SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 4 July, 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 21-24 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.0 0.0 8.9 ASSXM MMMMFFFF%% %%.... 12.0 9.5 5.6 00 01 20.4 0.0 10.0 SSSX XMMMMFFFFF %%%%.... 13.1 11.4 6.1 01 02 20.1 0.0 10.6 ASSS XXMMMFFFFF %%%%..... 13.5 12.4 6.5 02 03 19.4 0.0 10.9 ASSS XXMMMFFFF% %%%%..... 13.3 13.0 6.6 03 04 18.5 0.0 11.0 ASSS XXXMMFFF%% %%...... 12.8 13.2 6.6 04 05 18.3 0.0 10.8 ASSS XXMMMFFF%% %%..... 12.5 13.0 6.5 05 06 18.1 0.0 10.4 SSSS XXMMMFFF%% %%...... 12.3 12.5 6.2 06 07 18.1 0.0 9.6 ASSSX XMMMFFFF%% %%...... 12.1 11.5 5.8 07 08 17.6 0.0 8.3 ASSSXM MMMMFFF%%% %...... 12.0 9.6 5.0 08 09 16.2 0.0 4.6 SMMMMMM MMMFFF%%%% ..... 11.3 3.2 3.1 09 10 12.6 0.0 0.0 XMMMMMMMMM MF%%%%.... .. 9.1 1.8 0.0 10 11 9.3 0.0 0.0 XMMMMMMMF% %%...... 7.0 1.8 0.0 11 12 8.2 0.0 0.0 XMMMMMMF%% %..... 6.2 1.8 0.0 12 13 7.8 0.0 0.0 XMMMMMM%%% ..... 5.8 1.8 0.0 13 14 7.4 0.0 0.0 XMMMMMM%%% .... 5.5 1.8 0.0 14 15 7.0 0.0 0.0 XMMMMM%%%. ... 5.4 1.8 0.0 15 16 6.9 0.0 0.0 XMMMMM%%%. ... 5.4 1.8 0.0 16 17 6.8 0.0 0.0 XMMMMM%%%. ... 5.4 1.8 0.0 17 18 6.6 0.0 0.0 XMMMMMM%%. ... 5.1 1.8 0.0 18 19 6.3 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 5.7 0.0 0.0 XMMMMM%%.. .. 4.4 1.8 0.0 21 22 8.0 0.0 0.0 XMMMMMF%%% .... 5.4 1.8 0.0 22 23 14.5 0.0 6.7 ASMMMM FFFF%%%... 8.7 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) 4-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000