SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 14 March, 2026 T-index: 100 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-18 1E 2 1 5 10 15 20 25 30 35 40 2F 29-36 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.0 14.9 8.8 SSSXM MMBBFF%%%. .. 10.7 9.8 5.2 00 01 18.8 16.6 9.6 ASSSX MMMBBBFF%% %%.. 11.5 10.9 5.6 01 02 19.4 17.6 10.1 ASSSS XMMMBBBFF% %%... 11.8 11.6 5.9 02 03 20.1 18.2 10.4 SSSS XXMMBBBBFF %%... 12.1 12.1 6.1 03 04 20.3 18.4 10.5 SSSS XXMMBBBBFF %%.... 12.3 12.2 6.1 04 05 20.5 18.2 10.4 ASSSS XXMMBBBBFF %%%... 12.4 12.1 6.0 05 06 20.2 17.7 10.1 ASSSS XMMMBBBFFF %%%... 12.2 11.8 5.9 06 07 19.5 16.7 9.6 ASSSX XMMMBBFFF% %%%... 11.8 11.2 5.6 07 08 19.4 15.1 8.9 SSSXX MMMMBFFFF% %%.... 11.6 10.1 5.2 08 09 18.9 12.6 7.6 ASSXMM MMMMFFFF%% %%.... 11.5 8.3 4.5 09 10 16.6 6.6 4.5 ASMMMMMM MMMFFF%%%% ..... 10.4 0.0 3.0 10 11 14.3 2.5 0.0 XMMMMMMMMM MMFF%%%%.. .... 9.5 1.6 0.0 11 12 12.2 2.5 0.0 XMMMMMMMMM FF%%%%.... 8.4 1.6 0.0 12 13 11.5 2.5 0.0 XMMMMMMMMF F%%%%.... 7.7 1.6 0.0 13 14 10.4 2.5 0.0 XMMMMMMMMF %%%..... 7.1 1.6 0.0 14 15 10.4 2.5 0.0 XMMMMMMMFF %%%..... 6.9 1.6 0.0 15 16 10.1 2.5 0.0 XMMMMMMMFF %%%.... 6.8 1.6 0.0 16 17 10.2 2.5 0.0 XMMMMMMMFF %%%.... 6.6 1.6 0.0 17 18 9.2 2.5 0.0 XMMMMMMMF% %%.... 6.3 1.6 0.0 18 19 8.6 2.5 0.0 XMMMMMMF%% %.... 6.1 1.6 0.0 19 20 7.3 2.5 0.0 XMMMMMF%%% ... 5.4 1.6 0.0 20 21 6.8 2.5 0.0 XMMMMM%%%. .. 5.1 1.6 0.0 21 22 9.7 4.3 3.1 AMMMMFF% %%... 6.3 0.0 2.5 22 23 15.3 12.3 7.5 SSSMMM BBFFF%%... 9.2 7.9 4.4 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) 14-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000