SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 29 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 13.5 16.1 9.5 ASSXX BBBPPE... 8.3 10.7 5.5 00 01 14.6 17.5 10.2 ASSXX XBBBPPE... 8.8 11.6 5.9 01 02 15.4 18.4 10.6 SSSX XXBBBPPE.. 9.4 12.2 6.2 02 03 15.8 18.9 10.9 SSSX XXBBBPPP.. . 9.7 12.6 6.3 03 04 16.0 19.1 10.9 SSSX XXBBBPPPE. .. 10.0 12.7 6.3 04 05 16.6 18.9 10.9 SSSS XXBBBBPP%. ... 10.2 12.7 6.3 05 06 16.0 18.4 10.6 SSSX XXBBBPPP%. ... 10.0 12.4 6.2 06 07 15.3 17.6 10.2 ASSSX XMBBBPP%%. ... 9.6 11.8 6.0 07 08 14.8 16.3 9.6 ASSSX MBBBPP%%.. .. 9.4 10.8 5.6 08 09 14.3 14.4 8.7 SSSXM MBBB%%%%.. . 9.3 9.4 5.1 09 10 13.6 11.3 7.1 SSSMMM MFF%%%%... . 9.1 7.0 4.3 10 11 13.2 2.5 0.0 MMMMMMMMMM MFF%%%.... 9.0 0.0 2.1 11 12 12.7 2.5 0.0 XMMMMMMMMM FF%%%%... 8.8 1.7 0.0 12 13 12.6 2.5 0.0 XMMMMMMMMM FF%%%%... 8.5 1.7 0.0 13 14 12.4 2.5 0.0 XMMMMMMMMM FF%%%.... 8.1 1.7 0.0 14 15 12.6 2.5 0.0 XMMMMMMMMM FF%%%.... 8.1 1.7 0.0 15 16 12.5 2.5 0.0 XMMMMMMMMF FF%%%.... 7.9 1.7 0.0 16 17 11.8 2.5 0.0 XMMMMMMMMF F%%%.... 7.5 1.7 0.0 17 18 10.3 2.5 0.0 XMMMMMMMFF %%%.... 6.8 1.7 0.0 18 19 9.6 2.5 0.0 XMMMMMMMF% %%%... 6.4 1.7 0.0 19 20 8.4 2.5 0.0 XMMMMMMF%% %... 5.9 1.7 0.0 20 21 8.3 2.5 0.0 XMMMMMMF%% %... 5.9 1.7 0.0 21 22 10.8 10.9 6.9 ASSXMBB %%%.... 7.0 7.3 4.0 22 23 13.0 14.1 8.5 ASSXXB BBPP%... 8.0 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) 29-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000