SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 3 August, 2026 T-index: 70 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 18.7 0.0 9.3 ASSSX MMMFFFFF%% %%.... 11.8 10.2 5.8 00 01 20.3 0.0 10.3 SSSS XMMMMFFFFF %%%%.... 13.0 11.8 6.3 01 02 20.0 0.0 10.9 ASSS XXMMMFFFF% %%%%..... 13.3 12.8 6.6 02 03 19.5 0.0 11.2 ASSS SXXMMFFFF% %%%%..... 13.3 13.3 6.8 03 04 18.5 0.0 11.2 ASSS SXXMMFFF%% %%...... 12.7 13.5 6.8 04 05 18.2 0.0 11.1 ASSS SXXMMFFF%% %%..... 12.4 13.4 6.6 05 06 17.7 0.0 10.7 SSSS XXMMFFF%%% %...... 12.1 12.8 6.4 06 07 17.5 0.0 10.0 ASSSX XMMMFFF%%% %...... 11.9 11.9 5.9 07 08 17.3 0.0 8.7 SSSXX MMMMFFF%%% %...... 12.0 10.1 5.2 08 09 16.8 0.0 6.0 ASMMMMM MMMMFF%%%% ...... 11.6 5.7 3.8 09 10 13.4 0.0 0.0 XMMMMMMMMM MFF%%%%... ... 9.6 1.8 0.0 10 11 10.3 0.0 0.0 XMMMMMMMMF %%%%...... 7.6 1.8 0.0 11 12 9.1 0.0 0.0 XMMMMMMMF% %%..... 6.7 1.8 0.0 12 13 8.4 0.0 0.0 XMMMMMMF%% %..... 6.1 1.8 0.0 13 14 8.1 0.0 0.0 XMMMMMMF%% %.... 5.9 1.8 0.0 14 15 7.7 0.0 0.0 XMMMMMM%%% ..... 5.7 1.8 0.0 15 16 7.5 0.0 0.0 XMMMMMM%%% .... 5.6 1.8 0.0 16 17 7.3 0.0 0.0 XMMMMMM%%% .... 5.6 1.8 0.0 17 18 6.9 0.0 0.0 XMMMMMM%%% .... 5.4 1.8 0.0 18 19 6.5 0.0 0.0 XMMMMM%%%. .... 4.7 1.8 0.0 19 20 5.8 0.0 0.0 XMMMM%%%.. .. 4.2 1.8 0.0 20 21 5.6 0.0 0.0 XMMMMM%%.. .. 4.4 1.8 0.0 21 22 8.0 0.0 0.0 XMMMMMF%%% ... 5.3 1.8 0.0 22 23 15.2 0.0 7.4 ASSMMM MFFFF%%%.. . 9.4 6.7 4.9 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) 3-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000