SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 4 October, 2026 T-index: 45 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 17.4 0.0 9.8 ASSSX XMMFFFF%%% %... 10.8 11.4 6.0 00 01 18.0 0.0 10.6 SSSS XXMFFFF%%% %%... 10.9 12.6 6.4 01 02 18.3 0.0 11.1 ASSS XXXFFFFF%% %%... 10.9 13.4 6.6 02 03 18.6 0.0 11.3 ASSS SXXFFFFF%% %%.... 11.1 13.8 6.8 03 04 18.8 0.0 11.4 ASSS SXXMFFFF%% %%.... 11.4 14.0 6.8 04 05 18.5 0.0 11.2 ASSS SXXMFFFF%% %%... 11.6 13.9 6.7 05 06 17.5 0.0 10.9 ASSS XXXMFFF%%% %.... 11.2 13.4 6.5 06 07 16.9 0.0 10.3 SSSS XXMFFF%%%% ..... 10.7 12.5 6.2 07 08 16.5 0.0 9.4 ASSSX XMMFFF%%%% .... 10.5 11.1 5.7 08 09 16.4 0.0 7.9 ASSXMM MMMFFF%%%% .... 10.6 8.6 4.9 09 10 13.8 0.0 0.0 MMMMMMMMMM MMF%%%%%.. .... 9.7 0.0 3.1 10 11 11.2 0.0 0.0 XMMMMMMMMM M%%%%%.... ... 8.1 1.7 0.0 11 12 9.9 0.0 0.0 XMMMMMMMMM %%%%...... 7.4 1.7 0.0 12 13 9.4 0.0 0.0 XMMMMMMMM% %%%%..... 6.8 1.7 0.0 13 14 9.4 0.0 0.0 XMMMMMMMF% %%%..... 6.6 1.7 0.0 14 15 9.8 0.0 0.0 XMMMMMMMF% %%%.... 6.6 1.7 0.0 15 16 9.4 0.0 0.0 XMMMMMMMF% %%..... 6.4 1.7 0.0 16 17 8.8 0.0 0.0 XMMMMMMF%% %..... 6.3 1.7 0.0 17 18 7.7 0.0 0.0 XMMMMMM%%% .... 5.8 1.7 0.0 18 19 6.8 0.0 0.0 XMMMMM%%%. ... 5.1 1.7 0.0 19 20 6.4 0.0 0.0 XMMMMM%%%. .. 5.0 1.7 0.0 20 21 7.4 0.0 0.0 XMMMMMM%%% .... 5.5 1.7 0.0 21 22 11.2 0.0 6.0 ASMMMMF F%%%.... 7.6 4.8 4.0 22 23 15.8 0.0 8.6 SSSXM MMFFF%%%%. .. 10.0 9.5 5.3 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) 4-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000