SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 3 December, 2025 T-index: 115 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 13-22 1E 2 1 5 10 15 20 25 30 35 40 2F 29-42 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.1 16.1 9.5 ASSXX BBBBPP.... 8.7 10.7 5.5 00 01 14.6 17.4 10.2 ASSSX XBBBPPP... 9.1 11.6 5.9 01 02 15.3 18.3 10.6 SSSX XXBBBPPE.. . 9.6 12.2 6.2 02 03 15.8 18.9 10.8 SSSX XXBBBPPP.. .. 9.9 12.6 6.3 03 04 16.3 19.1 10.9 SSSS XXBBBBPPP. .. 10.2 12.7 6.3 04 05 16.9 18.9 10.9 SSSS XXBBBBPP%. ... 10.4 12.6 6.3 05 06 16.2 18.4 10.6 SSSS XXBBBBPP%. ... 10.2 12.3 6.2 06 07 15.6 17.6 10.2 ASSSX XMBBBPP%%. ... 9.9 11.8 6.0 07 08 14.9 16.2 9.6 ASSSX MMBBPP%%.. .. 9.7 10.8 5.6 08 09 14.8 14.3 8.6 SSSXM MMBB%%%%.. .. 9.6 9.4 5.1 09 10 14.1 11.2 7.0 SSMMMM MFFF%%%%.. . 9.6 6.9 4.3 10 11 13.6 2.5 0.0 XMMMMMMMMM MFF%%%%... . 9.4 1.7 1.1 11 12 12.8 2.5 0.0 XMMMMMMMMM MF%%%%.... 8.9 1.7 0.0 12 13 12.4 2.5 0.0 XMMMMMMMMM FF%%%.... 8.5 1.7 0.0 13 14 12.3 2.5 0.0 XMMMMMMMMM FF%%%.... 8.1 1.7 0.0 14 15 12.5 2.5 0.0 XMMMMMMMMM FF%%%.... 8.0 1.7 0.0 15 16 12.6 2.5 0.0 XMMMMMMMMF FF%%%.... 8.0 1.7 0.0 16 17 11.6 2.5 0.0 XMMMMMMMMF F%%%.... 7.4 1.7 0.0 17 18 10.1 2.5 0.0 XMMMMMMMFF %%%... 6.8 1.7 0.0 18 19 9.5 2.5 0.0 XMMMMMMMF% %%.... 6.4 1.7 0.0 19 20 8.9 2.5 0.0 XMMMMMMF%% %%... 6.1 1.7 0.0 20 21 8.8 2.5 0.0 XMMMMMMM%% %%... 6.2 1.7 0.0 21 22 11.5 10.7 6.8 ASSXMMB F%%%.... 7.4 7.1 3.9 22 23 13.7 14.1 8.5 ASSSXM BBBP%%... 8.3 9.3 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) 3-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000