SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 28 September, 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 7-10 1E 0 1 5 10 15 20 25 30 35 40 2F 21-27 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 18.9 0.0 10.0 SSSX XMMMFFFF%% %%.... 11.6 11.5 6.1 00 01 19.7 0.0 10.8 ASSS XXMMFFFFF% %%%.... 11.8 12.8 6.5 01 02 19.7 0.0 11.3 ASSS SXXMFFFFF% %%%.... 11.9 13.6 6.8 02 03 20.0 0.0 11.6 ASSS SXXMFFFFF% %%%.... 12.0 14.0 6.9 03 04 20.2 0.0 11.6 ASSS SXXXMFFFFF %%%.... 12.3 14.2 7.0 04 05 19.8 0.0 11.5 ASSS SXXXMFFFF% %%%.... 12.4 14.1 6.9 05 06 18.6 0.0 11.2 ASSS SXXMFFFF%% %%.... 11.7 13.6 6.6 06 07 17.8 0.0 10.6 SSSS XXMMFFF%%% %..... 11.1 12.7 6.3 07 08 17.4 0.0 9.6 ASSSX XMMFFFF%%% %.... 11.0 11.2 5.8 08 09 17.3 0.0 8.0 ASSXMM MMMFFFF%%% %.... 11.0 8.5 5.0 09 10 14.5 0.0 0.0 MMMMMMMMMM MMMF%%%%%. ..... 10.1 0.0 2.8 10 11 11.7 0.0 0.0 XMMMMMMMMM M%%%%%%... .... 8.4 1.8 0.0 11 12 10.5 0.0 0.0 XMMMMMMMMM %%%%%..... .. 7.7 1.8 0.0 12 13 10.0 0.0 0.0 XMMMMMMMM% %%%%%..... . 7.1 1.8 0.0 13 14 10.0 0.0 0.0 XMMMMMMMM% %%%%..... 6.9 1.8 0.0 14 15 10.5 0.0 0.0 XMMMMMMMFF %%%%..... 6.9 1.8 0.0 15 16 10.0 0.0 0.0 XMMMMMMMF% %%%..... 6.6 1.8 0.0 16 17 9.3 0.0 0.0 XMMMMMMMF% %%..... 6.4 1.8 0.0 17 18 8.1 0.0 0.0 XMMMMMMF%% %.... 6.1 1.8 0.0 18 19 7.2 0.0 0.0 XMMMMMM%%% ... 5.3 1.8 0.0 19 20 6.8 0.0 0.0 XMMMMM%%%. ... 5.1 1.8 0.0 20 21 7.6 0.0 0.0 XMMMMMM%%% .... 5.5 1.8 0.0 21 22 11.6 0.0 5.8 ASMMMMF F%%%%... 7.5 0.0 4.0 22 23 16.9 0.0 8.7 SSSXM MMFFFF%%%% ... 10.4 9.5 5.4 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) 28-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000