SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 27 October, 2025 T-index: 110 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 6.8 3.6 3.0 AFFF%%. 00 01 7.2 4.0 3.2 BFFF%.. 01 02 7.6 4.3 3.4 BFFF%%. 02 03 8.2 4.4 3.5 AFFFF%. . 03 04 8.4 4.5 3.5 AFFFF%% . 04 05 8.6 4.5 3.5 AFFFF%% . 05 06 8.4 4.4 3.4 BFFFF%% . 06 07 8.0 4.2 3.3 BFFF%%. . 07 08 7.8 3.9 3.1 FFFF%%. 08 09 7.6 3.4 2.8 AFFFF%%. 09 10 7.3 2.7 2.3 FFFFF%%. 10 11 6.9 0.6 0.0 FFFFFF%%.. 11 12 6.5 0.6 0.0 FFFFFF%%. 12 13 5.9 0.6 0.0 FFFFF%%. 13 14 5.5 0.6 0.0 FFFFF%.. 14 15 5.3 0.6 0.0 FFFFF%.. 15 16 5.1 0.6 0.0 FFFFF%. 16 17 4.9 0.6 0.0 FFFF%%. 17 18 4.6 0.6 0.0 FFFF%.. 18 19 4.4 0.6 0.0 FFFF%. 19 20 4.2 0.6 0.0 FFFF%. 20 21 4.3 0.6 0.0 FFFF%. 21 22 5.2 1.9 1.7 AFFF%. 22 23 6.2 3.1 2.6 AFFF%. 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) 27-Oct-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000