SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 18 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 12-18 1E 2 1 5 10 15 20 25 30 35 40 2F 29-37 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.8 14.6 8.4 ASSSXM BBBB%%%%.. 8.9 9.6 4.9 00 01 15.1 16.1 9.1 SSSXX MBBBBP%%.. . 9.0 10.6 5.3 01 02 15.6 17.0 9.5 ASSSX XBBBBPP%.. . 9.4 11.3 5.5 02 03 16.4 17.6 9.8 ASSSX XMBBBBP%%. .. 9.8 11.7 5.7 03 04 17.0 17.8 9.9 ASSSX XMBBBBP%%% ... 10.1 11.8 5.7 04 05 17.1 17.6 9.8 ASSSX XMBBBBB%%% ... 10.3 11.8 5.7 05 06 16.0 17.1 9.5 ASSSX XMBBBPP%%. ... 10.0 11.4 5.5 06 07 15.2 16.2 9.1 SSSSX MBBBBP%%.. .. 9.4 10.9 5.3 07 08 14.6 14.8 8.5 ASSSXM MBBB%%%%.. . 9.2 9.9 4.9 08 09 14.9 12.7 7.4 SSSXMM MBFF%%%%.. .. 9.2 8.3 4.4 09 10 13.0 8.4 5.3 SSMMMMM MF%%%%%... .. 8.7 4.9 3.3 10 11 11.0 2.2 0.0 XMMMMMMMMM %%%%%%.... .. 7.6 1.5 0.0 11 12 9.7 2.2 0.0 XMMMMMMMM% %%%%...... 6.9 1.5 0.0 12 13 9.1 2.2 0.0 XMMMMMMMF% %%%..... 6.3 1.5 0.0 13 14 9.1 2.2 0.0 XMMMMMMMF% %%..... 6.1 1.5 0.0 14 15 9.3 2.2 0.0 XMMMMMMFF% %%.... 6.1 1.5 0.0 15 16 9.0 2.2 0.0 XMMMMMMF%% %%.... 5.9 1.5 0.0 16 17 8.5 2.2 0.0 XMMMMMMF%% %.... 5.7 1.5 0.0 17 18 7.3 2.2 0.0 XMMMMMF%%% ... 5.4 1.5 0.0 18 19 6.5 2.2 0.0 XMMMMM%%%. .. 4.8 1.5 0.0 19 20 6.1 2.2 0.0 XMMMMM%%.. . 4.8 1.5 0.0 20 21 6.8 2.2 0.0 XMMMMM%%%. ... 5.1 1.5 0.0 21 22 10.4 7.6 4.8 ASMMMMFF %%%.... 6.8 4.6 3.0 22 23 13.9 12.4 7.3 SSSXMM BBF%%%... 8.4 8.1 4.3 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-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000