SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 2 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 9.0 ASSXM MMMFFFF%%% %.... 11.3 9.9 5.6 00 01 19.3 0.0 10.0 SSSX XMMMFFFFF% %%..... 12.2 11.6 6.1 01 02 18.8 0.0 10.5 SSSS XXMMFFFF%% %%..... 12.4 12.5 6.4 02 03 17.9 0.0 10.8 ASSS XXXMFFF%%% %%..... 12.3 13.1 6.6 03 04 16.9 0.0 10.9 ASSS XXXMFF%%%% %..... 11.9 13.3 6.6 04 05 16.7 0.0 10.8 ASSS XXXMFF%%%% %..... 11.6 13.1 6.5 05 06 16.3 0.0 10.4 SSSS XXMMFF%%%% ..... 11.3 12.6 6.2 06 07 16.1 0.0 9.7 ASSSX XMMFFF%%%% ...... 11.1 11.7 5.8 07 08 15.8 0.0 8.5 SSSXM MMMFF%%%%% ..... 11.1 9.9 5.1 08 09 15.3 0.0 5.8 ASMMMMM MMMFF%%%%. .... 10.7 5.5 3.7 09 10 12.2 0.0 0.0 XMMMMMMMMM MF%%%..... . 8.8 1.7 0.0 10 11 9.6 0.0 0.0 XMMMMMMMM% %%...... 7.1 1.7 0.0 11 12 8.5 0.0 0.0 XMMMMMMM%% %..... 6.3 1.7 0.0 12 13 7.9 0.0 0.0 XMMMMMM%%% ..... 5.8 1.7 0.0 13 14 7.7 0.0 0.0 XMMMMMM%%% .... 5.7 1.7 0.0 14 15 7.6 0.0 0.0 XMMMMMM%%% .... 5.6 1.7 0.0 15 16 7.5 0.0 0.0 XMMMMMM%%% .... 5.6 1.7 0.0 16 17 7.3 0.0 0.0 XMMMMMF%%% ... 5.5 1.7 0.0 17 18 6.7 0.0 0.0 XMMMMMM%%. ... 5.2 1.7 0.0 18 19 6.0 0.0 0.0 XMMMMM%%%. ... 4.5 1.7 0.0 19 20 5.3 0.0 0.0 XMMMM%%%.. .. 3.9 1.7 0.0 20 21 5.2 0.0 0.0 XMMMM%%%.. . 4.1 1.7 0.0 21 22 7.5 0.0 0.0 XMMMMMF%%% ... 5.3 1.7 0.0 22 23 14.6 0.0 7.2 ASSMMM FFFF%%%... 8.9 6.5 4.7 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) 2-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000