SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 31 August, 2026 T-index: 90 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 21.4 0.0 10.1 SSSS XMMMMFFFFF F%%%%... 13.4 11.2 6.2 00 01 23.0 0.0 11.0 ASSS XXMMMMFFFF FF%%%%.... 14.2 12.7 6.7 01 02 22.9 0.0 11.6 ASSS SXXMMMFFFF FF%%%%.... . 14.2 13.6 7.0 02 03 22.8 0.0 11.9 SSS SXXXMMFFFF FF%%%%.... 14.2 14.1 7.2 03 04 22.0 0.0 12.0 SSS SXXXMMFFFF F%%%%.... 14.0 14.3 7.2 04 05 21.5 0.0 11.8 SSS SXXXMMFFFF F%%%..... 13.9 14.1 7.1 05 06 20.4 0.0 11.4 ASSS SXXMMFFFFF %%%%.... 13.4 13.7 6.8 06 07 19.8 0.0 10.8 SSSS XXMMMFFFF% %%%..... 13.0 12.7 6.4 07 08 19.8 0.0 9.6 ASSSX MMMMMFFFF% %%%..... 12.9 11.0 5.8 08 09 19.5 0.0 7.5 ASSMMM MMMMMFFFF% %%%..... 12.7 7.6 4.7 09 10 16.6 0.0 0.0 XMMMMMMMMM MMMMFF%%%% %...... 11.2 1.9 0.0 10 11 13.0 0.0 0.0 XMMMMMMMMM MF%%%%%... ... 9.2 1.9 0.0 11 12 11.6 0.0 0.0 XMMMMMMMMM F%%%%..... . 8.2 1.9 0.0 12 13 10.9 0.0 0.0 XMMMMMMMMF %%%%...... 7.5 1.9 0.0 13 14 10.6 0.0 0.0 XMMMMMMMMF %%%%..... 7.2 1.9 0.0 14 15 10.4 0.0 0.0 XMMMMMMMFF %%%%..... 6.9 1.9 0.0 15 16 9.8 0.0 0.0 XMMMMMMMF% %%%..... 6.7 1.9 0.0 16 17 9.2 0.0 0.0 XMMMMMMMF% %%..... 6.5 1.9 0.0 17 18 8.3 0.0 0.0 XMMMMMMF%% %..... 6.2 1.9 0.0 18 19 7.6 0.0 0.0 XMMMMMM%%% ..... 5.4 1.9 0.0 19 20 6.8 0.0 0.0 XMMMMM%%%. ... 4.9 1.9 0.0 20 21 6.8 0.0 0.0 XMMMMM%%%. ... 5.3 1.9 0.0 21 22 10.2 0.0 0.0 MMMMMMMMFF %%%... 6.6 0.0 3.3 22 23 18.2 0.0 8.5 SSSMM MMMFFFFF%% %... 11.2 8.5 5.4 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) 31-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000