SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 25 December, 2025 T-index: 100 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 16.6 0.0 11.3 ASSX XXFFFF%%%. .. 9.3 13.0 6.8 00 01 17.8 0.0 12.0 SSX XXXFFFF%%% .... 9.8 14.0 7.2 01 02 18.6 0.0 12.4 SSS XXXXFFFF%% %.... 10.3 14.7 7.4 02 03 19.1 0.0 12.7 ASS XXXXXFFFF% %%.... 10.7 15.1 7.5 03 04 19.2 0.0 12.7 ASS XXXXXFFFF% %%%.... 11.0 15.2 7.6 04 05 19.9 0.0 12.6 ASS SXXXXFFFF% %%%..... 11.3 15.1 7.5 05 06 19.3 0.0 12.3 SSS SXXXFFFFF% %%%..... 11.1 14.6 7.4 06 07 18.4 0.0 11.7 SSS XXXFFFFF%% %%%..... 10.8 13.7 7.1 07 08 17.6 0.0 10.9 ASSS XXMFFFF%%% %%..... 10.6 12.4 6.7 08 09 16.9 0.0 9.7 ASSSX MMMFFF%%%% %..... 10.5 10.4 6.0 09 10 15.7 0.0 7.5 ASSMMM MMMFF%%%%% ..... 10.2 6.2 5.0 10 11 14.9 0.0 0.0 XMMMMMMMMM MMFF%%%%%. .... 10.0 2.0 0.0 11 12 14.5 0.0 0.0 XMMMMMMMMM MMFF%%%%%. .... 9.7 2.0 0.0 12 13 14.5 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.3 2.0 0.0 13 14 14.6 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.0 2.0 0.0 14 15 14.9 0.0 0.0 XMMMMMMMMM MFFF%%%%%. .... 9.0 2.0 0.0 15 16 14.6 0.0 0.0 XMMMMMMMMM MFFF%%%%.. ... 8.8 2.0 0.0 16 17 13.5 0.0 0.0 XMMMMMMMMM FFF%%%%... .. 8.3 2.0 0.0 17 18 11.8 0.0 0.0 XMMMMMMMMF F%%%%..... 7.8 2.0 0.0 18 19 10.8 0.0 0.0 XMMMMMMMMF %%%%%..... 7.4 2.0 0.0 19 20 9.6 0.0 0.0 XMMMMMMMF% %%%..... 6.9 2.0 0.0 20 21 9.9 0.0 0.0 XMMMMMMMF% %%%..... 7.0 2.0 0.0 21 22 12.8 0.0 8.5 SSSXM FF%%%%%... . 8.4 9.1 5.2 22 23 14.9 0.0 10.2 SSSX XFFF%%%%.. .. 9.1 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) 25-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000