SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 17 September, 2026 T-index: 55 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-10 1E 0 1 5 10 15 20 25 30 35 40 2F 21-26 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 18.8 0.0 9.8 ASSSX XMMMFFFF%% %%.... 11.7 11.2 6.0 00 01 19.9 0.0 10.6 SSSS XXMMFFFFF% %%%.... 12.1 12.5 6.4 01 02 19.8 0.0 11.1 ASSS SXXMFFFFF% %%%.... 11.9 13.3 6.7 02 03 19.9 0.0 11.4 ASSS SXXMFFFFF% %%%.... 12.0 13.8 6.8 03 04 19.7 0.0 11.4 ASSS SXXMMFFFF% %%%.... 12.2 14.0 6.9 04 05 19.2 0.0 11.3 ASSS SXXMFFFFF% %%.... 12.1 13.8 6.7 05 06 18.1 0.0 11.0 ASSS XXXMFFFF%% %%... 11.5 13.4 6.5 06 07 17.3 0.0 10.3 SSSS XXMFFFF%%% %.... 11.1 12.5 6.2 07 08 17.1 0.0 9.4 ASSSX MMMFFFF%%% %.... 11.0 10.9 5.7 08 09 16.6 0.0 7.6 ASSXMM MMMFFF%%%% .... 10.8 8.1 4.8 09 10 13.8 0.0 0.0 XMMMMMMMMM MMF%%%%%.. .... 9.6 1.7 0.0 10 11 10.8 0.0 0.0 XMMMMMMMMM M%%%%%.... .. 7.9 1.7 0.0 11 12 9.7 0.0 0.0 XMMMMMMMM% %%%%...... 7.3 1.7 0.0 12 13 9.2 0.0 0.0 XMMMMMMMM% %%%...... 6.8 1.7 0.0 13 14 9.2 0.0 0.0 XMMMMMMMF% %%%..... 6.6 1.7 0.0 14 15 9.8 0.0 0.0 XMMMMMMMF% %%%.... 6.5 1.7 0.0 15 16 9.3 0.0 0.0 XMMMMMMMF% %%..... 6.3 1.7 0.0 16 17 8.7 0.0 0.0 XMMMMMMF%% %..... 6.1 1.7 0.0 17 18 7.6 0.0 0.0 XMMMMMM%%% .... 5.8 1.7 0.0 18 19 6.8 0.0 0.0 XMMMMM%%%. ... 4.9 1.7 0.0 19 20 6.3 0.0 0.0 XMMMMM%%.. .. 4.6 1.7 0.0 20 21 6.7 0.0 0.0 XMMMMM%%%. .. 5.2 1.7 0.0 21 22 10.3 0.0 4.8 AMMMMFF %%%... 6.9 0.0 3.7 22 23 16.3 0.0 8.4 SSSMM MMFFFF%%%. .. 10.2 9.0 5.2 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) 17-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000