SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 7 December, 2025 T-index: 120 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 13-22 1E 2 1 5 10 15 20 25 30 35 40 2F 29-43 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.0 16.2 9.6 ASSXX BBBPPP.... 8.7 10.7 5.6 00 01 14.8 17.5 10.2 ASSSX XBBBPPP... . 9.2 11.7 6.0 01 02 15.4 18.4 10.7 SSSX XXBBBPPP.. . 9.7 12.3 6.2 02 03 16.0 19.0 10.9 SSSX XXBBBPPPE. . 9.9 12.6 6.4 03 04 16.5 19.1 11.0 SSSS XXBBBBPPP. .. 10.2 12.8 6.4 04 05 17.0 19.0 11.0 SSSS XXBBBBPPP. ... 10.4 12.7 6.4 05 06 16.3 18.5 10.7 SSSS XXBBBBPP%. ... 10.2 12.4 6.2 06 07 15.8 17.6 10.3 ASSSX XMBBBPP%%. ... 9.9 11.8 6.0 07 08 15.2 16.3 9.7 ASSSX MMBBBP%%.. .. 9.7 10.9 5.7 08 09 14.9 14.4 8.7 SSSXM MMBB%%%%.. .. 9.6 9.5 5.2 09 10 14.3 11.3 7.1 SSSMMM MFFF%%%%.. . 9.6 7.0 4.3 10 11 13.5 2.6 0.0 MMMMMMMMMM MFF%%%%... . 9.5 0.0 1.7 11 12 12.8 2.6 0.0 XMMMMMMMMM MF%%%%.... 9.1 1.7 0.0 12 13 12.7 2.6 0.0 XMMMMMMMMM FF%%%%... 8.7 1.7 0.0 13 14 12.7 2.6 0.0 XMMMMMMMMM FF%%%%... 8.3 1.7 0.0 14 15 13.0 2.6 0.0 XMMMMMMMMM FF%%%%.... 8.3 1.7 0.0 15 16 13.0 2.6 0.0 XMMMMMMMMM FF%%%%.... 8.2 1.7 0.0 16 17 12.0 2.6 0.0 XMMMMMMMMF F%%%.... 7.6 1.7 0.0 17 18 10.5 2.6 0.0 XMMMMMMMFF %%%.... 7.1 1.7 0.0 18 19 9.9 2.6 0.0 XMMMMMMMF% %%%... 6.5 1.7 0.0 19 20 9.2 2.6 0.0 XMMMMMMMF% %%... 6.2 1.7 0.0 20 21 9.1 2.6 0.0 XMMMMMMMF% %%... 6.3 1.7 0.0 21 22 11.8 10.8 6.9 ASSXMMB F%%%.... 7.4 7.2 4.0 22 23 13.7 14.2 8.6 ASSSXM BBBP%%... 8.4 9.4 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) 7-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000