SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 27 April, 2025 T-index: 125 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-56 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.4 4.9 2.9 ABFFFFF% . 00 01 10.7 5.8 3.3 BBFFFFF %%. 01 02 11.4 6.3 3.6 ABBFFFF F%.. 02 03 11.7 6.6 3.7 ABBFFFF F%%. 03 04 11.7 6.7 3.8 ABBFFFF F%%. 04 05 11.8 6.7 3.8 ABBFFFF F%%. 05 06 11.7 6.4 3.6 ABBFFFF F%%. 06 07 11.6 6.0 3.4 BBBFFFF F%%. 07 08 11.3 5.3 3.1 BBFFFFF F%%. 08 09 10.8 4.0 2.4 BBFFFFFF %%. 09 10 9.5 1.0 0.0 BFFFFFFFF% %. 10 11 7.9 1.0 0.0 BFFFFFF%%. 11 12 6.8 1.0 0.0 BFFFFF%.. 12 13 5.9 1.0 0.0 BFFFF%. 13 14 5.4 1.0 0.0 BFFFF%. 14 15 5.0 1.0 0.0 BFFF%%. 15 16 4.8 1.0 0.0 BFFF%.. 16 17 4.7 1.0 0.0 BFFF%.. 17 18 4.5 1.0 0.0 BFFF%.. 18 19 4.4 1.0 0.0 BFFF%. 19 20 4.1 1.0 0.0 BFFF%. 20 21 3.8 1.0 0.0 BFF%.. 21 22 4.1 1.0 0.0 BFFF. 22 23 6.8 2.7 1.8 AFFFF%. 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) 27-Apr-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000