SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 1 May, 2025 T-index: 115 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 8.0 2.9 2.4 FFFFF%%. 00 01 9.3 3.5 2.8 AFFFFFF% . 01 02 10.0 3.9 3.1 FFFFFF% %. 02 03 10.3 4.1 3.2 BFFFFFF %.. 03 04 10.3 4.2 3.3 BFFFFFF %.. 04 05 10.4 4.1 3.2 BFFFFFF %.. 05 06 10.4 4.0 3.2 BFFFFFF %.. 06 07 10.2 3.8 3.0 AFFFFFFF %.. 07 08 9.9 3.3 2.7 AFFFFFF% %. 08 09 9.4 2.5 2.1 FFFFFFF% .. 09 10 8.2 0.6 0.0 FFFFFFFF%. . 10 11 6.8 0.6 0.0 FFFFFF%%. 11 12 5.8 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 3.4 0.6 0.0 FFF%. 21 22 3.7 0.6 0.0 FFF%. 22 23 5.8 1.2 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