SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 26 July, 2026 T-index: 72 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 18.8 0.0 9.2 ASSSM MMMFFFFF%% %%.... 11.8 10.0 5.7 00 01 20.4 0.0 10.2 SSSS XMMMMFFFFF %%%%.... 13.0 11.7 6.3 01 02 20.3 0.0 10.8 ASSS XXMMMFFFFF %%%%..... 13.4 12.7 6.6 02 03 19.8 0.0 11.1 ASSS SXXMMFFFF% %%%%..... 13.4 13.2 6.7 03 04 18.6 0.0 11.2 ASSS SXXMMFFF%% %%...... 12.9 13.4 6.7 04 05 18.4 0.0 11.0 ASSS XXXMMFFF%% %%..... 12.5 13.3 6.6 05 06 17.7 0.0 10.6 SSSS XXMMFFF%%% %...... 12.1 12.7 6.4 06 07 17.5 0.0 9.9 ASSSX XMMMFFF%%% %...... 11.9 11.8 5.9 07 08 17.3 0.0 8.6 SSSXM MMMMFFF%%% %...... 12.0 9.9 5.2 08 09 16.7 0.0 5.6 ASMMMMM MMMMFF%%%% ...... 11.5 5.1 3.6 09 10 13.1 0.0 0.0 XMMMMMMMMM MFF%%%.... ... 9.4 1.8 0.0 10 11 10.1 0.0 0.0 XMMMMMMMMF %%%...... 7.4 1.8 0.0 11 12 8.9 0.0 0.0 XMMMMMMM%% %%..... 6.5 1.8 0.0 12 13 8.2 0.0 0.0 XMMMMMMF%% %..... 6.0 1.8 0.0 13 14 7.8 0.0 0.0 XMMMMMM%%% ..... 5.7 1.8 0.0 14 15 7.5 0.0 0.0 XMMMMMM%%% .... 5.5 1.8 0.0 15 16 7.3 0.0 0.0 XMMMMMM%%% .... 5.5 1.8 0.0 16 17 7.1 0.0 0.0 XMMMMMF%%% ... 5.5 1.8 0.0 17 18 6.7 0.0 0.0 XMMMMMM%%. ... 5.2 1.8 0.0 18 19 6.3 0.0 0.0 XMMMMM%%%. ... 4.6 1.8 0.0 19 20 5.6 0.0 0.0 XMMMM%%%.. .. 4.1 1.8 0.0 20 21 5.5 0.0 0.0 XMMMMM%%.. .. 4.3 1.8 0.0 21 22 8.0 0.0 0.0 XMMMMMF%%% ... 5.3 1.8 0.0 22 23 14.9 0.0 7.2 ASSMMM FFFF%%%... . 9.1 6.1 4.8 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) 26-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000