SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 20 June, 2026 T-index: 75 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 19.8 0.0 8.9 ASSXM MMMMFFFFF% %%%.... 12.4 9.5 5.6 00 01 21.2 0.0 10.0 SSSX XMMMMMFFFF F%%%%.... 13.7 11.4 6.2 01 02 21.4 0.0 10.7 ASSS XXMMMMFFFF F%%%%..... . 14.2 12.5 6.5 02 03 20.4 0.0 11.0 ASSS XXMMMMFFFF %%%%...... 13.8 13.0 6.7 03 04 19.8 0.0 11.1 ASSS SXXMMMFFF% %%%%..... 13.5 13.2 6.7 04 05 19.4 0.0 10.9 ASSS XXXMMFFFF% %%%...... 13.1 13.1 6.6 05 06 19.2 0.0 10.5 SSSS XXMMMFFFF% %%%...... 13.0 12.5 6.3 06 07 19.4 0.0 9.7 ASSSX XMMMMFFFF% %%%....... 12.7 11.5 5.8 07 08 18.7 0.0 8.4 ASSSXM MMMMMFFF%% %%%...... 12.4 9.6 5.0 08 09 16.6 0.0 4.4 ASMMMMMM MMMFFF%%%% ...... 11.4 0.0 3.0 09 10 13.1 0.0 0.0 XMMMMMMMMM MFF%%%.... ... 9.2 1.9 0.0 10 11 9.5 0.0 0.0 XMMMMMMMM% %%...... 7.0 1.9 0.0 11 12 8.2 0.0 0.0 XMMMMMMF%% %..... 6.2 1.9 0.0 12 13 8.0 0.0 0.0 XMMMMMM%%% ...... 5.9 1.9 0.0 13 14 7.7 0.0 0.0 XMMMMMM%%% ..... 5.7 1.9 0.0 14 15 7.1 0.0 0.0 XMMMMMF%%% ... 5.4 1.9 0.0 15 16 7.0 0.0 0.0 XMMMMMM%%. ... 5.5 1.9 0.0 16 17 7.1 0.0 0.0 XMMMMMM%%% ... 5.5 1.9 0.0 17 18 6.9 0.0 0.0 XMMMMMM%%% .... 5.3 1.9 0.0 18 19 6.7 0.0 0.0 XMMMMM%%%. .... 5.0 1.9 0.0 19 20 6.2 0.0 0.0 XMMMMM%%%. ... 4.5 1.9 0.0 20 21 6.0 0.0 0.0 XMMMMM%%%. ... 4.6 1.9 0.0 21 22 8.3 0.0 0.0 XMMMMMFF%% %... 5.6 1.9 0.0 22 23 15.1 0.0 6.7 ASMMMM FFFFF%%... . 9.0 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) 20-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000