SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 20 February, 2026 T-index: 98 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 14.5 15.4 9.0 SSSXX MBBBP%%... . 9.0 10.1 5.3 00 01 15.4 16.9 9.7 ASSSX XBBBBP%%%. .. 9.5 11.2 5.7 01 02 16.0 17.8 10.2 ASSSX XMBBBPP%%. ... 9.8 11.8 5.9 02 03 17.2 18.4 10.5 SSSS XXBBBBBP%% .... 10.3 12.2 6.1 03 04 17.4 18.6 10.6 SSSS XXBBBBBP%% .... 10.5 12.4 6.1 04 05 17.8 18.4 10.5 SSSS XXMBBBBP%% %.... 10.6 12.3 6.1 05 06 17.8 17.9 10.2 ASSSS XMMBBBB%%% %.... 10.7 12.0 5.9 06 07 17.2 17.0 9.8 ASSSX XMMBBBB%%% %.... 10.5 11.4 5.7 07 08 16.6 15.5 9.1 SSSSX MMBBBF%%%% .... 10.2 10.4 5.3 08 09 15.8 13.3 8.0 ASSXMM MMBFF%%%%. ... 9.9 8.8 4.7 09 10 14.6 9.1 5.8 ASMMMMM MMFF%%%%.. ... 9.5 5.3 3.6 10 11 13.3 2.4 0.0 XMMMMMMMMM MFF%%%%... .. 8.9 1.6 0.0 11 12 12.1 2.4 0.0 XMMMMMMMMM FF%%%%.... 8.2 1.6 0.0 12 13 11.4 2.4 0.0 XMMMMMMMMF F%%%%.... 7.7 1.6 0.0 13 14 10.4 2.4 0.0 XMMMMMMMMF %%%.... 7.0 1.6 0.0 14 15 10.5 2.4 0.0 XMMMMMMMFF %%%.... 6.9 1.6 0.0 15 16 10.6 2.4 0.0 XMMMMMMMFF %%%.... 6.9 1.6 0.0 16 17 10.3 2.4 0.0 XMMMMMMMFF %%%.... 6.7 1.6 0.0 17 18 9.1 2.4 0.0 XMMMMMMMF% %%.... 6.3 1.6 0.0 18 19 8.1 2.4 0.0 XMMMMMMF%% %.... 6.0 1.6 0.0 19 20 7.2 2.4 0.0 XMMMMMF%%% ... 5.5 1.6 0.0 20 21 6.8 2.4 0.0 XMMMMM%%%. .. 5.2 1.6 0.0 21 22 9.0 8.3 5.4 SSMMB%% %%... 6.2 5.2 3.3 22 23 13.0 13.0 7.8 ASSXMB BBP%%%... 7.9 8.5 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) 20-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000