SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 17 December, 2025 T-index: 95 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 22-33 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 16.5 0.0 11.2 ASSX XXFFFF%%%. ... 9.2 12.9 6.7 00 01 17.7 0.0 11.9 SSX XXXFFFF%%% .... 9.8 13.9 7.1 01 02 18.5 0.0 12.3 SSS XXXXFFFF%% %.... 10.3 14.6 7.4 02 03 19.0 0.0 12.6 ASS XXXXFFFF%% %%.... 10.7 15.0 7.5 03 04 19.1 0.0 12.6 ASS XXXXXFFFF% %%..... 11.0 15.1 7.5 04 05 19.9 0.0 12.5 ASS SXXXFFFFF% %%%...... 11.3 15.0 7.5 05 06 19.0 0.0 12.2 SSS SXXXFFFF%% %%%..... 11.1 14.5 7.3 06 07 18.3 0.0 11.6 ASSS XXXFFFFF%% %%%..... 10.8 13.7 7.0 07 08 17.4 0.0 10.8 ASSS XXMFFFF%%% %%..... 10.7 12.4 6.6 08 09 16.7 0.0 9.6 ASSSX MMMFFF%%%% %..... 10.7 10.4 6.0 09 10 15.5 0.0 7.4 ASSMMM MMMFF%%%%% ..... 10.2 6.1 5.0 10 11 14.8 0.0 0.0 XMMMMMMMMM MMFF%%%%%. ..... 9.9 2.0 0.0 11 12 14.4 0.0 0.0 XMMMMMMMMM MMFF%%%%%. .... 9.6 2.0 0.0 12 13 14.4 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.2 2.0 0.0 13 14 14.6 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 8.9 2.0 0.0 14 15 15.0 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.0 2.0 0.0 15 16 14.8 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 8.9 2.0 0.0 16 17 13.5 0.0 0.0 XMMMMMMMMM FFF%%%%... .. 8.3 2.0 0.0 17 18 11.7 0.0 0.0 XMMMMMMMMF F%%%%..... 7.8 2.0 0.0 18 19 10.8 0.0 0.0 XMMMMMMMMF %%%%%..... 7.5 2.0 0.0 19 20 9.7 0.0 0.0 XMMMMMMMF% %%%..... 7.0 2.0 0.0 20 21 10.0 0.0 0.0 XMMMMMMMF% %%%%..... 7.2 2.0 0.0 21 22 12.9 0.0 8.4 SSSMM FF%%%%%... . 8.5 9.0 5.1 22 23 14.8 0.0 10.1 SSXX XFFF%%%%.. .. 9.0 11.4 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) 17-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000