SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 1 March, 2026 T-index: 95 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-61 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.5 5.6 3.2 BBF%%. 00 01 7.1 6.2 3.5 ABBF%.. 01 02 7.4 6.6 3.7 ABBF%%. 02 03 7.9 6.8 3.8 ABBF%%. . 03 04 8.1 6.9 3.9 ABBFF%. . 04 05 8.3 6.9 3.8 ABBFF%% .. 05 06 8.3 6.7 3.8 ABBFF%% .. 06 07 8.1 6.4 3.6 ABBFF%% . 07 08 7.9 5.9 3.4 BBFF%%. . 08 09 7.7 5.1 3.0 ABBFF%%. . 09 10 7.3 3.7 2.3 BFFFF%%. 10 11 6.8 0.9 0.0 FFFFFF%%.. 11 12 6.2 0.9 0.0 FFFFFF%.. 12 13 5.7 0.9 0.0 FFFFF%%. 13 14 5.2 0.9 0.0 FFFFF%.. 14 15 5.0 0.9 0.0 FFFF%%. 15 16 4.9 0.9 0.0 FFFF%%. 16 17 4.7 0.9 0.0 FFFF%.. 17 18 4.4 0.9 0.0 FFFF%. 18 19 4.1 0.9 0.0 FFFF%. 19 20 3.9 0.9 0.0 FFF%.. 20 21 3.8 0.9 0.0 FFF%.. 21 22 4.4 2.4 1.6 AFF%. 22 23 5.7 4.7 2.8 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) 1-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000