SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 6 April, 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 51-56 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.6 5.1 2.9 ABBFF%%. 00 01 8.4 5.8 3.3 BBFFF%% . 01 02 8.8 6.2 3.5 ABBFF%% .. 02 03 9.2 6.5 3.6 ABBFFF% .. 03 04 9.5 6.6 3.6 ABBFFF% %.. 04 05 9.7 6.6 3.6 ABBFFF% %.. 05 06 9.5 6.4 3.5 ABBFFF% %.. 06 07 9.1 6.0 3.4 BBBFFF% %.. 07 08 8.9 5.4 3.1 BBFFF%% %. 08 09 8.5 4.4 2.6 ABFFFF%% .. 09 10 7.3 0.9 0.0 FFFFFFF%%. . 10 11 6.0 0.9 0.0 FFFFF%%%. 11 12 5.3 0.9 0.0 FFFFF%%. 12 13 4.8 0.9 0.0 FFFF%%. 13 14 4.5 0.9 0.0 FFFF%.. 14 15 4.4 0.9 0.0 FFFF%.. 15 16 4.3 0.9 0.0 FFFF%.. 16 17 4.2 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 3.5 0.9 0.0 FFF%. 21 22 3.8 0.9 0.0 FFF%. 22 23 5.9 3.7 2.2 BFF%%. 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) 6-Apr-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000