SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 13 August, 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 7-9 1E 0 1 5 10 15 20 25 30 35 40 2F 21-25 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 18.3 0.0 9.3 ASSSX MMMFFFFF%% %.... 11.5 10.3 5.8 00 01 19.9 0.0 10.2 SSSS XMMMFFFFF% %%%.... 12.5 11.9 6.3 01 02 19.4 0.0 10.8 ASSS XXMMMFFFF% %%%..... 12.7 12.8 6.5 02 03 18.7 0.0 11.1 ASSS SXXMMFFF%% %%%..... 12.8 13.3 6.7 03 04 17.8 0.0 11.1 ASSS SXXMFFF%%% %%..... 12.2 13.5 6.7 04 05 17.4 0.0 11.0 ASSS XXXMFFF%%% %..... 12.0 13.4 6.6 05 06 17.0 0.0 10.6 SSSS XXMMFF%%%% %..... 11.7 12.9 6.3 06 07 16.8 0.0 9.9 ASSSX XMMMFF%%%% %..... 11.5 12.0 5.9 07 08 16.5 0.0 8.8 SSSXX MMMFFF%%%% ...... 11.6 10.2 5.3 08 09 16.2 0.0 6.4 ASSMMMM MMMFFF%%%% ..... 11.2 6.3 4.0 09 10 13.2 0.0 0.0 XMMMMMMMMM MFF%%%%... ... 9.4 1.8 0.0 10 11 10.4 0.0 0.0 XMMMMMMMMF %%%...... 7.5 1.8 0.0 11 12 9.2 0.0 0.0 XMMMMMMMF% %%..... 6.7 1.8 0.0 12 13 8.4 0.0 0.0 XMMMMMMF%% %..... 6.1 1.8 0.0 13 14 8.3 0.0 0.0 XMMMMMMF%% %.... 6.0 1.8 0.0 14 15 8.0 0.0 0.0 XMMMMMM%%% %.... 5.8 1.8 0.0 15 16 7.7 0.0 0.0 XMMMMMM%%% .... 5.7 1.8 0.0 16 17 7.6 0.0 0.0 XMMMMMM%%% .... 5.7 1.8 0.0 17 18 7.1 0.0 0.0 XMMMMMM%%% .... 5.5 1.8 0.0 18 19 6.4 0.0 0.0 XMMMMM%%%. .... 4.7 1.8 0.0 19 20 5.7 0.0 0.0 XMMMM%%%.. .. 4.1 1.8 0.0 20 21 5.3 0.0 0.0 XMMMMM%%.. . 4.3 1.8 0.0 21 22 7.8 0.0 0.0 MMMMMMF%%% ... 5.3 0.0 1.8 22 23 15.4 0.0 7.5 ASSMMM MFFFF%%%.. . 9.5 7.2 4.9 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-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000