SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 13 July, 2025 T-index: 75 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-9 1E 0 1 5 10 15 20 25 30 35 40 2F 21-25 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.1 0.0 9.1 ASSSM MMMMFFFFF% %%.... 12.0 9.7 5.7 00 01 20.5 0.0 10.1 SSSS XMMMMFFFFF %%%%.... 13.1 11.5 6.2 01 02 20.4 0.0 10.7 ASSS XXMMMFFFFF %%%%..... 13.6 12.6 6.6 02 03 19.9 0.0 11.1 ASSS SXXMMFFFF% %%%%..... 13.5 13.1 6.7 03 04 18.6 0.0 11.1 ASSS SXXMMFFF%% %%...... 13.0 13.3 6.7 04 05 18.5 0.0 11.0 ASSS XXXMMFFF%% %%..... 12.6 13.2 6.6 05 06 17.9 0.0 10.5 SSSS XXMMFFF%%% %%..... 12.2 12.6 6.3 06 07 17.8 0.0 9.8 ASSSX XMMMFFF%%% %%...... 12.0 11.6 5.8 07 08 17.5 0.0 8.5 SSSXM MMMMFFF%%% %...... 12.0 9.7 5.1 08 09 16.5 0.0 5.0 SMMMMMM MMMMFF%%%% ...... 11.5 4.0 3.3 09 10 12.8 0.0 0.0 XMMMMMMMMM MF%%%%.... .. 9.2 1.9 0.0 10 11 9.7 0.0 0.0 XMMMMMMMM% %%%...... 7.2 1.9 0.0 11 12 8.5 0.0 0.0 XMMMMMMM%% %..... 6.3 1.9 0.0 12 13 7.9 0.0 0.0 XMMMMMM%%% ..... 5.8 1.9 0.0 13 14 7.4 0.0 0.0 XMMMMMM%%% .... 5.5 1.9 0.0 14 15 7.1 0.0 0.0 XMMMMMF%%. ... 5.3 1.9 0.0 15 16 7.0 0.0 0.0 XMMMMM%%%. ... 5.4 1.9 0.0 16 17 6.8 0.0 0.0 XMMMMM%%%. ... 5.3 1.9 0.0 17 18 6.4 0.0 0.0 XMMMMM%%%. ... 5.0 1.9 0.0 18 19 6.1 0.0 0.0 XMMMMM%%%. ... 4.5 1.9 0.0 19 20 5.6 0.0 0.0 XMMMM%%%.. .. 4.0 1.9 0.0 20 21 5.6 0.0 0.0 XMMMM%%%.. .. 4.3 1.9 0.0 21 22 8.0 0.0 0.0 XMMMMMF%%% .... 5.4 1.9 0.0 22 23 14.6 0.0 6.9 ASMMMM FFFF%%%... 8.7 5.2 4.7 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-Jul-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000