SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 1 March, 2026 T-index: 95 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 3.5 2.8 AFFF%. 00 01 6.6 3.9 3.1 FFF%%. 01 02 7.0 4.1 3.3 BFF%%.. 02 03 7.4 4.3 3.4 BFFF%.. 03 04 7.6 4.4 3.4 BFFF%%. 04 05 7.8 4.4 3.4 BFFF%%. . 05 06 7.8 4.2 3.3 BFFF%%. . 06 07 7.6 4.1 3.2 BFFF%%. . 07 08 7.4 3.7 3.0 AFFFF%%. 08 09 7.2 3.3 2.7 AFFFF%.. 09 10 6.9 2.4 2.1 FFFF%%.. 10 11 6.4 0.6 0.0 FFFFFF%%. 11 12 5.8 0.6 0.0 FFFFF%%. 12 13 5.4 0.6 0.0 FFFFF%.. 13 14 4.9 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 4.0 0.6 0.0 FFF%.. 19 20 3.7 0.6 0.0 FFF%. 20 21 3.6 0.6 0.0 FFF%. 21 22 4.2 1.0 1.0 AFFF%. 22 23 5.3 2.9 2.4 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) 1-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000