SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 15 March, 2026 T-index: 85 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-59 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.8 5.4 3.1 BBF%%. 00 01 7.5 6.0 3.4 BBBF%%. 01 02 7.9 6.4 3.6 ABBF%%. . 02 03 8.3 6.7 3.7 ABBFF%. . 03 04 8.5 6.8 3.7 ABBFF%% . 04 05 8.8 6.7 3.7 ABBFF%% .. 05 06 8.7 6.6 3.6 ABBFF%% .. 06 07 8.4 6.2 3.5 ABBFF%% .. 07 08 8.1 5.7 3.2 BBFFF%% . 08 09 7.9 4.8 2.8 ABFFF%%. . 09 10 7.2 3.1 1.9 ABFFFF%%. . 10 11 6.4 0.9 0.0 FFFFFF%%.. 11 12 5.6 0.9 0.0 FFFFF%%.. 12 13 5.0 0.9 0.0 FFFF%%.. 13 14 4.7 0.9 0.0 FFFF%%. 14 15 4.6 0.9 0.0 FFFF%.. 15 16 4.5 0.9 0.0 FFFF%.. 16 17 4.3 0.9 0.0 FFFF%.. 17 18 4.1 0.9 0.0 FFFF%. 18 19 3.9 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 4.2 0.9 0.0 FFFF%. 22 23 5.9 4.3 2.6 ABF%%. 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) 15-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000