SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 13 June, 2026 T-index: 75 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 50-53 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.4 3.9 2.3 BFFF%. 00 01 7.5 5.0 2.8 ABBFF%.. 01 02 8.1 5.6 3.1 BBFFF%. . 02 03 8.3 5.9 3.2 BBFFF%. . 03 04 8.3 6.1 3.3 BBBFF%. . 04 05 8.4 6.0 3.3 BBBFF%. . 05 06 8.5 5.8 3.2 BBFFF%% . 06 07 8.6 5.3 2.9 ABBFFF%% .. 07 08 8.3 4.5 2.6 ABFFFF%. . 08 09 7.4 2.3 1.4 BFFFFF%.. 09 10 5.6 0.9 0.0 FFFFF%.. 10 11 4.2 0.9 0.0 FFFF%.. 11 12 3.5 0.9 0.0 FFF%.. 12 13 3.3 0.9 0.0 FFF%. 13 14 3.1 0.9 0.0 FFF%. 14 15 3.1 0.9 0.0 FFF%. 15 16 3.1 0.9 0.0 FFF%. 16 17 3.1 0.9 0.0 FFF%. 17 18 3.2 0.9 0.0 FFF%. 18 19 3.3 0.9 0.0 FFF%. 19 20 3.3 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 4.2 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) 13-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000