SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 17 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 10.4 5.8 00 01 19.9 0.0 10.2 SSSS XMMMFFFFF% %%%.... 12.6 11.9 6.3 01 02 19.5 0.0 10.8 ASSS XXMMMFFFF% %%%..... 12.7 12.9 6.6 02 03 18.8 0.0 11.1 ASSS SXXMMFFF%% %%%..... 12.8 13.4 6.7 03 04 17.9 0.0 11.2 ASSS SXXMFFF%%% %%..... 12.2 13.5 6.7 04 05 17.5 0.0 11.0 ASSS XXXMFFF%%% %..... 12.0 13.4 6.6 05 06 17.1 0.0 10.6 SSSS XXMMFFF%%% %..... 11.8 12.9 6.4 06 07 16.8 0.0 10.0 ASSSX XMMMFF%%%% %..... 11.5 12.0 5.9 07 08 16.5 0.0 8.8 SSSXX MMMMFF%%%% ...... 11.6 10.2 5.3 08 09 16.3 0.0 6.5 SSMMMM MMMFFF%%%% ..... 11.2 6.5 4.1 09 10 13.4 0.0 0.0 XMMMMMMMMM MFF%%%%... ... 9.5 1.8 0.0 10 11 10.5 0.0 0.0 XMMMMMMMMF %%%%...... 7.6 1.8 0.0 11 12 9.3 0.0 0.0 XMMMMMMMF% %%..... 6.8 1.8 0.0 12 13 8.5 0.0 0.0 XMMMMMMF%% %..... 6.2 1.8 0.0 13 14 8.4 0.0 0.0 XMMMMMMF%% %..... 6.1 1.8 0.0 14 15 8.1 0.0 0.0 XMMMMMMF%% %.... 5.9 1.8 0.0 15 16 7.8 0.0 0.0 XMMMMMM%%% ..... 5.8 1.8 0.0 16 17 7.7 0.0 0.0 XMMMMMM%%% .... 5.8 1.8 0.0 17 18 7.2 0.0 0.0 XMMMMMM%%% .... 5.5 1.8 0.0 18 19 6.5 0.0 0.0 XMMMMM%%%. .... 4.7 1.8 0.0 19 20 5.7 0.0 0.0 XMMMM%%%.. .. 4.2 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 2.2 22 23 15.5 0.0 7.6 ASSMMM MFFFF%%%.. .. 9.6 7.4 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) 17-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000