SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 1 May, 2025 T-index: 115 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 8.1 3.2 2.5 AFFFFF%. 00 01 9.3 3.8 2.9 AFFFFFF% .. 01 02 10.0 4.2 3.2 BFFFFF% %. 02 03 10.4 4.4 3.3 BFFFFFF %.. 03 04 10.4 4.5 3.4 BFFFFFF %.. 04 05 10.5 4.5 3.4 BFFFFFF %.. 05 06 10.5 4.4 3.3 BFFFFFF %.. 06 07 10.3 4.1 3.1 BFFFFFF %.. 07 08 10.0 3.6 2.8 AFFFFFF% %.. 08 09 9.5 2.7 2.2 FFFFFFF% %. 09 10 8.3 0.6 0.0 FFFFFFFF%. . 10 11 6.9 0.6 0.0 FFFFFF%%. 11 12 5.9 0.6 0.0 FFFFF%.. 12 13 5.1 0.6 0.0 FFFFF%. 13 14 4.7 0.6 0.0 FFFF%. 14 15 4.4 0.6 0.0 FFFF%. 15 16 4.3 0.6 0.0 FFFF%. 16 17 4.2 0.6 0.0 FFFF%. 17 18 4.0 0.6 0.0 FFF%%. 18 19 3.9 0.6 0.0 FFF%%. 19 20 3.7 0.6 0.0 FFF%. 20 21 3.5 0.6 0.0 FFF%. 21 22 3.7 0.6 0.0 FFF%. 22 23 5.8 1.1 1.1 FFFF%. 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-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000