SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 26 February, 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 7-12 1E 0 1 5 10 15 20 25 30 35 40 2F 22-29 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.4 0.0 10.8 ASSS XXMFFFF%%% %.... 11.0 12.3 6.5 00 01 18.7 0.0 11.6 ASSS SXXMFFFF%% %%%... 11.5 13.5 7.0 01 02 19.6 0.0 12.1 SSS SXXXFFFFF% %%%.... 11.9 14.3 7.2 02 03 20.9 0.0 12.3 SSS SSXXMFFFFF %%%%..... 12.4 14.7 7.4 03 04 21.1 0.0 12.4 SSS SSXXMFFFFF F%%%%.... 12.5 14.9 7.4 04 05 21.5 0.0 12.3 SSS SSXXMFFFFF F%%%%..... 12.7 14.7 7.3 05 06 21.2 0.0 11.9 SSS SXXXMFFFFF F%%%%..... 12.6 14.3 7.1 06 07 20.5 0.0 11.3 ASSS SXXMMFFFFF %%%%%..... 12.3 13.3 6.8 07 08 19.8 0.0 10.4 SSSS XMMMMFFFF% %%%%..... 12.1 11.9 6.3 08 09 18.8 0.0 8.9 ASSXM MMMMFFFF%% %%%..... 11.8 9.4 5.5 09 10 17.2 0.0 4.5 AMMMMMM MMMMFFF%%% %%..... 11.0 0.0 3.9 10 11 14.9 0.0 0.0 XMMMMMMMMM MMMF%%%%%% ...... 10.1 1.9 0.0 11 12 13.5 0.0 0.0 XMMMMMMMMM MFF%%%%%.. ... 9.0 1.9 0.0 12 13 12.7 0.0 0.0 XMMMMMMMMM MF%%%%%... .. 8.4 1.9 0.0 13 14 12.0 0.0 0.0 XMMMMMMMMM F%%%%%.... . 7.8 1.9 0.0 14 15 12.2 0.0 0.0 XMMMMMMMMF FF%%%%.... 7.8 1.9 0.0 15 16 12.2 0.0 0.0 XMMMMMMMMF FF%%%..... 7.7 1.9 0.0 16 17 11.9 0.0 0.0 XMMMMMMMMF F%%%%..... 7.6 1.9 0.0 17 18 10.3 0.0 0.0 XMMMMMMMMF %%%%.... 7.2 1.9 0.0 18 19 9.3 0.0 0.0 XMMMMMMMF% %%%.... 6.9 1.9 0.0 19 20 8.1 0.0 0.0 XMMMMMMF%% %.... 6.2 1.9 0.0 20 21 8.0 0.0 0.0 XMMMMMM%%% %.... 6.0 1.9 0.0 21 22 11.4 0.0 7.1 ASSMMF F%%%%.... 7.5 6.5 4.6 22 23 16.0 0.0 9.5 ASSSX MMFFF%%%%. ... 9.9 10.4 5.8 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) 26-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000