFFF%.. 14 15 5.2 0.8 0.0 FFFFF%.. 15 16 5.1 0.8 0.0 FFFFF%.. 16 17 4.9 0.8 0.0 FFFF%%. 17 18 4.7 0.8 0.0 FFFF%.. 18 19 4.4 0.8 0.0 FFFF%. 19 20 4.0 0.8 0.0 FFF%%. 20 21 3.9 0.8 0.0 FFF%.. 21 22 4.4 0.8 0.0 FFFF%. 22 23 5.8 4.0 2.6 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) 3-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000