SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 3 September, 2026 T-index: 70 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 19.5 0.0 9.8 ASSSX MMMMFFFFF% %%%.... 12.3 11.0 6.0 00 01 20.9 0.0 10.7 ASSS XXMMMFFFFF %%%%%.... 13.0 12.5 6.5 01 02 20.9 0.0 11.2 ASSS SXXMMFFFFF %%%%%.... 13.0 13.3 6.8 02 03 20.9 0.0 11.5 ASSS SXXMMFFFFF %%%%..... 13.0 13.8 6.9 03 04 20.3 0.0 11.6 ASSS SXXMMFFFFF %%%%.... 13.0 14.0 7.0 04 05 19.8 0.0 11.5 ASSS SXXMMFFFF% %%%..... 12.9 13.9 6.8 05 06 18.8 0.0 11.1 ASSS SXXMMFFF%% %%..... 12.4 13.4 6.6 06 07 17.9 0.0 10.4 SSSS XXMMFFF%%% %%..... 12.0 12.5 6.2 07 08 17.7 0.0 9.4 ASSSX MMMMFFF%%% %%..... 11.9 10.8 5.6 08 09 17.4 0.0 7.4 ASSMMM MMMMFFF%%% %..... 11.6 7.6 4.6 09 10 14.5 0.0 0.0 XMMMMMMMMM MMMF%%%%%. ..... 10.0 1.8 0.0 10 11 11.4 0.0 0.0 XMMMMMMMMM M%%%%%.... ... 8.3 1.8 0.0 11 12 10.2 0.0 0.0 XMMMMMMMMF %%%%...... 7.5 1.8 0.0 12 13 9.5 0.0 0.0 XMMMMMMMM% %%%...... 6.9 1.8 0.0 13 14 9.4 0.0 0.0 XMMMMMMMF% %%%..... 6.7 1.8 0.0 14 15 9.6 0.0 0.0 XMMMMMMMF% %%%.... 6.5 1.8 0.0 15 16 9.1 0.0 0.0 XMMMMMMMF% %%..... 6.4 1.8 0.0 16 17 8.6 0.0 0.0 XMMMMMMF%% %..... 6.2 1.8 0.0 17 18 7.7 0.0 0.0 XMMMMMM%%% %.... 5.8 1.8 0.0 18 19 7.0 0.0 0.0 XMMMMM%%%% .... 5.1 1.8 0.0 19 20 6.3 0.0 0.0 XMMMMM%%%. .. 4.6 1.8 0.0 20 21 6.3 0.0 0.0 XMMMMM%%%. .. 5.0 1.8 0.0 21 22 9.6 0.0 0.0 MMMMMMMFF% %%.... 6.3 0.0 3.4 22 23 16.7 0.0 8.3 SSSMM MMFFFF%%%% ... 10.4 8.5 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) 3-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000