SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 9 December, 2025 T-index: 90 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-14 1E 0 1 5 10 15 20 25 30 35 40 2F 22-32 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 16.4 0.0 11.1 ASSX XXFFFF%%%. ... 9.2 12.8 6.6 00 01 17.6 0.0 11.8 ASSX XXXFFFF%%% .... 9.7 13.8 7.0 01 02 18.4 0.0 12.2 SSS XXXXFFFF%% %.... 10.2 14.5 7.3 02 03 18.9 0.0 12.5 SSS XXXXFFFF%% %%..... 10.7 14.9 7.4 03 04 19.0 0.0 12.5 SSS XXXXXFFF%% %%%..... 11.0 15.1 7.4 04 05 19.8 0.0 12.4 SSS SXXXFFFFF% %%%%..... 11.4 14.9 7.4 05 06 19.1 0.0 12.1 SSS SXXXFFFFF% %%%...... 11.2 14.5 7.2 06 07 18.3 0.0 11.5 ASSS XXXFFFFF%% %%%..... 10.9 13.6 7.0 07 08 17.4 0.0 10.7 ASSS XXMFFFF%%% %%..... 10.7 12.3 6.5 08 09 16.8 0.0 9.5 ASSSX MMMFFF%%%% %..... 10.7 10.3 5.9 09 10 15.7 0.0 7.3 ASSMMM MMMFF%%%%% ..... 10.2 6.0 4.9 10 11 14.7 0.0 0.0 XMMMMMMMMM MMFF%%%%%. ..... 9.9 1.9 0.0 11 12 14.0 0.0 0.0 XMMMMMMMMM MMF%%%%%%. .... 9.4 1.9 0.0 12 13 13.8 0.0 0.0 XMMMMMMMMM MFF%%%%%.. ... 8.9 1.9 0.0 13 14 13.9 0.0 0.0 XMMMMMMMMM MFF%%%%%.. ... 8.6 1.9 0.0 14 15 14.4 0.0 0.0 XMMMMMMMMM MFFF%%%%.. ... 8.7 1.9 0.0 15 16 14.3 0.0 0.0 XMMMMMMMMM MFFF%%%%.. ... 8.6 1.9 0.0 16 17 13.0 0.0 0.0 XMMMMMMMMM FF%%%%.... . 8.0 1.9 0.0 17 18 11.2 0.0 0.0 XMMMMMMMMF F%%%%..... 7.6 1.9 0.0 18 19 10.2 0.0 0.0 XMMMMMMMMF %%%%...... 7.4 1.9 0.0 19 20 9.4 0.0 0.0 XMMMMMMMF% %%%..... 7.0 1.9 0.0 20 21 9.8 0.0 0.0 XMMMMMMMF% %%%%..... 7.2 1.9 0.0 21 22 12.8 0.0 8.3 SSSMM FF%%%%%... .. 8.5 8.9 5.1 22 23 14.8 0.0 10.0 SSXX XFFF%%%%.. .. 8.9 11.3 6.1 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) 9-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000