SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 20 July, 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 18.2 0.0 8.9 ASSXM MMMFFFFF%% %.... 11.4 9.7 5.6 00 01 19.5 0.0 9.9 SSSX XMMMFFFFF% %%..... 12.4 11.4 6.1 01 02 18.9 0.0 10.5 SSSS XXMMFFFF%% %%%.... 12.6 12.4 6.4 02 03 18.2 0.0 10.8 ASSS XXMMMFFF%% %%...... 12.6 13.0 6.6 03 04 17.1 0.0 10.9 ASSS XXXMFFF%%% %..... 12.1 13.2 6.6 04 05 17.0 0.0 10.7 ASSS XXMMFF%%%% %..... 11.8 13.0 6.5 05 06 16.6 0.0 10.3 SSSS XXMMFF%%%% ...... 11.5 12.5 6.2 06 07 16.6 0.0 9.6 ASSSX XMMFFF%%%% ...... 11.3 11.5 5.7 07 08 16.2 0.0 8.4 ASSSXM MMMFFF%%%% ..... 11.3 9.7 5.0 08 09 15.4 0.0 5.2 SSMMMMM MMMFF%%%%. .... 10.8 4.6 3.4 09 10 12.0 0.0 0.0 XMMMMMMMMM F%%%%..... . 8.7 1.8 0.0 10 11 9.3 0.0 0.0 XMMMMMMMF% %%..... 6.9 1.8 0.0 11 12 8.3 0.0 0.0 XMMMMMMF%% %..... 6.1 1.8 0.0 12 13 7.7 0.0 0.0 XMMMMMM%%% ..... 5.7 1.8 0.0 13 14 7.4 0.0 0.0 XMMMMMM%%% .... 5.5 1.8 0.0 14 15 7.2 0.0 0.0 XMMMMMF%%. ... 5.4 1.8 0.0 15 16 7.1 0.0 0.0 XMMMMMF%%. ... 5.4 1.8 0.0 16 17 6.8 0.0 0.0 XMMMMM%%%. ... 5.4 1.8 0.0 17 18 6.4 0.0 0.0 XMMMMM%%%. ... 5.0 1.8 0.0 18 19 5.9 0.0 0.0 XMMMMM%%%. ... 4.5 1.8 0.0 19 20 5.4 0.0 0.0 XMMMM%%%.. .. 3.9 1.8 0.0 20 21 5.3 0.0 0.0 XMMMM%%%.. .. 4.1 1.8 0.0 21 22 7.7 0.0 0.0 XMMMMMF%%% ... 5.3 1.8 0.0 22 23 14.3 0.0 6.9 ASMMMM FFFF%%.... 8.6 5.6 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) 20-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000