SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 13 December, 2025 T-index: 65 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-13 1E 0 1 5 10 15 20 25 30 35 40 2F 21-31 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.9 0.0 10.6 SSXX XXFFF%%%.. . 8.7 12.5 6.4 00 01 17.1 0.0 11.3 ASSX XXXFFFF%%. ... 9.4 13.5 6.7 01 02 17.9 0.0 11.7 ASSX XXXXFFF%%% .... 9.9 14.1 7.0 02 03 18.3 0.0 11.9 SSS XXXXFFFF%% %..... 10.2 14.5 7.1 03 04 18.5 0.0 12.0 SSS XXXXFFFF%% %%..... 10.5 14.6 7.1 04 05 18.7 0.0 11.9 SSS XXXXFFFF%% %%%...... 10.9 14.5 7.1 05 06 18.3 0.0 11.6 ASSS XXXXFFFF%% %%%...... 10.8 14.1 6.9 06 07 17.8 0.0 11.0 ASSS XXXFFFF%%% %%%..... 10.7 13.2 6.7 07 08 16.7 0.0 10.3 SSSS XMMFFF%%%% %...... 10.5 12.0 6.3 08 09 16.0 0.0 9.1 ASSSM MMMFF%%%%% ...... 10.5 10.0 5.7 09 10 14.6 0.0 7.0 ASMMMM MMFF%%%%%. ..... 9.7 5.9 4.7 10 11 13.8 0.0 0.0 XMMMMMMMMM MMF%%%%%%. ..... 9.4 1.8 0.0 11 12 13.1 0.0 0.0 XMMMMMMMMM MFF%%%%%.. ... 8.9 1.8 0.0 12 13 12.7 0.0 0.0 XMMMMMMMMM MF%%%%%... ... 8.3 1.8 0.0 13 14 13.0 0.0 0.0 XMMMMMMMMM FF%%%%%... .. 8.2 1.8 0.0 14 15 13.4 0.0 0.0 XMMMMMMMMM FFF%%%%... .. 8.2 1.8 0.0 15 16 13.1 0.0 0.0 XMMMMMMMMM FFF%%%%... .. 8.1 1.8 0.0 16 17 11.9 0.0 0.0 XMMMMMMMMF F%%%%..... 7.5 1.8 0.0 17 18 10.4 0.0 0.0 XMMMMMMMMF %%%%..... 7.3 1.8 0.0 18 19 9.3 0.0 0.0 XMMMMMMMF% %%%...... 7.1 1.8 0.0 19 20 8.6 0.0 0.0 XMMMMMMM%% %%..... 6.5 1.8 0.0 20 21 8.9 0.0 0.0 XMMMMMMM%% %%%..... 6.9 1.8 0.0 21 22 11.7 0.0 8.0 ASSXMM F%%%%%.... . 8.1 8.7 4.9 22 23 14.2 0.0 9.6 ASSXX MFFF%%%... 8.4 11.0 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) 13-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000