SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 14 September, 2026 T-index: 65 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 19.7 0.0 9.9 SSSX XMMMFFFFF% %%%.... 12.3 11.3 6.1 00 01 20.8 0.0 10.8 ASSS XXMMMFFFFF %%%%.... 12.7 12.6 6.5 01 02 21.0 0.0 11.3 ASSS SXXMMFFFFF %%%%.... 12.6 13.5 6.8 02 03 20.9 0.0 11.6 ASSS SXXMMFFFFF %%%%.... 12.6 13.9 6.9 03 04 20.6 0.0 11.6 ASSS SXXXMFFFFF %%%%.... 12.8 14.1 7.0 04 05 20.1 0.0 11.5 ASSS SXXMMFFFFF %%%.... 12.7 14.0 6.9 05 06 18.7 0.0 11.1 ASSS SXXMFFFF%% %%.... 11.9 13.5 6.6 06 07 17.8 0.0 10.5 SSSS XXMMFFF%%% %%.... 11.5 12.6 6.3 07 08 17.6 0.0 9.5 ASSSX MMMMFFF%%% %%.... 11.5 11.0 5.7 08 09 17.2 0.0 7.7 ASSMMM MMMMFFF%%% %.... 11.2 8.0 4.8 09 10 14.4 0.0 0.0 XMMMMMMMMM MMMF%%%%%. ..... 9.9 1.8 0.0 10 11 11.2 0.0 0.0 XMMMMMMMMM M%%%%%.... ... 8.2 1.8 0.0 11 12 10.1 0.0 0.0 XMMMMMMMMM %%%%%..... . 7.5 1.8 0.0 12 13 9.5 0.0 0.0 XMMMMMMMM% %%%%...... 7.0 1.8 0.0 13 14 9.6 0.0 0.0 XMMMMMMMF% %%%...... 6.8 1.8 0.0 14 15 10.0 0.0 0.0 XMMMMMMMF% %%%..... 6.6 1.8 0.0 15 16 9.4 0.0 0.0 XMMMMMMMF% %%..... 6.5 1.8 0.0 16 17 8.8 0.0 0.0 XMMMMMMM%% %%.... 6.3 1.8 0.0 17 18 7.8 0.0 0.0 XMMMMMM%%% .... 5.9 1.8 0.0 18 19 7.0 0.0 0.0 XMMMMM%%%% ... 5.1 1.8 0.0 19 20 6.4 0.0 0.0 XMMMMM%%%. .. 4.7 1.8 0.0 20 21 6.6 0.0 0.0 XMMMMM%%%. ... 5.2 1.8 0.0 21 22 10.3 0.0 4.4 AMMMMFF %%%.... 6.8 0.0 3.7 22 23 16.9 0.0 8.5 SSSMM MMFFFF%%%% ... 10.5 9.0 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) 14-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000