SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 12 January, 2026 T-index: 30 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-20 1E 2 1 5 10 15 20 25 30 35 40 2F 28-39 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 12.2 14.5 8.2 ASXXXB BBPE. 6.7 9.7 4.7 00 01 13.2 15.8 8.7 SSXXX BBBEE 7.3 10.5 5.1 01 02 13.9 16.6 9.1 SSXXX BBBPEE. 7.7 11.0 5.3 02 03 14.3 17.1 9.3 SSXXX XBBBPEE.. 8.0 11.4 5.4 03 04 14.4 17.2 9.4 SSSXX XBBBPPE... . 8.3 11.5 5.4 04 05 14.3 17.1 9.3 SSSXX XBBBPPP... . 8.6 11.4 5.4 05 06 14.2 16.7 9.1 SSSXX XBBBPP%%.. .. 8.8 11.2 5.3 06 07 14.0 15.9 8.8 SSSXX BBBPP%%%.. .. 8.8 10.6 5.1 07 08 13.7 14.7 8.2 ASSSXM BBBP%%%... . 8.7 9.8 4.8 08 09 13.1 12.9 7.4 SSSXMM BBF%%%.... . 8.5 8.5 4.4 09 10 11.8 10.1 6.0 ASXMMMM F%%%%.... 8.1 6.2 3.7 10 11 10.3 2.0 0.0 XMMMMMMMMF %%%%.... 7.1 1.3 0.0 11 12 9.6 2.0 0.0 XMMMMMMMM% %%%.... 6.7 1.3 0.0 12 13 9.0 2.0 0.0 XMMMMMMM%% %%.... 6.6 1.3 0.0 13 14 8.8 2.0 0.0 XMMMMMMF%% %%... 6.2 1.3 0.0 14 15 8.9 2.0 0.0 XMMMMMMF%% %... 6.2 1.3 0.0 15 16 8.6 2.0 0.0 XMMMMMMF%% %... 6.0 1.3 0.0 16 17 8.4 2.0 0.0 XMMMMMMF%% %.. 5.7 1.3 0.0 17 18 7.1 2.0 0.0 XMMMMMF%%. .. 5.2 1.3 0.0 18 19 6.5 2.0 0.0 XMMMMF%%.. .. 4.8 1.3 0.0 19 20 5.5 2.0 0.0 XMMMM%%... 4.3 1.3 0.0 20 21 5.8 2.0 0.0 XMMMM%%... 4.4 1.3 0.0 21 22 8.1 9.6 5.8 SSXMBP% ... 5.7 6.4 3.4 22 23 10.6 12.7 7.3 SSXXBB PP.. 6.5 8.4 4.2 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) 12-Jan-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000