SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 6 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 28-35 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.9 14.2 8.1 ASSSXM MBBB%%%... 9.0 9.3 4.8 00 01 15.4 15.7 8.8 SSSXX MBBBB%%%.. . 9.1 10.4 5.2 01 02 15.7 16.7 9.3 SSSSX XBBBBP%%.. . 9.3 11.1 5.4 02 03 16.0 17.3 9.5 ASSSX XBBBBPP%%. .. 9.6 11.4 5.6 03 04 16.4 17.4 9.6 ASSSX XMBBBBP%%. .. 9.9 11.6 5.6 04 05 16.4 17.3 9.5 ASSSX XMBBBBP%%. .. 10.1 11.5 5.5 05 06 15.5 16.8 9.3 SSSSX XMBBBP%%.. .. 9.7 11.2 5.4 06 07 14.8 15.9 8.9 SSSXX MBBBP%%%.. . 9.3 10.6 5.1 07 08 14.4 14.4 8.2 ASSSXM MBBB%%%... . 9.1 9.7 4.8 08 09 14.5 12.2 7.1 SSSMMM MBFF%%%... . 9.0 8.0 4.2 09 10 12.4 7.2 4.6 ASMMMMMM FF%%%%.... . 8.3 3.7 3.0 10 11 10.2 2.1 0.0 XMMMMMMMMF %%%%%..... . 7.1 1.4 0.0 11 12 8.9 2.1 0.0 XMMMMMMM%% %%%..... 6.4 1.4 0.0 12 13 8.3 2.1 0.0 XMMMMMMM%% %%..... 5.9 1.4 0.0 13 14 8.2 2.1 0.0 XMMMMMMF%% %..... 5.7 1.4 0.0 14 15 8.4 2.1 0.0 XMMMMMMF%% %.... 5.7 1.4 0.0 15 16 8.1 2.1 0.0 XMMMMMMF%% .... 5.5 1.4 0.0 16 17 7.7 2.1 0.0 XMMMMMF%%% .... 5.4 1.4 0.0 17 18 6.8 2.1 0.0 XMMMMM%%%. .. 5.1 1.4 0.0 18 19 6.1 2.1 0.0 XMMMMM%%.. . 4.5 1.4 0.0 19 20 5.7 2.1 0.0 XMMMM%%%.. 4.3 1.4 0.0 20 21 6.1 2.1 0.0 XMMMMM%%.. . 4.7 1.4 0.0 21 22 9.3 5.9 3.9 AMMMMFF% %%... 6.2 0.0 2.6 22 23 13.4 11.8 7.0 SSXMMM BFF%%%.. 8.2 7.7 4.1 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) 6-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000