SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 20 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 21-26 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.2 0.0 9.9 SSSX XMMMFFFFF% %%%... 11.9 11.3 6.1 00 01 20.1 0.0 10.7 ASSS XXMMFFFFFF %%%%... 12.2 12.6 6.5 01 02 20.1 0.0 11.2 ASSS SXXMFFFFFF %%%%... 12.2 13.5 6.8 02 03 20.2 0.0 11.5 ASSS SXXMFFFFFF %%%.... 12.3 13.9 6.9 03 04 20.1 0.0 11.6 ASSS SXXXMFFFFF %%%.... 12.5 14.1 6.9 04 05 19.6 0.0 11.4 ASSS SXXMMFFFF% %%%.... 12.5 14.0 6.8 05 06 18.5 0.0 11.1 ASSS SXXMFFFF%% %%.... 11.7 13.5 6.6 06 07 17.8 0.0 10.5 SSSS XXMMFFF%%% %..... 11.2 12.6 6.3 07 08 17.5 0.0 9.5 ASSSX MMMMFFF%%% %.... 11.2 11.0 5.7 08 09 17.1 0.0 7.8 ASSXMM MMMFFFF%%% %.... 11.0 8.2 4.9 09 10 14.3 0.0 0.0 XMMMMMMMMM MMMF%%%%%. ..... 9.9 1.8 1.0 10 11 11.3 0.0 0.0 XMMMMMMMMM M%%%%%.... ... 8.2 1.8 0.0 11 12 10.2 0.0 0.0 XMMMMMMMMM %%%%%..... . 7.5 1.8 0.0 12 13 9.6 0.0 0.0 XMMMMMMMM% %%%%...... 7.0 1.8 0.0 13 14 9.7 0.0 0.0 XMMMMMMMF% %%%...... 6.8 1.8 0.0 14 15 10.2 0.0 0.0 XMMMMMMMFF %%%..... 6.7 1.8 0.0 15 16 9.7 0.0 0.0 XMMMMMMMF% %%%.... 6.5 1.8 0.0 16 17 9.0 0.0 0.0 XMMMMMMM%% %%.... 6.3 1.8 0.0 17 18 7.9 0.0 0.0 XMMMMMM%%% .... 5.9 1.8 0.0 18 19 7.1 0.0 0.0 XMMMMMF%%. ... 5.1 1.8 0.0 19 20 6.5 0.0 0.0 XMMMMM%%%. .. 4.8 1.8 0.0 20 21 7.0 0.0 0.0 XMMMMM%%%. ... 5.3 1.8 0.0 21 22 10.9 0.0 5.1 ASMMMFF %%%%... 7.1 0.0 3.8 22 23 16.7 0.0 8.5 SSSXM MMFFFF%%%% ... 10.4 9.2 5.3 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) 20-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000