SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 30 July, 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 21-25 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 20.3 0.0 9.5 ASSSX MMMMFFFFFF %%%..... 12.7 10.3 6.0 00 01 22.1 0.0 10.6 ASSS XMMMMMFFFF FF%%%..... 14.1 12.0 6.5 01 02 22.1 0.0 11.2 ASSS SXMMMMFFFF FF%%%%.... . 14.4 13.0 6.8 02 03 21.8 0.0 11.5 ASSS SXXMMMFFFF F%%%%..... . 14.5 13.6 7.0 03 04 20.4 0.0 11.6 ASSS SXXMMMFFFF %%%%..... 13.8 13.8 7.0 04 05 20.1 0.0 11.4 ASSS SXXMMFFFFF %%%..... 13.5 13.6 6.9 05 06 19.3 0.0 11.0 ASSS XXXMMFFFF% %%%..... 13.0 13.1 6.6 06 07 19.1 0.0 10.3 SSSS XXMMMFFFF% %%...... 12.8 12.1 6.1 07 08 18.9 0.0 9.0 SSSXX MMMMMFFF%% %%...... 12.9 10.2 5.4 08 09 18.5 0.0 6.0 ASMMMMM MMMMMFFF%% %%..... 12.6 5.5 3.9 09 10 14.9 0.0 0.0 XMMMMMMMMM MMFF%%%%.. .... 10.5 1.9 0.0 10 11 11.5 0.0 0.0 XMMMMMMMMM F%%%%..... 8.2 1.9 0.0 11 12 10.0 0.0 0.0 XMMMMMMMF% %%%..... 7.2 1.9 0.0 12 13 9.2 0.0 0.0 XMMMMMMMF% %%.... 6.5 1.9 0.0 13 14 8.5 0.0 0.0 XMMMMMMF%% %..... 6.2 1.9 0.0 14 15 8.1 0.0 0.0 XMMMMMMF%% %.... 5.9 1.9 0.0 15 16 7.8 0.0 0.0 XMMMMMM%%% .... 5.8 1.9 0.0 16 17 7.6 0.0 0.0 XMMMMMM%%% .... 5.8 1.9 0.0 17 18 7.2 0.0 0.0 XMMMMMM%%% .... 5.5 1.9 0.0 18 19 6.6 0.0 0.0 XMMMMM%%%. .... 4.8 1.9 0.0 19 20 5.9 0.0 0.0 XMMMM%%%.. .. 4.3 1.9 0.0 20 21 5.8 0.0 0.0 XMMMMM%%.. .. 4.5 1.9 0.0 21 22 8.3 0.0 0.0 XMMMMMFF%% %... 5.5 1.9 0.0 22 23 16.2 0.0 7.5 ASSMMM MFFFFF%%%. .. 9.8 6.5 5.0 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) 30-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000