SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 10 September, 2026 T-index: 55 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 18.6 0.0 9.7 ASSSX MMMMFFFF%% %%.... 11.8 11.0 5.9 00 01 19.8 0.0 10.5 SSSS XXMMFFFFF% %%%.... 12.3 12.4 6.4 01 02 19.8 0.0 11.0 ASSS XXXMFFFFF% %%%.... 12.1 13.2 6.7 02 03 19.5 0.0 11.3 ASSS SXXMFFFFF% %%%.... 12.0 13.7 6.8 03 04 19.2 0.0 11.4 ASSS SXXMFFFFF% %%%.... 12.1 13.9 6.8 04 05 18.7 0.0 11.2 ASSS SXXMFFFF%% %%.... 12.0 13.7 6.7 05 06 17.7 0.0 10.9 ASSS XXXMFFF%%% %.... 11.5 13.3 6.5 06 07 17.0 0.0 10.2 SSSS XXMFFF%%%% %.... 11.2 12.4 6.1 07 08 16.7 0.0 9.2 ASSSX MMMFFF%%%% ..... 11.1 10.8 5.6 08 09 16.2 0.0 7.4 ASSMMM MMMFFF%%%% .... 10.8 7.8 4.6 09 10 13.4 0.0 0.0 XMMMMMMMMM MMF%%%%%.. ... 9.4 1.7 0.0 10 11 10.6 0.0 0.0 XMMMMMMMMM %%%%%..... .. 7.8 1.7 0.0 11 12 9.5 0.0 0.0 XMMMMMMMM% %%%%..... 7.1 1.7 0.0 12 13 9.0 0.0 0.0 XMMMMMMM%% %%%..... 6.6 1.7 0.0 13 14 9.0 0.0 0.0 XMMMMMMM%% %%..... 6.5 1.7 0.0 14 15 9.4 0.0 0.0 XMMMMMMMF% %%..... 6.4 1.7 0.0 15 16 9.0 0.0 0.0 XMMMMMMM%% %%.... 6.3 1.7 0.0 16 17 8.5 0.0 0.0 XMMMMMMF%% %.... 6.1 1.7 0.0 17 18 7.4 0.0 0.0 XMMMMMM%%% .... 5.6 1.7 0.0 18 19 6.7 0.0 0.0 XMMMMM%%%. ... 4.8 1.7 0.0 19 20 6.1 0.0 0.0 XMMMMM%%.. .. 4.4 1.7 0.0 20 21 6.3 0.0 0.0 XMMMMM%%%. .. 4.9 1.7 0.0 21 22 9.6 0.0 3.5 AMMMMF% %%.... 6.5 0.0 3.5 22 23 16.0 0.0 8.2 SSSMM MMFFF%%%%. .. 10.1 8.7 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) 10-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000