SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 1 May, 2025 T-index: 115 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 8.8 4.7 2.8 ABFFFF%% . 00 01 10.2 5.6 3.2 BBFFFFF %.. 01 02 10.9 6.2 3.5 ABBFFFF %%.. 02 03 11.2 6.5 3.6 ABBFFFF F%.. 03 04 11.2 6.6 3.7 ABBFFFF F%.. 04 05 11.3 6.6 3.7 ABBFFFF F%.. 05 06 11.2 6.3 3.6 ABBFFFF F%.. 06 07 11.1 5.9 3.4 BBFFFFF F%.. 07 08 10.8 5.2 3.0 ABBFFFFF %%.. 08 09 10.2 3.8 2.3 BFFFFFFF %.. 09 10 8.8 1.0 0.0 BFFFFFFF%% .. 10 11 7.2 1.0 0.0 BFFFFFF%.. 11 12 6.1 1.0 0.0 BFFFFF%. 12 13 5.3 1.0 0.0 BFFFF%. 13 14 4.9 1.0 0.0 BFFF%.. 14 15 4.6 1.0 0.0 BFFF%.. 15 16 4.5 1.0 0.0 BFFF%.. 16 17 4.4 1.0 0.0 BFFF%. 17 18 4.2 1.0 0.0 BFFF%. 18 19 4.1 1.0 0.0 BFFF%. 19 20 3.8 1.0 0.0 BFF%.. 20 21 3.6 1.0 0.0 BFF%. 21 22 3.8 1.0 0.0 BFF%. 22 23 6.3 2.3 1.5 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) 1-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000