SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Karratha Perth Date: 26 January, 2026 T-index: 125 Bearings: 184 5 Distance: 1251 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 19-30 1E 5 1 5 10 15 20 25 30 35 40 2F 37-50 2E 14 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 10.8 13.8 7.4 ASSXMB PPP... 7.7 8.6 4.5 00 01 11.4 15.2 8.0 ASSXXM BPPEE.. 8.2 9.4 4.8 01 02 11.9 16.0 8.4 SSSXM BPPPEE.. 8.6 10.0 5.1 02 03 12.4 16.6 8.6 SSSXX MBPPPE.. 9.0 10.3 5.2 03 04 12.7 16.8 8.7 SSSXX MBPPPE... 9.2 10.5 5.3 04 05 13.0 16.7 8.7 SSSXX MBPPPP... 9.4 10.4 5.3 05 06 13.2 16.3 8.5 SSSXX MBBPPP... 9.4 10.2 5.2 06 07 12.6 15.6 8.2 ASSSXM MBPPP%... 9.0 9.8 5.0 07 08 12.1 14.5 7.7 ASSXXM MBPP%... 8.7 9.1 4.7 08 09 11.7 12.9 7.0 SSXXMM BP%%... 8.4 8.1 4.3 09 10 11.7 10.3 5.8 ASXMMMM F%%%... 8.3 6.3 3.6 10 11 11.7 2.3 0.0 XMMMMMMMMM F%%%.. 8.4 1.4 0.0 11 12 11.2 2.3 0.0 XMMMMMMMMF F%%.. 8.1 1.4 0.0 12 13 10.8 2.3 0.0 XMMMMMMMMF %%%.. 8.0 1.4 0.0 13 14 10.0 2.3 0.0 XMMMMMMMM% %%.. 7.4 1.4 0.0 14 15 9.7 2.3 0.0 XMMMMMMMF% %%.. 7.1 1.4 0.0 15 16 9.7 2.3 0.0 XMMMMMMMF% %%.. 6.9 1.4 0.0 16 17 9.4 2.3 0.0 XMMMMMMMF% %.. 6.8 1.4 0.0 17 18 8.3 2.3 0.0 XMMMMMMF%% .. 6.0 1.4 0.0 18 19 7.5 2.3 0.0 XMMMMMM%%% . 5.5 1.4 0.0 19 20 6.7 2.3 0.0 XMMMMM%%.. 5.0 1.4 0.0 20 21 6.3 2.3 0.0 XMMMMM%%. 4.9 1.4 0.0 21 22 7.9 8.1 4.8 ASMMMP%% .. 5.8 4.9 3.0 22 23 10.0 11.8 6.5 ASSXMBP P%... 7.1 7.4 4.0 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) 26-Jan-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000