SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 23 March, 2026 T-index: 80 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-58 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.0 5.2 3.0 ABBF%%. 00 01 7.7 5.9 3.3 BBFF%%. 01 02 8.0 6.3 3.5 ABBF%%. . 02 03 8.4 6.6 3.6 ABBFF%% . 03 04 8.6 6.7 3.7 ABBFF%% .. 04 05 8.8 6.7 3.7 ABBFF%% .. 05 06 8.7 6.5 3.6 ABBFF%% .. 06 07 8.4 6.1 3.4 BBBFF%% .. 07 08 8.1 5.6 3.2 BBFFF%% . 08 09 7.8 4.7 2.7 ABFFF%%. . 09 10 7.0 2.6 1.7 AFFFF%%%. . 10 11 5.9 0.9 0.0 FFFFF%%%.. 11 12 5.2 0.9 0.0 FFFFF%%.. 12 13 4.7 0.9 0.0 FFFF%%.. 13 14 4.4 0.9 0.0 FFFF%.. 14 15 4.3 0.9 0.0 FFFF%.. 15 16 4.3 0.9 0.0 FFFF%.. 16 17 4.1 0.9 0.0 FFFF%. 17 18 4.0 0.9 0.0 FFF%%. 18 19 3.8 0.9 0.0 FFF%%. 19 20 3.6 0.9 0.0 FFF%. 20 21 3.5 0.9 0.0 FFF%. 21 22 4.0 0.9 0.0 FFF%%. 22 23 5.8 4.1 2.4 BBF%.. 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) 23-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000