SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 12 December, 2025 T-index: 110 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 22-33 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 16.7 0.0 11.5 ASSX XXXFFF%%%% .... 9.7 13.1 6.9 00 01 18.0 0.0 12.2 SSS XXXXFFF%%% %.... 10.3 14.1 7.3 01 02 18.8 0.0 12.6 ASS XXXXFFFF%% %.... 10.7 14.8 7.5 02 03 19.3 0.0 12.9 ASS XXXXXFFFF% %%.... 10.9 15.2 7.7 03 04 19.8 0.0 12.9 ASS SXXXXFFFF% %%%.... 11.2 15.4 7.7 04 05 20.5 0.0 12.8 ASS SXXXXFFFFF %%%%.... 11.5 15.3 7.6 05 06 19.5 0.0 12.5 ASS SXXXFFFFF% %%%..... 11.2 14.8 7.5 06 07 18.7 0.0 11.9 SSS XXXMFFFF%% %%%..... 11.0 13.9 7.2 07 08 18.0 0.0 11.1 ASSS XXMFFFF%%% %%..... 10.8 12.6 6.8 08 09 17.3 0.0 9.9 SSSX MMMFFFF%%% %..... 10.8 10.5 6.1 09 10 16.4 0.0 7.6 SSMMM MMMFFF%%%% %.... 10.6 6.2 5.1 10 11 15.5 0.0 0.0 XMMMMMMMMM MMFFF%%%%% .... 10.4 2.0 0.0 11 12 15.1 0.0 0.0 XMMMMMMMMM MMFFF%%%%. .... 10.0 2.0 0.0 12 13 15.2 0.0 0.0 XMMMMMMMMM MFFFF%%%%. .... 9.5 2.0 0.0 13 14 15.4 0.0 0.0 XMMMMMMMMM MFFFF%%%%. .... 9.3 2.0 0.0 14 15 15.7 0.0 0.0 XMMMMMMMMM MFFFF%%%%. .... 9.3 2.0 0.0 15 16 15.5 0.0 0.0 XMMMMMMMMM MFFFF%%%%. .... 9.2 2.0 0.0 16 17 14.1 0.0 0.0 XMMMMMMMMM FFFF%%%... .. 8.6 2.0 0.0 17 18 12.5 0.0 0.0 XMMMMMMMMM FF%%%%.... . 8.0 2.0 0.0 18 19 11.7 0.0 0.0 XMMMMMMMMF F%%%%..... 7.5 2.0 0.0 19 20 10.7 0.0 0.0 XMMMMMMMMF %%%%..... 7.1 2.0 0.0 20 21 11.0 0.0 0.0 XMMMMMMMMF %%%%%.... 7.2 2.0 0.0 21 22 14.0 0.0 8.6 SSSXM MFF%%%%%.. .. 8.7 9.1 5.3 22 23 15.9 0.0 10.4 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) 12-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000