SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 13 March, 2026 T-index: 100 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 6.7 3.4 2.8 AFFF%.. 00 01 7.4 3.8 3.1 FFFF%.. 01 02 7.8 4.1 3.2 BFFF%%. 02 03 8.2 4.3 3.4 BFFFF%. . 03 04 8.4 4.4 3.4 BFFFF%. . 04 05 8.7 4.3 3.4 BFFFF%% . 05 06 8.5 4.2 3.3 BFFFF%% . 06 07 8.4 4.0 3.2 BFFFF%% . 07 08 8.1 3.7 3.0 AFFFFF%. . 08 09 7.9 3.2 2.6 AFFFF%%. 09 10 7.4 2.2 1.9 AFFFFF%%. 10 11 6.7 0.6 0.0 FFFFFF%%.. 11 12 6.0 0.6 0.0 FFFFF%%.. 12 13 5.4 0.6 0.0 FFFFF%.. 13 14 5.0 0.6 0.0 FFFF%%. 14 15 4.8 0.6 0.0 FFFF%.. 15 16 4.7 0.6 0.0 FFFF%.. 16 17 4.5 0.6 0.0 FFFF%.. 17 18 4.3 0.6 0.0 FFFF%. 18 19 4.1 0.6 0.0 FFFF%. 19 20 3.8 0.6 0.0 FFF%. 20 21 3.8 0.6 0.0 FFF%. 21 22 4.2 0.6 0.0 FFFF%. 22 23 5.7 2.7 2.3 FFF%. 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) 13-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000