SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 20 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 7-10 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 19.0 0.0 9.6 ASSSX MMMMFFFF%% %%.... 12.1 10.6 5.9 00 01 20.7 0.0 10.5 SSSS XXMMMFFFFF %%%%..... 13.2 12.2 6.4 01 02 20.7 0.0 11.1 ASSS SXXMMFFFFF %%%%..... 13.2 13.1 6.7 02 03 20.1 0.0 11.4 ASSS SXXMMFFFFF %%%%...... 13.2 13.6 6.9 03 04 19.3 0.0 11.4 ASSS SXXMMFFFF% %%%..... 12.9 13.8 6.9 04 05 18.8 0.0 11.3 ASSS SXXMMFFF%% %%...... 12.7 13.6 6.8 05 06 18.1 0.0 10.9 ASSS XXXMFFFF%% %%..... 12.3 13.1 6.5 06 07 17.6 0.0 10.2 SSSS XXMMFFF%%% %%..... 12.0 12.2 6.1 07 08 17.3 0.0 9.1 ASSSX MMMMFFF%%% %...... 12.0 10.5 5.5 08 09 17.1 0.0 6.8 SSMMMM MMMMFFF%%% %...... 11.8 6.8 4.3 09 10 14.2 0.0 0.0 XMMMMMMMMM MMFF%%%%.. .... 9.9 1.8 0.0 10 11 11.0 0.0 0.0 XMMMMMMMMM %%%%%..... . 8.0 1.8 0.0 11 12 9.8 0.0 0.0 XMMMMMMMM% %%%...... 7.1 1.8 0.0 12 13 9.0 0.0 0.0 XMMMMMMM%% %%..... 6.5 1.8 0.0 13 14 8.9 0.0 0.0 XMMMMMMM%% %%..... 6.3 1.8 0.0 14 15 8.7 0.0 0.0 XMMMMMMF%% %%.... 6.1 1.8 0.0 15 16 8.3 0.0 0.0 XMMMMMMF%% %.... 6.0 1.8 0.0 16 17 8.1 0.0 0.0 XMMMMMMF%% %.... 5.9 1.8 0.0 17 18 7.5 0.0 0.0 XMMMMMM%%% ..... 5.7 1.8 0.0 18 19 6.8 0.0 0.0 XMMMMM%%%% .... 4.9 1.8 0.0 19 20 6.0 0.0 0.0 XMMMMM%%%. .. 4.4 1.8 0.0 20 21 5.8 0.0 0.0 XMMMMM%%.. .. 4.6 1.8 0.0 21 22 8.4 0.0 0.0 MMMMMMMF%% %... 5.6 0.0 2.6 22 23 16.1 0.0 7.9 SSMMM MFFFFF%%%. .. 10.1 7.8 5.1 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) 20-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000