SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 24 June, 2026 T-index: 68 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 21-24 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.1 0.0 8.8 ASSXM MMMMFFFFF% %%..... 12.1 9.5 5.6 00 01 20.5 0.0 9.9 SSSX XMMMMFFFFF %%%%.... 13.3 11.3 6.1 01 02 20.3 0.0 10.5 SSSS XXMMMMFFFF %%%%..... 13.7 12.4 6.4 02 03 19.5 0.0 10.8 ASSS XXMMMFFFF% %%%%..... 13.3 12.9 6.6 03 04 18.8 0.0 10.9 ASSS XXXMMFFF%% %%%..... 13.0 13.1 6.6 04 05 18.5 0.0 10.8 ASSS XXMMMFFF%% %%...... 12.6 13.0 6.5 05 06 18.2 0.0 10.3 SSSS XXMMMFFF%% %%...... 12.5 12.4 6.2 06 07 18.4 0.0 9.6 ASSSX XMMMMFFF%% %%....... 12.2 11.4 5.7 07 08 17.7 0.0 8.3 ASSSXM MMMMFFF%%% %%...... 12.0 9.5 4.9 08 09 15.8 0.0 4.3 ASMMMMMM MMMFF%%%%. ..... 11.0 0.0 3.0 09 10 12.4 0.0 0.0 XMMMMMMMMM MF%%%%.... .. 8.9 1.8 0.0 10 11 9.2 0.0 0.0 XMMMMMMMF% %%...... 6.9 1.8 0.0 11 12 8.0 0.0 0.0 XMMMMMM%%% ..... 6.1 1.8 0.0 12 13 7.8 0.0 0.0 XMMMMMM%%% ..... 5.8 1.8 0.0 13 14 7.5 0.0 0.0 XMMMMMM%%% .... 5.6 1.8 0.0 14 15 7.1 0.0 0.0 XMMMMMF%%. ... 5.4 1.8 0.0 15 16 7.1 0.0 0.0 XMMMMMM%%. ... 5.5 1.8 0.0 16 17 7.1 0.0 0.0 XMMMMMM%%. ... 5.5 1.8 0.0 17 18 6.8 0.0 0.0 XMMMMMM%%. .... 5.2 1.8 0.0 18 19 6.4 0.0 0.0 XMMMMM%%%. .... 4.8 1.8 0.0 19 20 6.0 0.0 0.0 XMMMMM%%%. ... 4.3 1.8 0.0 20 21 5.8 0.0 0.0 XMMMMM%%.. .. 4.5 1.8 0.0 21 22 8.0 0.0 0.0 XMMMMMF%%% .... 5.6 1.8 0.0 22 23 14.7 0.0 6.6 ASMMMM FFFF%%%... 8.9 0.0 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) 24-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000