SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 18 October, 2026 T-index: 60 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-11 1E 0 1 5 10 15 20 25 30 35 40 2F 21-28 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.9 0.0 10.2 SSSS XMMFFFF%%% %.... 10.7 11.9 6.2 00 01 18.2 0.0 11.0 ASSS XXMFFFFF%% %%... 10.7 13.0 6.6 01 02 18.8 0.0 11.5 ASSS SXXFFFFF%% %%.... 11.1 13.8 6.9 02 03 19.8 0.0 11.7 ASSS SXXXFFFFF% %%%.... 11.5 14.2 7.0 03 04 20.3 0.0 11.8 ASSS SXXXFFFFFF %%%%.... 11.9 14.4 7.0 04 05 20.1 0.0 11.6 ASSS SXXXFFFFFF %%%.... 12.1 14.2 6.9 05 06 18.8 0.0 11.3 ASSS SXXMFFFF%% %%..... 11.7 13.8 6.7 06 07 17.7 0.0 10.7 SSSS XXMFFFF%%% %%.... 11.0 12.9 6.4 07 08 17.2 0.0 9.9 ASSSX XMMFFFF%%% %.... 10.7 11.5 6.0 08 09 17.4 0.0 8.5 SSSXM MMMFFFF%%% %..... 10.9 9.1 5.3 09 10 15.0 0.0 4.7 AMMMMMM MMMF%%%%%% ...... 10.3 0.0 3.8 10 11 12.6 0.0 0.0 XMMMMMMMMM MM%%%%%%.. ...... 8.9 1.8 0.0 11 12 11.3 0.0 0.0 XMMMMMMMMM M%%%%%.... ... 8.1 1.8 0.0 12 13 10.8 0.0 0.0 XMMMMMMMMM %%%%%%.... .. 7.4 1.8 0.0 13 14 10.9 0.0 0.0 XMMMMMMMMF %%%%%..... . 7.2 1.8 0.0 14 15 11.3 0.0 0.0 XMMMMMMMMF F%%%%..... 7.3 1.8 0.0 15 16 10.8 0.0 0.0 XMMMMMMMMF %%%%..... 7.0 1.8 0.0 16 17 10.0 0.0 0.0 XMMMMMMMF% %%%..... 6.7 1.8 0.0 17 18 8.6 0.0 0.0 XMMMMMMM%% %..... 6.3 1.8 0.0 18 19 7.6 0.0 0.0 XMMMMMM%%% .... 5.8 1.8 0.0 19 20 7.3 0.0 0.0 XMMMMMM%%% .... 5.6 1.8 0.0 20 21 8.7 0.0 0.0 XMMMMMMF%% %%.... 6.1 1.8 0.0 21 22 13.1 0.0 6.8 SSMMMM FFF%%%%... . 8.5 6.5 4.4 22 23 16.9 0.0 9.1 ASSSX MMFFFF%%%% ... 10.3 10.1 5.6 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) 18-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000