SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 28 March, 2026 T-index: 95 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-17 1E 2 1 5 10 15 20 25 30 35 40 2F 29-35 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 18.0 14.5 8.5 ASSSXM MMMBFFF%%% %.. 11.4 9.4 5.0 00 01 19.8 16.2 9.3 ASSSX MMMMBBFFF% %%%... 12.2 10.6 5.5 01 02 20.7 17.3 9.9 ASSSX XMMMBBBFFF %%%.... 12.5 11.4 5.8 02 03 21.3 17.9 10.2 ASSSS XMMMMBBFFF F%%%... 12.8 11.8 5.9 03 04 21.5 18.1 10.3 ASSSS XMMMMBBBFF F%%%... 12.9 12.0 6.0 04 05 21.5 17.9 10.2 ASSSS XMMMMBBFFF F%%%... 13.0 11.9 5.9 05 06 20.9 17.4 9.9 ASSSX XMMMMBBFFF %%%%... 12.7 11.6 5.8 06 07 20.3 16.3 9.4 ASSSX MMMMMBFFFF %%%%... 12.4 10.9 5.5 07 08 19.9 14.7 8.6 ASSSXM MMMMFFFFF% %%%.... 12.1 9.9 5.0 08 09 19.6 12.0 7.3 SSSMMM MMMMFFFFF% %%%... 11.9 7.9 4.3 09 10 16.7 2.4 0.0 MMMMMMMMMM MMMFFF%%%% %..... 10.6 0.0 2.1 10 11 13.4 2.4 0.0 XMMMMMMMMM MFF%%%%%.. .... 9.1 1.6 0.0 11 12 11.6 2.4 0.0 XMMMMMMMMM F%%%%..... 8.1 1.6 0.0 12 13 10.5 2.4 0.0 XMMMMMMMMF %%%%..... 7.2 1.6 0.0 13 14 9.9 2.4 0.0 XMMMMMMMF% %%%.... 6.8 1.6 0.0 14 15 9.7 2.4 0.0 XMMMMMMMF% %%..... 6.6 1.6 0.0 15 16 9.5 2.4 0.0 XMMMMMMMF% %%..... 6.4 1.6 0.0 16 17 9.4 2.4 0.0 XMMMMMMMF% %%.... 6.3 1.6 0.0 17 18 8.8 2.4 0.0 XMMMMMMF%% %..... 6.1 1.6 0.0 18 19 8.2 2.4 0.0 XMMMMMMF%% %.... 5.8 1.6 0.0 19 20 7.2 2.4 0.0 XMMMMMF%%. ... 5.1 1.6 0.0 20 21 6.6 2.4 0.0 XMMMMM%%%. .. 4.8 1.6 0.0 21 22 8.9 2.4 0.0 XMMMMMMF%% %... 6.0 1.6 0.0 22 23 15.4 11.6 7.1 SSSMMM MFFFF%%%.. 9.3 7.4 4.3 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) 28-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000