SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 18 November, 2025 T-index: 110 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 14.3 15.9 9.4 ASSXX MBBBP%%... 8.8 10.5 5.5 00 01 14.5 17.3 10.0 ASSSX XBBBPPP... 9.1 11.5 5.8 01 02 15.2 18.2 10.5 SSSX XXBBBPPE.. . 9.6 12.1 6.1 02 03 15.9 18.8 10.7 SSSX XXBBBPPP.. .. 10.0 12.5 6.2 03 04 16.6 18.9 10.8 SSSS XXBBBBPP%. ... 10.3 12.6 6.3 04 05 17.0 18.8 10.8 SSSS XXMBBBPP%% ... 10.5 12.6 6.2 05 06 16.6 18.3 10.5 SSSS XXMBBBPP%% .... 10.3 12.3 6.1 06 07 15.7 17.4 10.1 ASSSX XMBBBPP%%. .... 9.9 11.7 5.9 07 08 14.8 16.1 9.4 ASSSX MMBBPP%%.. .. 9.6 10.7 5.5 08 09 15.0 14.1 8.5 ASSSXM MMBB%%%%.. ... 9.6 9.2 5.0 09 10 14.6 10.7 6.7 SSMMMM MMFF%%%%.. .. 9.6 6.5 4.1 10 11 13.7 2.5 0.0 XMMMMMMMMM MFF%%%%... .. 9.5 1.7 0.0 11 12 12.6 2.5 0.0 XMMMMMMMMM MF%%%%.... 8.8 1.7 0.0 12 13 11.8 2.5 0.0 XMMMMMMMMM F%%%%... 8.2 1.7 0.0 13 14 11.6 2.5 0.0 XMMMMMMMMF F%%%.... 7.9 1.7 0.0 14 15 11.8 2.5 0.0 XMMMMMMMMF F%%%.... 7.8 1.7 0.0 15 16 12.3 2.5 0.0 XMMMMMMMMF FF%%%.... 7.8 1.7 0.0 16 17 11.1 2.5 0.0 XMMMMMMMMF F%%%... 7.3 1.7 0.0 17 18 9.7 2.5 0.0 XMMMMMMMF% %%.... 6.7 1.7 0.0 18 19 8.8 2.5 0.0 XMMMMMMF%% %%... 6.2 1.7 0.0 19 20 8.7 2.5 0.0 XMMMMMMF%% %.... 6.0 1.7 0.0 20 21 8.8 2.5 0.0 XMMMMMMM%% %.... 6.3 1.7 0.0 21 22 11.8 10.2 6.4 ASSMMMB F%%%%... 7.5 6.7 3.8 22 23 13.9 13.8 8.3 ASSSXM BBB%%%.... 8.3 9.1 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) 18-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000