SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 25 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 21-27 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.8 0.0 10.2 SSSS XMMMFFFFF% %%%.... 12.2 11.6 6.2 00 01 20.6 0.0 11.0 ASSS XXMMMFFFFF %%%%.... 12.3 12.9 6.6 01 02 20.9 0.0 11.5 ASSS SXXMMFFFFF %%%%.... 12.4 13.7 6.9 02 03 21.0 0.0 11.8 SSS SXXXMFFFFF %%%%.... 12.7 14.2 7.1 03 04 21.1 0.0 11.8 SSS SXXXMFFFFF F%%%.... 12.9 14.3 7.1 04 05 20.6 0.0 11.7 ASSS SXXXMFFFFF %%%%.... 13.0 14.2 7.0 05 06 19.1 0.0 11.3 ASSS SXXMMFFFF% %%%.... 12.1 13.8 6.7 06 07 18.2 0.0 10.7 SSSS XXMMFFFF%% %%.... 11.4 12.8 6.4 07 08 17.9 0.0 9.8 ASSSX XMMMFFF%%% %%.... 11.3 11.3 5.9 08 09 17.7 0.0 8.1 ASSSMM MMMMFFF%%% %%.... 11.2 8.5 5.0 09 10 15.1 0.0 0.0 MMMMMMMMMM MMMFF%%%%% ...... 10.3 0.0 2.5 10 11 12.1 0.0 0.0 XMMMMMMMMM MM%%%%%%.. ..... 8.6 1.8 0.0 11 12 10.9 0.0 0.0 XMMMMMMMMM %%%%%%.... ... 7.8 1.8 0.0 12 13 10.4 0.0 0.0 XMMMMMMMMM %%%%%..... .. 7.3 1.8 0.0 13 14 10.5 0.0 0.0 XMMMMMMMMF %%%%%..... 7.0 1.8 0.0 14 15 10.8 0.0 0.0 XMMMMMMMMF %%%%...... 7.1 1.8 0.0 15 16 10.2 0.0 0.0 XMMMMMMMFF %%%...... 6.8 1.8 0.0 16 17 9.5 0.0 0.0 XMMMMMMMF% %%%.... 6.6 1.8 0.0 17 18 8.3 0.0 0.0 XMMMMMMM%% %.... 6.2 1.8 0.0 18 19 7.4 0.0 0.0 XMMMMMM%%% .... 5.4 1.8 0.0 19 20 6.9 0.0 0.0 XMMMMMM%%. ... 5.2 1.8 0.0 20 21 7.6 0.0 0.0 XMMMMMM%%% .... 5.6 1.8 0.0 21 22 11.7 0.0 5.7 ASMMMMF F%%%%... 7.6 0.0 4.0 22 23 17.5 0.0 8.8 ASSXM MMMFFFF%%% %... 10.8 9.5 5.5 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) 25-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000