SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 24 March, 2026 T-index: 55 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 21-26 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.9 0.0 9.8 ASSSX XMMMFFF%%% %... 11.6 11.3 6.0 00 01 19.5 0.0 10.6 SSSS XXMMMFFFF% %%%.... 12.5 12.6 6.4 01 02 20.5 0.0 11.1 ASSS SXXMMFFFFF %%%%.... 12.5 13.4 6.7 02 03 21.1 0.0 11.4 ASSS SXXMMFFFFF F%%%%.... 12.6 13.8 6.8 03 04 21.2 0.0 11.5 ASSS SXXMMFFFFF F%%%%.... 12.8 14.0 6.9 04 05 21.3 0.0 11.3 ASSS SXXMMFFFFF F%%%%.... 13.0 13.9 6.8 05 06 20.8 0.0 11.0 ASSS XXXMMFFFFF %%%%%.... 12.7 13.4 6.5 06 07 20.5 0.0 10.4 SSSS XXMMMFFFFF %%%%%.... 12.4 12.5 6.2 07 08 20.3 0.0 9.4 ASSSX MMMMMFFFFF %%%%%.... 12.3 11.0 5.7 08 09 19.1 0.0 7.7 ASSXMM MMMMMFFFF% %%%..... 12.2 8.2 4.8 09 10 15.3 0.0 0.0 XMMMMMMMMM MMMFF%%%%% ...... 10.4 1.7 0.0 10 11 11.5 0.0 0.0 XMMMMMMMMM M%%%%%%... ... 8.2 1.7 0.0 11 12 9.9 0.0 0.0 XMMMMMMMMM %%%%...... 7.2 1.7 0.0 12 13 9.1 0.0 0.0 XMMMMMMMM% %%%...... 6.7 1.7 0.0 13 14 9.1 0.0 0.0 XMMMMMMMF% %%%.... 6.4 1.7 0.0 14 15 9.6 0.0 0.0 XMMMMMMMF% %%..... 6.5 1.7 0.0 15 16 9.5 0.0 0.0 XMMMMMMMF% %%..... 6.5 1.7 0.0 16 17 9.4 0.0 0.0 XMMMMMMMF% %%..... 6.4 1.7 0.0 17 18 8.8 0.0 0.0 XMMMMMMM%% %%.... 6.3 1.7 0.0 18 19 8.0 0.0 0.0 XMMMMMM%%% %.... 5.8 1.7 0.0 19 20 6.9 0.0 0.0 XMMMMM%%%. ... 5.1 1.7 0.0 20 21 6.6 0.0 0.0 XMMMMM%%%. .. 5.1 1.7 0.0 21 22 10.2 0.0 5.0 AMMMMFF %%%... 6.7 0.0 3.8 22 23 15.9 0.0 8.5 SSSXM MMFFF%%%%. .. 10.1 9.1 5.3 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) 24-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000