SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 17 September, 2025 T-index: 100 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-58 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.0 5.3 3.1 BBFF%%. 00 01 8.6 6.0 3.4 BBBFF%% . 01 02 9.0 6.5 3.6 ABBFF%% .. 02 03 9.3 6.7 3.7 ABBFFF% .. 03 04 9.5 6.8 3.8 ABBFFF% %. 04 05 9.5 6.8 3.8 ABBFFF% %. 05 06 9.1 6.6 3.7 ABBFFF% .. 06 07 8.7 6.2 3.5 ABBFF%% .. 07 08 8.6 5.6 3.2 BBFFF%% . 08 09 8.5 4.7 2.8 ABFFFF%% . 09 10 7.8 2.3 1.5 AFFFFF%%. . 10 11 6.8 0.9 0.0 FFFFFF%%.. 11 12 5.9 0.9 0.0 FFFFF%%.. 12 13 5.4 0.9 0.0 FFFFF%.. 13 14 5.0 0.9 0.0 FFFF%%. 14 15 4.8 0.9 0.0 FFFF%%. 15 16 4.5 0.9 0.0 FFFF%.. 16 17 4.4 0.9 0.0 FFFF%.. 17 18 4.2 0.9 0.0 FFFF%. 18 19 4.0 0.9 0.0 FFF%%. 19 20 3.7 0.9 0.0 FFF%. 20 21 3.6 0.9 0.0 FFF%. 21 22 4.5 0.9 0.0 FFFF%. 22 23 6.7 4.1 2.5 ABFF%.. 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) 17-Sep-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000