SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 15 October, 2026 T-index: 50 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 28-36 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.6 14.4 8.2 ASSSXM BBBB%%%... 8.8 9.5 4.8 00 01 15.0 15.9 8.9 SSSXX BBBBP%%... 8.8 10.5 5.2 01 02 15.3 16.8 9.3 SSSSX XBBBBP%%.. . 9.1 11.1 5.4 02 03 15.9 17.3 9.6 ASSSX XBBBBPP%%. .. 9.5 11.5 5.6 03 04 16.5 17.5 9.7 ASSSX XMBBBBP%%. .. 9.9 11.7 5.6 04 05 16.5 17.4 9.6 ASSSX XMBBBBP%%. ... 10.1 11.6 5.6 05 06 15.6 16.9 9.4 SSSSX XMBBBP%%.. .. 9.7 11.3 5.4 06 07 14.9 16.0 8.9 SSSXX MBBBPP%%.. .. 9.3 10.7 5.2 07 08 14.4 14.6 8.3 ASSSXM MBBB%%%... . 9.0 9.8 4.8 08 09 14.7 12.4 7.3 SSSXMM MBFF%%%%.. . 9.0 8.2 4.3 09 10 12.7 8.1 5.1 SSMMMMM MF%%%%%... .. 8.4 4.6 3.2 10 11 10.7 2.1 0.0 XMMMMMMMMM %%%%%..... .. 7.4 1.4 0.0 11 12 9.3 2.1 0.0 XMMMMMMMM% %%%...... 6.7 1.4 0.0 12 13 8.6 2.1 0.0 XMMMMMMM%% %%...... 6.0 1.4 0.0 13 14 8.5 2.1 0.0 XMMMMMMF%% %%.... 5.8 1.4 0.0 14 15 8.7 2.1 0.0 XMMMMMMF%% %.... 5.9 1.4 0.0 15 16 8.4 2.1 0.0 XMMMMMMF%% %.... 5.7 1.4 0.0 16 17 8.0 2.1 0.0 XMMMMMM%%% .... 5.5 1.4 0.0 17 18 7.0 2.1 0.0 XMMMMM%%%. ... 5.2 1.4 0.0 18 19 6.2 2.1 0.0 XMMMMM%%.. . 4.6 1.4 0.0 19 20 5.9 2.1 0.0 XMMMM%%%.. . 4.5 1.4 0.0 20 21 6.5 2.1 0.0 XMMMMM%%%. .. 4.8 1.4 0.0 21 22 10.2 7.2 4.6 ASMMMMFF %%%... 6.7 4.3 2.9 22 23 13.7 12.1 7.1 SSSMMM BBF%%%... 8.3 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) 15-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000