SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 12 March, 2026 T-index: 100 Bearings: 15 195 Distance: 196 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 3.7 2.9 AFFF%.. 00 01 7.4 4.2 3.2 BFFF%.. 01 02 7.8 4.5 3.4 BFFF%%. 02 03 8.1 4.6 3.5 AFFFF%. . 03 04 8.4 4.7 3.5 AFFFF%. . 04 05 8.6 4.7 3.5 AFFFF%% . 05 06 8.6 4.6 3.4 BFFFF%% . 06 07 8.4 4.4 3.3 BFFFF%% . 07 08 8.1 4.0 3.1 BFFFF%. . 08 09 7.9 3.5 2.7 AFFFF%%. 09 10 7.4 2.4 2.0 AFFFFF%%. 10 11 6.8 0.6 0.0 FFFFFF%%.. 11 12 6.1 0.6 0.0 FFFFFF%.. 12 13 5.5 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 4.4 0.6 0.0 FFFF%. 18 19 4.1 0.6 0.0 FFFF%. 19 20 3.9 0.6 0.0 FFF%. 20 21 3.8 0.6 0.0 FFF%. 21 22 4.3 0.6 0.0 FFFF%. 22 23 5.7 3.0 2.4 BFF%. 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) 12-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000