SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 10 October, 2026 T-index: 60 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-17 1E 2 1 5 10 15 20 25 30 35 40 2F 29-36 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.4 14.5 8.3 ASSSXM MBBBF%%%.. . 9.3 9.5 4.9 00 01 15.8 16.0 9.0 SSSXX MBBBBP%%%. . 9.3 10.6 5.3 01 02 16.0 17.0 9.5 ASSSX XBBBBPP%%. .. 9.7 11.2 5.5 02 03 16.6 17.5 9.7 ASSSX XMBBBBP%%. .. 10.0 11.6 5.7 03 04 17.1 17.7 9.8 ASSSX XMBBBBB%%% ... 10.3 11.8 5.7 04 05 17.1 17.6 9.7 ASSSX XMBBBBB%%% ... 10.5 11.7 5.7 05 06 16.0 17.0 9.5 ASSSX XMBBBPP%%. .. 10.0 11.4 5.5 06 07 15.3 16.1 9.1 SSSSX MBBBBP%%.. .. 9.5 10.8 5.3 07 08 14.8 14.7 8.4 ASSSXM MBBB%%%%.. . 9.2 9.8 4.9 08 09 15.0 12.4 7.3 SSSXMM MBFF%%%%.. . 9.2 8.2 4.3 09 10 12.9 7.7 4.9 SMMMMMM MF%%%%%... .. 8.6 4.2 3.1 10 11 10.7 2.2 0.0 XMMMMMMMMM %%%%%%.... .. 7.4 1.5 0.0 11 12 9.5 2.2 0.0 XMMMMMMMM% %%%%..... 6.8 1.5 0.0 12 13 8.9 2.2 0.0 XMMMMMMM%% %%%..... 6.2 1.5 0.0 13 14 8.8 2.2 0.0 XMMMMMMM%% %%..... 6.0 1.5 0.0 14 15 9.1 2.2 0.0 XMMMMMMFF% %%.... 6.0 1.5 0.0 15 16 8.7 2.2 0.0 XMMMMMMF%% %.... 5.7 1.5 0.0 16 17 8.3 2.2 0.0 XMMMMMMF%% %.... 5.6 1.5 0.0 17 18 7.2 2.2 0.0 XMMMMMF%%. ... 5.3 1.5 0.0 18 19 6.4 2.2 0.0 XMMMMM%%%. .. 4.7 1.5 0.0 19 20 6.0 2.2 0.0 XMMMMM%%.. . 4.6 1.5 0.0 20 21 6.6 2.2 0.0 XMMMMM%%%. .. 4.9 1.5 0.0 21 22 10.1 6.6 4.3 ASMMMMFF %%%... 6.5 3.6 2.8 22 23 14.0 12.1 7.2 SSSMMM BBF%%%... 8.5 7.9 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) 10-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000