SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 30 June, 2025 T-index: 85 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-54 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.5 4.0 2.3 BBFF%. 00 01 7.8 5.1 2.9 ABBFF%%. 01 02 8.3 5.7 3.1 BBFFF%. . 02 03 8.5 6.0 3.3 BBBFF%. . 03 04 8.6 6.1 3.3 BBBFF%. . 04 05 8.6 6.1 3.3 BBBFF%% . 05 06 8.7 5.8 3.2 BBFFF%% . 06 07 8.7 5.4 3.0 ABBFFF%% .. 07 08 8.5 4.5 2.6 ABFFFF%. . 08 09 7.7 2.3 1.5 AFFFFF%.. 09 10 6.0 0.9 0.0 FFFFF%%.. 10 11 4.5 0.9 0.0 FFFF%.. 11 12 3.8 0.9 0.0 FFF%.. 12 13 3.5 0.9 0.0 FFF%. 13 14 3.2 0.9 0.0 FFF%. 14 15 3.2 0.9 0.0 FFF%. 15 16 3.2 0.9 0.0 FFF%. 16 17 3.2 0.9 0.0 FFF%. 17 18 3.1 0.9 0.0 FFF%. 18 19 3.2 0.9 0.0 FFF%. 19 20 3.2 0.9 0.0 FFF%. 20 21 3.1 0.9 0.0 FFF%. 21 22 3.1 0.9 0.0 FFF. 22 23 4.4 0.9 0.0 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) 30-Jun-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000