SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 4 December, 2025 T-index: 70 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 22-31 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 16.0 0.0 10.7 SSXX XXFFF%%%.. .. 8.8 12.5 6.4 00 01 17.2 0.0 11.4 ASSX XXXFFFF%%. ... 9.4 13.5 6.8 01 02 18.0 0.0 11.8 ASSX XXXXFFF%%% ..... 9.9 14.2 7.0 02 03 18.5 0.0 12.0 SSS XXXXFFFF%% %...... 10.4 14.6 7.2 03 04 18.6 0.0 12.1 SSS XXXXFFFF%% %%...... 10.8 14.7 7.2 04 05 19.2 0.0 12.0 SSS SXXXFFFFF% %%%...... 11.1 14.6 7.1 05 06 18.8 0.0 11.7 ASSS XXXXFFFF%% %%%...... 11.0 14.1 7.0 06 07 17.8 0.0 11.1 ASSS XXXFFFF%%% %%%..... 10.7 13.3 6.7 07 08 16.9 0.0 10.4 SSSS XMMFFF%%%% %...... 10.4 12.0 6.3 08 09 16.4 0.0 9.2 ASSSM MMMFFF%%%% %..... 10.5 10.0 5.7 09 10 14.9 0.0 7.0 ASMMMM MMMF%%%%%% ..... 9.9 5.7 4.7 10 11 14.0 0.0 0.0 XMMMMMMMMM MMF%%%%%%. ..... 9.6 1.8 0.0 11 12 13.1 0.0 0.0 XMMMMMMMMM MFF%%%%%.. .... 9.0 1.8 0.0 12 13 12.6 0.0 0.0 XMMMMMMMMM FF%%%%%... ... 8.3 1.8 0.0 13 14 12.8 0.0 0.0 XMMMMMMMMM FF%%%%%... .. 8.1 1.8 0.0 14 15 13.3 0.0 0.0 XMMMMMMMMM FFF%%%%... .. 8.2 1.8 0.0 15 16 13.2 0.0 0.0 XMMMMMMMMM FFF%%%%... .. 8.1 1.8 0.0 16 17 11.9 0.0 0.0 XMMMMMMMMF F%%%%..... 7.6 1.8 0.0 17 18 10.2 0.0 0.0 XMMMMMMMMF %%%%..... 7.3 1.8 0.0 18 19 9.2 0.0 0.0 XMMMMMMMF% %%%...... 7.0 1.8 0.0 19 20 8.6 0.0 0.0 XMMMMMMM%% %%...... 6.6 1.8 0.0 20 21 9.0 0.0 0.0 XMMMMMMM%% %%%...... 7.0 1.8 0.0 21 22 12.1 0.0 8.0 ASSXMM FF%%%%.... . 8.3 8.6 4.9 22 23 14.2 0.0 9.7 ASSXX MFFF%%%%.. . 8.5 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) 4-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000