SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 24 February, 2026 T-index: 60 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-11 1E 0 1 5 10 15 20 25 30 35 40 2F 21-28 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.4 0.0 10.2 SSSX XMFFF%%%%. .. 9.9 11.9 6.2 00 01 16.7 0.0 11.0 ASSS XXMFFF%%%% .... 10.3 13.0 6.6 01 02 17.6 0.0 11.5 ASSS XXXFFFF%%% %.... 10.6 13.8 6.9 02 03 18.6 0.0 11.7 ASSS SXXXFFFF%% %%..... 11.1 14.2 7.0 03 04 18.9 0.0 11.8 ASSS SXXXFFFF%% %%%.... 11.3 14.4 7.0 04 05 19.4 0.0 11.6 ASSS SXXXFFFFF% %%%..... 11.5 14.2 6.9 05 06 19.1 0.0 11.3 ASSS SXXMFFFFF% %%%...... 11.5 13.8 6.7 06 07 18.6 0.0 10.7 SSSS XXMMFFFF%% %%%...... 11.3 12.9 6.4 07 08 17.9 0.0 9.9 ASSSX XMMMFFF%%% %%%..... 11.1 11.5 6.0 08 09 17.0 0.0 8.4 SSSXM MMMFFF%%%% %..... 10.8 9.1 5.3 09 10 15.1 0.0 4.6 AMMMMMM MMMFF%%%%% ...... 10.1 0.0 3.8 10 11 12.9 0.0 0.0 XMMMMMMMMM MM%%%%%%.. .... 9.0 1.8 0.0 11 12 11.4 0.0 0.0 XMMMMMMMMM F%%%%%.... . 8.1 1.8 0.0 12 13 10.6 0.0 0.0 XMMMMMMMMF %%%%%..... 7.4 1.8 0.0 13 14 10.2 0.0 0.0 XMMMMMMMMF %%%%.... 6.9 1.8 0.0 14 15 10.7 0.0 0.0 XMMMMMMMMF %%%%.... 7.0 1.8 0.0 15 16 10.6 0.0 0.0 XMMMMMMMFF %%%%.... 6.9 1.8 0.0 16 17 10.4 0.0 0.0 XMMMMMMMFF %%%..... 6.9 1.8 0.0 17 18 9.0 0.0 0.0 XMMMMMMM%% %%.... 6.6 1.8 0.0 18 19 8.0 0.0 0.0 XMMMMMM%%% %..... 6.1 1.8 0.0 19 20 7.0 0.0 0.0 XMMMMMM%%% .... 5.4 1.8 0.0 20 21 6.9 0.0 0.0 XMMMMM%%%% .... 5.5 1.8 0.0 21 22 10.0 0.0 6.8 SSMMF% %%%.... 6.9 6.5 4.4 22 23 13.9 0.0 9.1 ASSXX MFF%%%%... 8.9 10.1 5.5 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) 24-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000