SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 30 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 51-57 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.7 5.2 3.0 ABBFF%%. 00 01 8.5 5.9 3.4 BBFFF%% . 01 02 8.9 6.4 3.6 ABBFF%% .. 02 03 9.4 6.6 3.7 ABBFFF% %. 03 04 9.7 6.8 3.7 ABBFFF% %.. 04 05 9.9 6.7 3.7 ABBFFF% %.. 05 06 9.7 6.5 3.6 ABBFFF% %.. 06 07 9.5 6.2 3.5 ABBFFF% %.. 07 08 9.2 5.6 3.2 BBFFFF% %. 08 09 8.8 4.6 2.7 ABFFFF%% .. 09 10 7.9 1.8 1.3 FFFFFF%%. . 10 11 6.7 0.9 0.0 FFFFFF%%.. 11 12 5.9 0.9 0.0 FFFFF%%.. 12 13 5.3 0.9 0.0 FFFFF%.. 13 14 4.9 0.9 0.0 FFFF%%. 14 15 4.7 0.9 0.0 FFFF%%. 15 16 4.6 0.9 0.0 FFFF%.. 16 17 4.5 0.9 0.0 FFFF%.. 17 18 4.3 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 3.7 0.9 0.0 FFF%. 21 22 4.1 0.9 0.0 FFFF%. 22 23 6.2 4.0 2.4 BBFF%. 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-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000