SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 23 August, 2026 T-index: 80 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-10 1E 0 1 5 10 15 20 25 30 35 40 2F 21-26 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.9 0.0 9.8 SSSX MMMMFFFFF% %%%.... 12.7 10.8 6.1 00 01 21.6 0.0 10.7 ASSS XXMMMMFFFF F%%%%..... 13.7 12.4 6.6 01 02 21.7 0.0 11.3 ASSS SXXMMMFFFF F%%%%..... 13.8 13.3 6.9 02 03 21.4 0.0 11.6 ASSS SXXMMMFFFF F%%%%..... 13.8 13.8 7.0 03 04 20.6 0.0 11.7 ASSS SXXMMFFFFF %%%%..... 13.5 14.0 7.0 04 05 20.1 0.0 11.5 ASSS SXXMMFFFFF %%%..... 13.4 13.8 6.9 05 06 19.0 0.0 11.1 ASSS SXXMMFFF%% %%%..... 12.8 13.4 6.6 06 07 18.5 0.0 10.4 SSSS XXMMMFFF%% %%...... 12.5 12.4 6.2 07 08 18.3 0.0 9.3 ASSSX MMMMFFFF%% %%...... 12.5 10.7 5.6 08 09 18.1 0.0 7.1 SSSMMM MMMMFFFF%% %%..... 12.4 7.1 4.4 09 10 15.0 0.0 0.0 XMMMMMMMMM MMMF%%%%%. ...... 10.3 1.9 0.0 10 11 11.7 0.0 0.0 XMMMMMMMMM F%%%%%.... .. 8.4 1.9 0.0 11 12 10.4 0.0 0.0 XMMMMMMMMF %%%%...... 7.5 1.9 0.0 12 13 9.7 0.0 0.0 XMMMMMMMF% %%%..... 6.9 1.9 0.0 13 14 9.4 0.0 0.0 XMMMMMMMF% %%%..... 6.6 1.9 0.0 14 15 9.2 0.0 0.0 XMMMMMMMF% %%..... 6.3 1.9 0.0 15 16 8.8 0.0 0.0 XMMMMMMF%% %%.... 6.2 1.9 0.0 16 17 8.5 0.0 0.0 XMMMMMMF%% %..... 6.1 1.9 0.0 17 18 7.8 0.0 0.0 XMMMMMM%%% %.... 5.9 1.9 0.0 18 19 7.2 0.0 0.0 XMMMMMM%%% .... 5.1 1.9 0.0 19 20 6.4 0.0 0.0 XMMMMM%%%. ... 4.6 1.9 0.0 20 21 6.2 0.0 0.0 XMMMMM%%%. .. 4.9 1.9 0.0 21 22 9.0 0.0 0.0 MMMMMMMF%% %.... 5.9 0.0 2.9 22 23 16.9 0.0 8.1 SSSMM MMFFFF%%%% ... 10.6 8.0 5.2 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) 23-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000