SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 1 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 28-35 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.7 14.3 8.2 ASSSXM MBBBF%%%.. . 9.5 9.4 4.8 00 01 16.3 15.9 8.9 SSSXX MBBBBF%%%. .. 9.6 10.5 5.2 01 02 16.5 16.9 9.4 ASSSX XMBBBB%%%. .. 9.9 11.1 5.5 02 03 16.8 17.4 9.7 ASSSX XMBBBBP%%. ... 10.2 11.6 5.6 03 04 17.2 17.6 9.8 ASSSX XMBBBBB%%% ... 10.4 11.7 5.7 04 05 17.0 17.5 9.7 ASSSX XMBBBBP%%% ... 10.5 11.6 5.6 05 06 15.9 16.9 9.4 ASSSX XMBBBP%%%. .. 10.0 11.3 5.5 06 07 15.3 16.0 9.0 SSSXX MMBBBP%%.. .. 9.5 10.7 5.2 07 08 14.9 14.5 8.3 ASSSXM MBBB%%%%.. . 9.3 9.7 4.8 08 09 14.9 12.1 7.2 SSSMMM MBFF%%%%.. . 9.2 8.0 4.2 09 10 12.8 6.6 4.3 ASMMMMMM MF%%%%%... .. 8.5 0.0 2.9 10 11 10.4 2.2 0.0 XMMMMMMMMM %%%%%..... . 7.2 1.5 0.0 11 12 9.2 2.2 0.0 XMMMMMMMM% %%%...... 6.6 1.5 0.0 12 13 8.6 2.2 0.0 XMMMMMMM%% %%...... 6.1 1.5 0.0 13 14 8.5 2.2 0.0 XMMMMMMF%% %%.... 5.9 1.5 0.0 14 15 8.8 2.2 0.0 XMMMMMMF%% %..... 5.8 1.5 0.0 15 16 8.4 2.2 0.0 XMMMMMMF%% %.... 5.6 1.5 0.0 16 17 8.0 2.2 0.0 XMMMMMM%%% .... 5.4 1.5 0.0 17 18 7.1 2.2 0.0 XMMMMMF%%. ... 5.2 1.5 0.0 18 19 6.4 2.2 0.0 XMMMMM%%.. .. 4.6 1.5 0.0 19 20 5.9 2.2 0.0 XMMMM%%%.. . 4.4 1.5 0.0 20 21 6.2 2.2 0.0 XMMMMM%%.. . 4.7 1.5 0.0 21 22 9.3 4.7 3.3 SMMMMFF% %%... 6.1 0.0 2.4 22 23 13.8 11.8 7.0 SSXMMM BFF%%%... 8.4 7.6 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) 1-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000