SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 6 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 19.3 0.0 9.8 ASSSX XMMMFFFFF% %%%... 12.2 11.1 6.0 00 01 20.5 0.0 10.6 ASSS XXMMMFFFFF %%%%.... 12.8 12.4 6.5 01 02 20.5 0.0 11.2 ASSS SXXMMFFFFF %%%%.... 12.8 13.3 6.8 02 03 20.2 0.0 11.5 ASSS SXXMMFFFFF %%%%.... 12.8 13.8 6.9 03 04 19.8 0.0 11.5 ASSS SXXMMFFFF% %%%..... 12.8 14.0 6.9 04 05 19.3 0.0 11.4 ASSS SXXMMFFFF% %%%.... 12.7 13.8 6.8 05 06 18.2 0.0 11.0 ASSS XXXMFFFF%% %%.... 12.2 13.4 6.6 06 07 17.6 0.0 10.4 SSSS XXMMFFF%%% %%.... 11.8 12.5 6.2 07 08 17.4 0.0 9.3 ASSSX MMMMFFF%%% %..... 11.7 10.8 5.6 08 09 17.0 0.0 7.4 ASSMMM MMMMFF%%%% %.... 11.4 7.7 4.6 09 10 14.2 0.0 0.0 XMMMMMMMMM MMFF%%%%%. ..... 9.9 1.8 0.0 10 11 11.1 0.0 0.0 XMMMMMMMMM F%%%%%.... .. 8.1 1.8 0.0 11 12 9.9 0.0 0.0 XMMMMMMMM% %%%%...... 7.3 1.8 0.0 12 13 9.4 0.0 0.0 XMMMMMMMM% %%%...... 6.8 1.8 0.0 13 14 9.3 0.0 0.0 XMMMMMMMF% %%%..... 6.6 1.8 0.0 14 15 9.5 0.0 0.0 XMMMMMMMF% %%%.... 6.5 1.8 0.0 15 16 9.0 0.0 0.0 XMMMMMMM%% %%..... 6.4 1.8 0.0 16 17 8.5 0.0 0.0 XMMMMMMF%% %..... 6.2 1.8 0.0 17 18 7.6 0.0 0.0 XMMMMMM%%% .... 5.8 1.8 0.0 18 19 6.8 0.0 0.0 XMMMMM%%%. ... 5.0 1.8 0.0 19 20 6.2 0.0 0.0 XMMMMM%%%. .. 4.5 1.8 0.0 20 21 6.3 0.0 0.0 XMMMMM%%%. .. 4.9 1.8 0.0 21 22 9.7 0.0 0.0 MMMMMMMMF% %%.... 6.4 0.0 3.4 22 23 16.5 0.0 8.3 SSSMM MMFFFF%%%. ... 10.3 8.6 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) 6-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000