SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 7 December, 2025 T-index: 120 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 8-15 1E 0 1 5 10 15 20 25 30 35 40 2F 22-34 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.3 0.0 11.6 ASSS XXXFFFF%%% .... 10.1 13.2 7.0 00 01 18.2 0.0 12.4 SSS XXXXFFFF%% %..... 10.6 14.3 7.4 01 02 19.0 0.0 12.8 ASS XXXXFFFF%% %%.... 11.0 15.0 7.7 02 03 19.7 0.0 13.1 ASS SXXXXFFFF% %%%... 11.3 15.4 7.8 03 04 20.4 0.0 13.2 ASS SXXXXFFFFF %%%.... 11.6 15.5 7.8 04 05 21.0 0.0 13.0 ASS SXXXXFFFFF %%%%.... 11.8 15.4 7.8 05 06 19.9 0.0 12.7 ASS SXXXFFFFF% %%%%.... 11.6 14.9 7.6 06 07 19.1 0.0 12.1 SSS SXXMFFFFF% %%%..... 11.3 14.0 7.3 07 08 18.4 0.0 11.3 ASSS SXMFFFFF%% %%..... 11.1 12.7 6.9 08 09 17.8 0.0 10.0 SSSX MMMFFFF%%% %%.... 11.0 10.6 6.2 09 10 17.0 0.0 7.7 SSMMM MMMFFF%%%% %.... 10.9 6.1 5.1 10 11 16.0 0.0 0.0 XXMMMMMMMM MMMFF%%%%% .... 10.8 2.1 0.0 11 12 15.5 0.0 0.0 XXMMMMMMMM MMFFF%%%%. .... 10.3 2.1 0.0 12 13 15.6 0.0 0.0 XXMMMMMMMM MMFFF%%%%. .... 9.9 2.1 0.0 13 14 15.7 0.0 0.0 XXMMMMMMMM MFFFF%%%%. .... 9.5 2.1 0.0 14 15 16.0 0.0 0.0 XXMMMMMMMM MFFFF%%%%% .... 9.5 2.1 0.0 15 16 15.9 0.0 0.0 XXMMMMMMMM MFFFF%%%%. .... 9.5 2.1 0.0 16 17 14.5 0.0 0.0 XXMMMMMMMM FFFF%%%%.. .. 8.8 2.1 0.0 17 18 12.8 0.0 0.0 XXMMMMMMMM FF%%%%.... 8.1 2.1 0.0 18 19 12.0 0.0 0.0 XXMMMMMMMF F%%%%%.... 7.5 2.1 0.0 19 20 11.2 0.0 0.0 XXMMMMMMMF F%%%%.... 7.1 2.1 0.0 20 21 11.5 0.0 0.0 XXMMMMMMMF F%%%%.... 7.3 2.1 0.0 21 22 14.7 0.0 8.7 SSSXM MFFF%%%%.. .. 8.9 9.1 5.3 22 23 16.6 0.0 10.5 SSSX XMFFFF%%%. ... 9.8 11.6 6.4 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) 7-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000