SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Perth district Date: 25 January, 2025 T-index: 100 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 5.6 3.1 2.7 AFF%.. 00 01 5.9 3.4 2.9 AFF%%.. 01 02 6.3 3.5 3.0 AFFF%.. 02 03 6.7 3.7 3.1 FFF%%.. 03 04 6.9 3.7 3.1 FFF%%.. 04 05 7.0 3.7 3.1 FFF%%.. 05 06 6.9 3.6 3.0 AFFF%%.. 06 07 6.7 3.5 2.9 AFFF%%.. 07 08 6.5 3.2 2.8 AFFF%%. 08 09 6.3 2.9 2.5 AFFF%.. 09 10 6.0 2.4 2.2 FFF%%.. 10 11 6.0 0.0 1.2 FFFF%%. 11 12 5.8 0.5 0.0 FFFFF%%. 12 13 5.7 0.5 0.0 FFFFF%%. 13 14 5.4 0.5 0.0 FFFFF%.. 14 15 5.2 0.5 0.0 FFFFF%. 15 16 5.0 0.5 0.0 FFFF%%. 16 17 4.8 0.5 0.0 FFFF%%. 17 18 4.4 0.5 0.0 FFFF%. 18 19 4.1 0.5 0.0 FFFF%. 19 20 3.9 0.5 0.0 FFF%.. 20 21 3.8 0.5 0.0 FFF%. 21 22 4.3 1.9 1.8 AFF%. 22 23 5.0 2.7 2.3 FF%%. 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) 25-Jan-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000