SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 27 December, 2025 T-index: 115 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 16.8 0.0 11.6 ASSX XXXFFF%%%. ... 9.7 13.2 6.9 00 01 18.1 0.0 12.3 SSS XXXXFFFF%% ..... 10.3 14.2 7.4 01 02 18.9 0.0 12.7 ASS XXXXFFFF%% %.... 10.7 14.9 7.6 02 03 19.4 0.0 13.0 ASS SXXXXFFFF% %%.... 11.1 15.3 7.7 03 04 19.7 0.0 13.1 ASS SXXXXFFFF% %%%.... 11.3 15.5 7.8 04 05 20.4 0.0 12.9 ASS SXXXXFFFFF %%%%.... 11.6 15.3 7.7 05 06 19.5 0.0 12.6 ASS SXXXFFFFF% %%%..... 11.4 14.8 7.5 06 07 18.5 0.0 12.0 SSS XXXFFFFF%% %%%..... 11.0 14.0 7.3 07 08 17.8 0.0 11.2 ASSS XXMFFFF%%% %%..... 10.9 12.6 6.8 08 09 17.0 0.0 10.0 SSSX MMMFFF%%%% %.... 10.7 10.6 6.2 09 10 16.2 0.0 7.7 SSMMM MMMFFF%%%% ..... 10.5 6.3 5.1 10 11 15.6 0.0 0.0 XXMMMMMMMM MMFFF%%%%% .... 10.4 2.1 0.0 11 12 15.2 0.0 0.0 XXMMMMMMMM MMFFF%%%%. .... 10.1 2.1 0.0 12 13 15.3 0.0 0.0 XXMMMMMMMM MMFFF%%%%. .... 9.8 2.1 0.0 13 14 15.3 0.0 0.0 XXMMMMMMMM MFFFF%%%%. .... 9.4 2.1 0.0 14 15 15.6 0.0 0.0 XXMMMMMMMM MFFFF%%%%. .... 9.4 2.1 0.0 15 16 15.3 0.0 0.0 XXMMMMMMMM MFFFF%%%%. .... 9.2 2.1 0.0 16 17 14.2 0.0 0.0 XXMMMMMMMM FFFF%%%%.. .. 8.7 2.1 0.0 17 18 12.4 0.0 0.0 XXMMMMMMMM FF%%%%.... 7.9 2.1 0.0 18 19 11.6 0.0 0.0 XXMMMMMMMF F%%%%..... 7.4 2.1 0.0 19 20 10.3 0.0 0.0 XXMMMMMMFF %%%%.... 6.9 2.1 0.0 20 21 10.5 0.0 0.0 XXMMMMMMFF %%%%.... 6.9 2.1 0.0 21 22 13.6 0.0 8.7 SSSXM FFF%%%%... . 8.5 9.2 5.3 22 23 15.7 0.0 10.5 SSSX XFFFF%%%.. .. 9.5 11.6 6.3 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) 27-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000