SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Perth district Date: 1 May, 2025 T-index: 115 Bearings: 0 180 Distance: 0-300 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 60-90 1E 40-90 1 5 10 15 20 25 30 35 40 ** NONE ** UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.9 2.5 2.2 FFFFF%%. 00 01 9.1 3.0 2.5 AFFFFFF% . 01 02 9.8 3.2 2.7 AFFFFFF% %. 02 03 10.2 3.4 2.9 AFFFFFFF %. 03 04 10.2 3.5 2.9 AFFFFFFF %. 04 05 10.3 3.5 2.9 AFFFFFFF %.. 05 06 10.2 3.3 2.8 AFFFFFFF %.. 06 07 10.0 3.1 2.7 AFFFFFF% %.. 07 08 9.7 2.8 2.4 FFFFFFF% %. 08 09 9.3 2.1 1.9 AFFFFFFF% .. 09 10 8.1 0.5 0.0 FFFFFFFF%. 10 11 6.7 0.5 0.0 FFFFFF%.. 11 12 5.8 0.5 0.0 FFFFF%.. 12 13 5.1 0.5 0.0 FFFFF.. 13 14 4.7 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 4.0 0.5 0.0 FFF%%. 18 19 3.9 0.5 0.0 FFF%.. 19 20 3.7 0.5 0.0 FFF%. 20 21 3.4 0.5 0.0 FFF%. 21 22 3.7 0.5 0.0 FFF%. 22 23 5.8 0.0 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