SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 29 March, 2026 T-index: 90 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 7.0 3.2 2.6 AFFF%%. 00 01 7.7 3.7 2.9 AFFFF%%. 01 02 8.1 4.0 3.1 BFFFF%. . 02 03 8.4 4.2 3.2 BFFFF%% . 03 04 8.7 4.2 3.3 BFFFF%% . 04 05 8.9 4.2 3.3 BFFFF%% .. 05 06 8.7 4.1 3.2 BFFFF%% .. 06 07 8.5 3.9 3.1 FFFFF%% . 07 08 8.3 3.5 2.8 AFFFFF%% . 08 09 7.9 3.0 2.4 BFFFF%%. . 09 10 7.0 1.6 1.4 FFFFF%%.. 10 11 6.0 0.5 0.0 FFFFF%%.. 11 12 5.4 0.5 0.0 FFFFF%%. 12 13 4.8 0.5 0.0 FFFF%%. 13 14 4.5 0.5 0.0 FFFF%.. 14 15 4.4 0.5 0.0 FFFF%.. 15 16 4.3 0.5 0.0 FFFF%. 16 17 4.2 0.5 0.0 FFFF%. 17 18 4.1 0.5 0.0 FFFF%. 18 19 3.9 0.5 0.0 FFF%.. 19 20 3.7 0.5 0.0 FFF%. 20 21 3.5 0.5 0.0 FFF%. 21 22 3.9 0.5 0.0 FFF%. 22 23 5.5 2.4 2.0 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) 29-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000