SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 22 October, 2025 T-index: 115 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 13-20 1E 2 1 5 10 15 20 25 30 35 40 2F 29-39 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.7 15.6 9.3 SSSSX MMBBBFF%%% ... 10.7 10.3 5.4 00 01 18.2 17.1 10.0 ASSSX XMBBBBBF%% %... 11.0 11.3 5.8 01 02 18.5 18.1 10.5 SSSS XMMBBBBB%% %... 11.3 12.0 6.1 02 03 19.3 18.7 10.8 SSSS XXMBBBBBF% %... 11.7 12.4 6.3 03 04 20.0 18.9 10.9 SSSS XXMMBBBBF% %%... 12.0 12.6 6.3 04 05 19.9 18.7 10.8 SSSS XXMMBBBBF% %%... 12.2 12.5 6.3 05 06 19.1 18.2 10.5 SSSS XXMMBBBBF% %... 11.9 12.2 6.1 06 07 18.1 17.3 10.1 ASSSS XMMBBBBF%% %... 11.4 11.6 5.8 07 08 17.4 15.8 9.3 ASSSX MMMBBFF%%% ... 11.1 10.6 5.5 08 09 17.9 13.6 8.2 ASSSMM MMMFFFF%%% .... 11.2 8.9 4.9 09 10 16.4 9.3 6.0 ASMMMMM MMFFFF%%%. ... 10.8 5.4 3.8 10 11 15.0 2.5 0.0 XMMMMMMMMM MMFF%%%%.. ... 10.1 1.7 0.0 11 12 13.9 2.5 0.0 XMMMMMMMMM MFF%%%%... . 9.3 1.7 0.0 12 13 13.2 2.5 0.0 XMMMMMMMMM FFF%%%.... 8.7 1.7 0.0 13 14 12.7 2.5 0.0 XMMMMMMMMM FF%%%%.... 8.1 1.7 0.0 14 15 12.3 2.5 0.0 XMMMMMMMMF FF%%%..... 7.8 1.7 0.0 15 16 11.8 2.5 0.0 XMMMMMMMMF F%%%..... 7.4 1.7 0.0 16 17 11.1 2.5 0.0 XMMMMMMMFF F%%%.... 7.1 1.7 0.0 17 18 9.6 2.5 0.0 XMMMMMMMF% %%.... 6.7 1.7 0.0 18 19 8.4 2.5 0.0 XMMMMMMF%% %.... 6.2 1.7 0.0 19 20 8.1 2.5 0.0 XMMMMMMF%% .... 5.9 1.7 0.0 20 21 8.8 2.5 0.0 XMMMMMMF%% %.... 6.3 1.7 0.0 21 22 12.6 8.5 5.6 SSMMMMF FF%%%.... 8.0 5.3 3.4 22 23 16.5 13.3 8.1 ASSSMM MBBFFF%%%. . 9.9 8.7 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) 22-Oct-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000