SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 16 August, 2026 T-index: 55 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 17.9 0.0 9.2 ASSSX MMMFFFF%%% %.... 11.3 10.3 5.7 00 01 19.5 0.0 10.2 SSSS XMMMFFFFF% %%..... 12.3 11.8 6.2 01 02 19.0 0.0 10.7 ASSS XXMMFFFF%% %%%..... 12.4 12.8 6.5 02 03 18.1 0.0 11.0 ASSS XXXMFFFF%% %%...... 12.5 13.3 6.6 03 04 17.2 0.0 11.1 ASSS SXXMFFF%%% %..... 11.9 13.5 6.7 04 05 16.9 0.0 10.9 ASSS XXXMFF%%%% %..... 11.7 13.3 6.5 05 06 16.5 0.0 10.5 SSSS XXMMFF%%%% ...... 11.4 12.8 6.3 06 07 16.3 0.0 9.9 ASSSX XMMMFF%%%% ...... 11.2 11.9 5.9 07 08 16.0 0.0 8.7 SSSXX MMMFF%%%%% ..... 11.3 10.2 5.3 08 09 15.6 0.0 6.4 SSMMMM MMMFF%%%%. ..... 10.9 6.4 4.1 09 10 12.8 0.0 0.0 XMMMMMMMMM MF%%%%.... .. 9.1 1.7 0.0 10 11 10.2 0.0 0.0 XMMMMMMMMF %%%...... 7.5 1.7 0.0 11 12 9.0 0.0 0.0 XMMMMMMM%% %%..... 6.6 1.7 0.0 12 13 8.3 0.0 0.0 XMMMMMMF%% %.... 6.1 1.7 0.0 13 14 8.2 0.0 0.0 XMMMMMMF%% %.... 6.0 1.7 0.0 14 15 8.1 0.0 0.0 XMMMMMMF%% %.... 5.8 1.7 0.0 15 16 7.8 0.0 0.0 XMMMMMM%%% .... 5.7 1.7 0.0 16 17 7.7 0.0 0.0 XMMMMMM%%% .... 5.7 1.7 0.0 17 18 7.1 0.0 0.0 XMMMMMM%%% .... 5.4 1.7 0.0 18 19 6.3 0.0 0.0 XMMMMM%%%. .... 4.6 1.7 0.0 19 20 5.5 0.0 0.0 XMMMM%%%.. .. 4.1 1.7 0.0 20 21 5.2 0.0 0.0 XMMMM%%%.. . 4.2 1.7 0.0 21 22 7.6 0.0 0.0 MMMMMMF%%% ... 5.2 0.0 2.2 22 23 15.2 0.0 7.5 ASSMMM MFFFF%%... . 9.5 7.3 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) 16-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000