SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 6 February, 2026 T-index: 130 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 29-40 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.2 16.1 9.6 ASSSX MBBBBP%... . 9.3 10.6 5.6 00 01 16.2 17.5 10.3 ASSSX XBBBBBP%.. .. 9.8 11.6 6.0 01 02 16.4 18.5 10.8 SSSS XXBBBBPP%. .. 10.1 12.3 6.3 02 03 17.4 19.1 11.1 SSSS XXBBBBBPP% ... 10.4 12.7 6.4 03 04 17.6 19.3 11.2 ASSS XXMBBBBPP% ... 10.7 12.8 6.5 04 05 18.0 19.1 11.1 SSSS XXMBBBBPP% .... 10.8 12.8 6.4 05 06 17.8 18.6 10.8 SSSS XXMBBBBP%% %.... 10.9 12.4 6.3 06 07 17.1 17.7 10.4 ASSSS XMMBBBB%%% %.... 10.6 11.9 6.0 07 08 16.1 16.3 9.7 ASSSX MMBBBB%%%% .... 10.2 10.8 5.7 08 09 15.6 14.1 8.6 SSSXM MMBBF%%%%. ... 9.8 9.3 5.1 09 10 15.2 10.4 6.7 SSMMMM MMFFF%%%.. .. 9.9 6.3 4.1 10 11 14.6 2.6 0.0 XMMMMMMMMM MFFF%%%%.. . 9.9 1.8 0.0 11 12 13.7 2.6 0.0 XMMMMMMMMM MFF%%%%... 9.4 1.8 0.0 12 13 13.4 2.6 0.0 XMMMMMMMMM FFF%%%... 9.2 1.8 0.0 13 14 12.3 2.6 0.0 XMMMMMMMMM FF%%%... 8.2 1.8 0.0 14 15 12.1 2.6 0.0 XMMMMMMMMF FF%%%... 8.0 1.8 0.0 15 16 12.3 2.6 0.0 XMMMMMMMMF FF%%%... 7.8 1.8 0.0 16 17 11.7 2.6 0.0 XMMMMMMMMF F%%%.... 7.6 1.8 0.0 17 18 10.5 2.6 0.0 XMMMMMMMFF %%%... 6.8 1.8 0.0 18 19 9.8 2.6 0.0 XMMMMMMMF% %%... 6.2 1.8 0.0 19 20 8.6 2.6 0.0 XMMMMMMF%% %.. 5.6 1.8 0.0 20 21 8.2 2.6 0.0 XMMMMMMF%% ... 5.4 1.8 0.0 21 22 10.7 9.7 6.3 ASSMMBF %%%... 6.7 6.3 3.7 22 23 14.0 13.8 8.5 ASSSXM BBB%%%... 8.4 9.1 5.0 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) 6-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000