SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 18 July, 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 8.8 ASSXM MMMFFFF%%% %.... 11.3 9.6 5.5 00 01 19.1 0.0 9.8 ASSSX XMMMFFFFF% %%.... 12.2 11.3 6.0 01 02 18.5 0.0 10.4 SSSS XXMMFFFF%% %%..... 12.3 12.3 6.3 02 03 17.6 0.0 10.7 ASSS XXMMFFF%%% %%..... 12.2 12.9 6.5 03 04 16.7 0.0 10.8 ASSS XXXMFF%%%% ..... 11.7 13.1 6.5 04 05 16.5 0.0 10.6 SSSS XXMMFF%%%% ..... 11.5 12.9 6.4 05 06 16.1 0.0 10.2 SSSS XXMFFF%%%% ..... 11.1 12.4 6.1 06 07 16.0 0.0 9.5 ASSSX XMMFF%%%%% ..... 11.0 11.4 5.7 07 08 15.7 0.0 8.3 ASSSXM MMMFF%%%%. ..... 11.0 9.6 4.9 08 09 14.9 0.0 5.1 SSMMMMM MMMF%%%%.. .... 10.4 4.4 3.3 09 10 11.4 0.0 0.0 XMMMMMMMMM F%%%%..... 8.5 1.7 0.0 10 11 8.9 0.0 0.0 XMMMMMMM%% %%..... 6.6 1.7 0.0 11 12 8.0 0.0 0.0 XMMMMMM%%% ..... 6.0 1.7 0.0 12 13 7.5 0.0 0.0 XMMMMMM%%% .... 5.6 1.7 0.0 13 14 7.3 0.0 0.0 XMMMMMF%%. .... 5.4 1.7 0.0 14 15 7.1 0.0 0.0 XMMMMMF%%. ... 5.4 1.7 0.0 15 16 7.1 0.0 0.0 XMMMMMF%%. ... 5.4 1.7 0.0 16 17 6.8 0.0 0.0 XMMMMM%%%. ... 5.4 1.7 0.0 17 18 6.3 0.0 0.0 XMMMMM%%%. ... 5.0 1.7 0.0 18 19 5.7 0.0 0.0 XMMMMM%%.. ... 4.4 1.7 0.0 19 20 5.2 0.0 0.0 XMMMM%%%.. . 3.8 1.7 0.0 20 21 5.2 0.0 0.0 XMMMM%%%.. . 4.0 1.7 0.0 21 22 7.5 0.0 0.0 XMMMMMF%%% ... 5.3 1.7 0.0 22 23 13.9 0.0 6.8 ASMMMF FFF%%%... 8.4 5.4 4.6 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) 18-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000