SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 18 February, 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 12-19 1E 2 1 5 10 15 20 25 30 35 40 2F 29-38 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.2 15.3 9.0 SSSXX MBBBP%%... 8.7 10.1 5.2 00 01 15.1 16.8 9.7 ASSSX XBBBBP%%.. .. 9.2 11.1 5.7 01 02 15.7 17.8 10.1 ASSSX XMBBBPP%%. .. 9.6 11.8 5.9 02 03 16.7 18.4 10.4 SSSS XXBBBBPP%% .... 10.1 12.2 6.1 03 04 16.9 18.5 10.5 SSSS XXBBBBPP%% .... 10.3 12.3 6.1 04 05 17.3 18.4 10.4 SSSS XXBBBBBP%% .... 10.4 12.3 6.1 05 06 17.3 17.9 10.2 ASSSS XMMBBBB%%% %.... 10.4 12.0 5.9 06 07 16.8 16.9 9.7 ASSSX XMMBBB%%%% %.... 10.2 11.4 5.7 07 08 16.1 15.5 9.1 SSSSX MMBBBF%%%% .... 9.9 10.4 5.3 08 09 15.4 13.3 8.0 ASSXMM MMBFF%%%%. ... 9.6 8.8 4.7 09 10 14.4 9.3 5.9 ASMMMMM MFFF%%%%.. ... 9.3 5.4 3.7 10 11 13.1 2.4 0.0 XMMMMMMMMM MFF%%%%... .. 8.8 1.6 0.0 11 12 12.0 2.4 0.0 XMMMMMMMMM F%%%%%.... 8.1 1.6 0.0 12 13 11.3 2.4 0.0 XMMMMMMMMF F%%%%.... 7.6 1.6 0.0 13 14 10.4 2.4 0.0 XMMMMMMMFF %%%.... 7.0 1.6 0.0 14 15 10.3 2.4 0.0 XMMMMMMMFF %%%.... 6.9 1.6 0.0 15 16 10.4 2.4 0.0 XMMMMMMMFF %%%.... 6.8 1.6 0.0 16 17 10.1 2.4 0.0 XMMMMMMMFF %%%... 6.7 1.6 0.0 17 18 8.9 2.4 0.0 XMMMMMMF%% %%.... 6.3 1.6 0.0 18 19 8.0 2.4 0.0 XMMMMMM%%% %.... 6.0 1.6 0.0 19 20 7.1 2.4 0.0 XMMMMMF%%% ... 5.4 1.6 0.0 20 21 6.7 2.4 0.0 XMMMMM%%%. .. 5.2 1.6 0.0 21 22 9.0 8.5 5.5 SSMMB%% %.... 6.1 5.3 3.3 22 23 12.8 13.1 7.8 ASSXMB BBP%%... 7.7 8.6 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) 18-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000