SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 6 December, 2025 T-index: 105 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 8-14 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 16.6 0.0 11.3 ASSX XXFFFF%%%% .... 9.7 13.0 6.8 00 01 17.9 0.0 12.1 SSS XXXFFFF%%% %.... 10.1 14.0 7.2 01 02 18.7 0.0 12.5 ASS XXXXFFFF%% %.... 10.5 14.7 7.5 02 03 19.2 0.0 12.8 ASS XXXXXFFFF% %%..... 11.0 15.2 7.6 03 04 19.6 0.0 12.8 ASS SXXXXFFFF% %%%..... 11.3 15.3 7.6 04 05 20.3 0.0 12.7 ASS SXXXXFFFFF %%%%..... 11.6 15.2 7.6 05 06 19.6 0.0 12.4 SSS SXXXFFFFF% %%%%..... 11.4 14.7 7.4 06 07 18.7 0.0 11.8 SSS XXXMFFFF%% %%%..... 11.0 13.8 7.1 07 08 17.9 0.0 11.0 ASSS XXMFFFF%%% %%..... 10.8 12.5 6.7 08 09 17.4 0.0 9.8 SSSX MMMFFFF%%% %%.... 10.8 10.4 6.1 09 10 16.3 0.0 7.5 ASSMMM MMMFFF%%%% %.... 10.5 6.0 5.0 10 11 15.4 0.0 0.0 XMMMMMMMMM MMMFF%%%%% ..... 10.3 2.0 0.0 11 12 14.8 0.0 0.0 XMMMMMMMMM MMFF%%%%%. .... 9.8 2.0 0.0 12 13 14.6 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.3 2.0 0.0 13 14 14.8 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.0 2.0 0.0 14 15 15.0 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.0 2.0 0.0 15 16 14.9 0.0 0.0 XMMMMMMMMM MFFF%%%%%. ... 9.0 2.0 0.0 16 17 13.6 0.0 0.0 XMMMMMMMMM FFF%%%%... . 8.3 2.0 0.0 17 18 11.9 0.0 0.0 XMMMMMMMMF F%%%%%.... 7.8 2.0 0.0 18 19 11.1 0.0 0.0 XMMMMMMMMF F%%%%..... 7.4 2.0 0.0 19 20 10.4 0.0 0.0 XMMMMMMMFF %%%%.... 7.0 2.0 0.0 20 21 10.7 0.0 0.0 XMMMMMMMMF %%%%..... 7.3 2.0 0.0 21 22 13.8 0.0 8.5 SSSMM MFF%%%%%.. .. 8.7 9.0 5.2 22 23 15.8 0.0 10.3 SSSX XFFFF%%%%. ... 9.4 11.5 6.2 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) 6-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000