SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 7 March, 2026 T-index: 115 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 13-18 1E 2 1 5 10 15 20 25 30 35 40 2F 29-37 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.4 15.3 9.1 SSSSX MMBBBFF%%% .. 10.7 10.1 5.3 00 01 19.0 16.9 9.9 ASSSX XMMBBBFF%% %.... 11.5 11.2 5.8 01 02 19.6 18.0 10.4 SSSS XMMMBBBBF% %%... 11.8 11.9 6.1 02 03 20.2 18.6 10.7 SSSS XXMMBBBBFF %%... 12.2 12.3 6.2 03 04 20.3 18.8 10.8 SSSS XXMMBBBBFF %%.... 12.3 12.5 6.3 04 05 20.6 18.6 10.7 SSSS XXMMBBBBFF %%%... 12.4 12.4 6.2 05 06 20.4 18.0 10.4 ASSSS XXMMBBBBFF %%%.... 12.4 12.1 6.0 06 07 19.9 17.1 9.9 ASSSX XMMMBBBFF% %%%... 12.1 11.4 5.8 07 08 19.6 15.5 9.2 SSSSX MMMMBFFFF% %%.... 11.8 10.4 5.4 08 09 18.9 13.1 8.0 ASSXMM MMMFFFFF%% %%... 11.6 8.6 4.7 09 10 17.1 7.8 5.2 SSMMMMM MMMFFFF%%% ..... 11.0 4.0 3.4 10 11 15.6 2.5 0.0 XMMMMMMMMM MMFFF%%%%. .... 10.3 1.7 0.0 11 12 13.6 2.5 0.0 XMMMMMMMMM MFF%%%.... . 9.2 1.7 0.0 12 13 12.9 2.5 0.0 XMMMMMMMMM FF%%%%.... 8.6 1.7 0.0 13 14 11.5 2.5 0.0 XMMMMMMMMF F%%%.... 7.7 1.7 0.0 14 15 11.3 2.5 0.0 XMMMMMMMMF F%%%.... 7.4 1.7 0.0 15 16 11.1 2.5 0.0 XMMMMMMMMF F%%%.... 7.2 1.7 0.0 16 17 11.1 2.5 0.0 XMMMMMMMFF F%%%.... 7.1 1.7 0.0 17 18 9.9 2.5 0.0 XMMMMMMMF% %%..... 6.7 1.7 0.0 18 19 9.1 2.5 0.0 XMMMMMMMF% %%.... 6.4 1.7 0.0 19 20 7.9 2.5 0.0 XMMMMMM%%% .... 5.8 1.7 0.0 20 21 7.4 2.5 0.0 XMMMMMF%%% ... 5.6 1.7 0.0 21 22 10.2 6.4 4.4 ASMMMMFF %%... 6.7 0.0 2.9 22 23 15.6 12.8 7.8 ASSXMM BBFFF%%%.. 9.2 8.3 4.6 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) 7-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000