SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 13 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 20.0 0.0 10.0 SSSX XMMMMFFFF% %%%%... 12.5 11.3 6.1 00 01 21.2 0.0 10.8 ASSS XXMMMFFFFF F%%%%.... 12.9 12.7 6.6 01 02 21.3 0.0 11.4 ASSS SXXMMFFFFF F%%%%.... 12.9 13.5 6.9 02 03 21.2 0.0 11.6 ASSS SXXMMFFFFF F%%%.... 13.0 14.0 7.0 03 04 20.9 0.0 11.7 ASSS SXXXMFFFFF %%%%.... 13.1 14.2 7.0 04 05 20.3 0.0 11.6 ASSS SXXMMFFFFF %%%.... 13.0 14.0 6.9 05 06 19.0 0.0 11.2 ASSS SXXMMFFF%% %%%.... 12.2 13.6 6.7 06 07 18.1 0.0 10.6 SSSS XXMMFFFF%% %%..... 11.7 12.6 6.3 07 08 18.0 0.0 9.5 ASSSX MMMMFFF%%% %%.... 11.7 11.0 5.8 08 09 17.5 0.0 7.7 ASSMMM MMMMFFF%%% %..... 11.4 8.0 4.8 09 10 14.7 0.0 0.0 XMMMMMMMMM MMMF%%%%%% ...... 10.1 1.8 0.0 10 11 11.6 0.0 0.0 XMMMMMMMMM M%%%%%%... .... 8.4 1.8 0.0 11 12 10.4 0.0 0.0 XMMMMMMMMM %%%%%..... . 7.6 1.8 0.0 12 13 9.9 0.0 0.0 XMMMMMMMM% %%%%...... 7.1 1.8 0.0 13 14 9.8 0.0 0.0 XMMMMMMMM% %%%%..... 6.9 1.8 0.0 14 15 10.2 0.0 0.0 XMMMMMMMFF %%%...... 6.7 1.8 0.0 15 16 9.6 0.0 0.0 XMMMMMMMF% %%%..... 6.6 1.8 0.0 16 17 8.9 0.0 0.0 XMMMMMMM%% %%.... 6.4 1.8 0.0 17 18 7.9 0.0 0.0 XMMMMMM%%% %.... 6.0 1.8 0.0 18 19 7.1 0.0 0.0 XMMMMMM%%% ... 5.1 1.8 0.0 19 20 6.5 0.0 0.0 XMMMMM%%%. .. 4.8 1.8 0.0 20 21 6.8 0.0 0.0 XMMMMM%%%. ... 5.2 1.8 0.0 21 22 10.5 0.0 4.3 AMMMMFF %%%.... 6.9 0.0 3.7 22 23 17.1 0.0 8.5 SSSMM MMMFFFF%%% ... 10.7 9.0 5.4 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) 13-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000