SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 11 April, 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 20.5 0.0 9.8 ASSSX MMMMMMFFFF %%%%.... 13.2 11.0 6.0 00 01 22.2 0.0 10.7 ASSS XXMMMMMFFF FF%%%%.... 14.1 12.4 6.5 01 02 23.9 0.0 11.2 ASSS SXXMMMMFFF FFF%%%%%.. .. 14.6 13.3 6.8 02 03 24.1 0.0 11.5 ASSS SXXMMMMFFF FFFF%%%%.. .. 14.8 13.8 6.9 03 04 24.1 0.0 11.6 ASSS SXXMMMMFFF FFFF%%%%.. .. 14.8 14.0 7.0 04 05 23.8 0.0 11.4 ASSS SXXMMMMFFF FFF%%%%... .. 14.9 13.8 6.8 05 06 22.7 0.0 11.1 ASSS SXXMMMMFFF FF%%%%%... .. 14.1 13.4 6.6 06 07 22.2 0.0 10.4 SSSS XXMMMMMFFF FF%%%%%... .. 13.9 12.4 6.2 07 08 21.5 0.0 9.3 ASSSX MMMMMMMFFF F%%%%%.... . 13.3 10.8 5.6 08 09 20.3 0.0 7.3 ASSMMM MMMMMMFFFF %%%%%..... 13.1 7.5 4.6 09 10 16.2 0.0 0.0 XMMMMMMMMM MMMMFF%%%% %%...... 11.1 1.8 0.0 10 11 11.9 0.0 0.0 XMMMMMMMMM MM%%%%%... ..... 8.6 1.8 0.0 11 12 10.5 0.0 0.0 XMMMMMMMMM %%%%%..... .. 7.5 1.8 0.0 12 13 9.3 0.0 0.0 XMMMMMMMM% %%%%..... 6.8 1.8 0.0 13 14 9.5 0.0 0.0 XMMMMMMMF% %%%..... 6.7 1.8 0.0 14 15 9.7 0.0 0.0 XMMMMMMMF% %%%..... 6.7 1.8 0.0 15 16 9.6 0.0 0.0 XMMMMMMMF% %%%.... 6.6 1.8 0.0 16 17 9.3 0.0 0.0 XMMMMMMMF% %%..... 6.5 1.8 0.0 17 18 8.9 0.0 0.0 XMMMMMMM%% %%.... 6.4 1.8 0.0 18 19 8.2 0.0 0.0 XMMMMMMF%% %.... 5.6 1.8 0.0 19 20 7.2 0.0 0.0 XMMMMMF%%% ... 5.1 1.8 0.0 20 21 6.7 0.0 0.0 XMMMMM%%%. .. 4.9 1.8 0.0 21 22 9.9 0.0 0.0 MMMMMMMMF% %%%... 6.5 0.0 3.3 22 23 17.6 0.0 8.2 SSSMM MMMFFFF%%% %... 10.9 8.4 5.2 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) 11-Apr-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000