SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 28 January, 2026 T-index: 120 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 13-21 1E 2 1 5 10 15 20 25 30 35 40 2F 29-41 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 13.9 16.0 9.5 ASSXX BBBPPP... 8.6 10.6 5.5 00 01 14.7 17.4 10.2 ASSSX XBBBPPP... . 9.1 11.6 5.9 01 02 15.4 18.4 10.7 SSSX XXBBBPPP.. . 9.6 12.2 6.2 02 03 16.5 18.9 10.9 SSSX XXBBBBPP%. .. 10.0 12.6 6.3 03 04 16.9 19.1 11.0 SSSS XXBBBBPPP. ... 10.3 12.7 6.4 04 05 17.3 19.0 10.9 SSSS XXBBBBBPP% ... 10.5 12.7 6.3 05 06 17.1 18.5 10.7 SSSS XXMBBBBP%% .... 10.5 12.4 6.2 06 07 16.2 17.6 10.3 ASSSS XMBBBBP%%% .... 10.1 11.8 6.0 07 08 15.4 16.2 9.6 ASSSX MMBBBP%%%. ... 9.8 10.8 5.6 08 09 14.9 14.2 8.6 SSSXM MBBB%%%%.. .. 9.4 9.3 5.1 09 10 14.4 10.7 6.8 SSMMMM MFFF%%%%.. . 9.3 6.5 4.2 10 11 13.6 2.6 0.0 XMMMMMMMMM MFF%%%%... . 9.3 1.7 0.0 11 12 12.9 2.6 0.0 XMMMMMMMMM FF%%%%.... 8.9 1.7 0.0 12 13 12.6 2.6 0.0 XMMMMMMMMM FF%%%%... 8.7 1.7 0.0 13 14 11.9 2.6 0.0 XMMMMMMMMF F%%%%... 8.0 1.7 0.0 14 15 12.1 2.6 0.0 XMMMMMMMMF FF%%%... 7.9 1.7 0.0 15 16 12.2 2.6 0.0 XMMMMMMMMF FF%%%... 7.7 1.7 0.0 16 17 11.6 2.6 0.0 XMMMMMMMMF F%%%.... 7.5 1.7 0.0 17 18 10.1 2.6 0.0 XMMMMMMMFF %%%... 6.8 1.7 0.0 18 19 9.3 2.6 0.0 XMMMMMMMF% %%... 6.2 1.7 0.0 19 20 8.1 2.6 0.0 XMMMMMMF%% ... 5.7 1.7 0.0 20 21 7.8 2.6 0.0 XMMMMMM%%% ... 5.5 1.7 0.0 21 22 10.3 10.1 6.5 ASSMMBB %%%... 6.7 6.7 3.8 22 23 13.1 13.9 8.4 ASSXXB BBB%%... 8.0 9.2 4.9 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-Jan-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000