SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 4 February, 2026 T-index: 120 Bearings: 8 188 Distance: 155 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F/1E: Near 90 1 5 10 15 20 25 30 35 40 ** NONE ** UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.1 3.7 3.1 FFF%.. 00 01 6.5 4.1 3.3 BFF%%.. 01 02 6.9 4.3 3.5 AFF%%.. 02 03 7.2 4.5 3.6 AFFF%.. 03 04 7.5 4.5 3.6 AFFF%%. . 04 05 7.5 4.5 3.6 AFFF%%. . 05 06 7.5 4.4 3.5 AFFF%%. . 06 07 7.3 4.2 3.4 BFFF%%. 07 08 7.1 4.0 3.2 BFFF%.. 08 09 6.9 3.5 2.9 AFFF%%.. 09 10 6.8 2.9 2.5 AFFF%%. 10 11 6.7 0.6 0.5 AFFFFF%%. 11 12 6.5 0.6 0.0 FFFFFF%.. 12 13 6.3 0.6 0.0 FFFFFF%. 13 14 5.8 0.6 0.0 FFFFF%%. 14 15 5.6 0.6 0.0 FFFFF%.. 15 16 5.4 0.6 0.0 FFFFF%. 16 17 5.2 0.6 0.0 FFFFF%. 17 18 4.7 0.6 0.0 FFFF%. 18 19 4.2 0.6 0.0 FFFF%. 19 20 3.9 0.6 0.0 FFF%%. 20 21 3.9 0.6 0.0 FFF%% 21 22 4.5 2.2 2.0 AFF%.. 22 23 5.5 3.2 2.7 AFF%.. 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) 4-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000