SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 30 September, 2026 T-index: 65 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 16.0 14.4 8.3 ASSSXM MBBBF%%%%. .. 9.7 9.4 4.9 00 01 16.7 15.9 9.0 SSSXX MMBBBF%%%% ... 9.9 10.5 5.3 01 02 17.0 16.9 9.5 ASSSX XMBBBB%%%% ... 10.1 11.2 5.5 02 03 17.3 17.5 9.8 ASSSX XMBBBBB%%% ... 10.3 11.6 5.7 03 04 17.6 17.7 9.8 ASSSX XMBBBBB%%% ... 10.6 11.8 5.7 04 05 17.4 17.5 9.8 ASSSX XMMBBBB%%% ... 10.7 11.7 5.7 05 06 16.1 17.0 9.5 ASSSX XMBBBBP%%. ... 10.1 11.4 5.5 06 07 15.3 16.1 9.1 SSSSX MMBBBP%%%. .. 9.6 10.8 5.3 07 08 15.0 14.6 8.4 ASSSXM MMBB%%%%.. .. 9.5 9.8 4.9 08 09 15.0 12.2 7.2 SSSMMM MBFF%%%%.. .. 9.3 8.0 4.2 09 10 13.0 6.5 4.3 ASMMMMMM MF%%%%%... .. 8.6 0.0 2.9 10 11 10.6 2.2 0.0 XMMMMMMMMM %%%%%..... .. 7.3 1.5 0.0 11 12 9.3 2.2 0.0 XMMMMMMMM% %%%...... 6.6 1.5 0.0 12 13 8.8 2.2 0.0 XMMMMMMM%% %%%..... 6.1 1.5 0.0 13 14 8.7 2.2 0.0 XMMMMMMM%% %%..... 5.9 1.5 0.0 14 15 8.9 2.2 0.0 XMMMMMMF%% %%.... 5.9 1.5 0.0 15 16 8.5 2.2 0.0 XMMMMMMF%% %.... 5.7 1.5 0.0 16 17 8.0 2.2 0.0 XMMMMMM%%% %.... 5.5 1.5 0.0 17 18 7.1 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 5.9 2.2 0.0 XMMMMM%%.. . 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 4.4 3.1 SMMMMFF% %%... 6.2 0.0 2.4 22 23 14.0 11.8 7.0 SSXMMM BFF%%%... 8.6 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) 30-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000