SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 7 September, 2026 T-index: 70 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-16 1E 2 1 5 10 15 20 25 30 35 40 2F 28-34 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 16.5 13.8 8.0 ASSXMM MMBFFF%%%. .. 10.3 9.0 4.8 00 01 17.7 15.6 8.8 SSSXX MMBBBFF%%% %... 10.8 10.2 5.2 01 02 17.8 16.6 9.4 ASSSX MMMBBBF%%% %... 10.8 11.0 5.5 02 03 17.8 17.3 9.6 ASSSX XMMBBBB%%% %... 10.9 11.4 5.6 03 04 17.6 17.5 9.7 ASSSX XMMBBBB%%% .... 11.0 11.6 5.7 04 05 17.3 17.3 9.7 ASSSX XMMBBBB%%% .... 10.9 11.5 5.6 05 06 16.3 16.7 9.4 ASSSX XMBBBB%%%. ... 10.3 11.1 5.5 06 07 15.5 15.7 8.9 SSSXX MMBBB%%%%. ... 10.0 10.5 5.2 07 08 15.3 14.1 8.1 ASSSXM MMBBF%%%%. ... 9.9 9.4 4.7 08 09 15.1 11.3 6.8 ASSXMMM MMFFF%%%.. .. 9.6 7.5 4.0 09 10 13.0 2.3 0.0 XMMMMMMMMM MF%%%%%... .. 8.7 1.5 0.0 10 11 10.1 2.3 0.0 XMMMMMMMMF %%%%...... 7.1 1.5 0.0 11 12 8.9 2.3 0.0 XMMMMMMM%% %%%..... 6.3 1.5 0.0 12 13 8.2 2.3 0.0 XMMMMMMF%% %..... 5.9 1.5 0.0 13 14 8.1 2.3 0.0 XMMMMMMF%% %.... 5.7 1.5 0.0 14 15 8.2 2.3 0.0 XMMMMMMF%% %.... 5.5 1.5 0.0 15 16 7.8 2.3 0.0 XMMMMMF%%% .... 5.4 1.5 0.0 16 17 7.4 2.3 0.0 XMMMMMF%%% ... 5.2 1.5 0.0 17 18 6.7 2.3 0.0 XMMMMM%%%. .. 5.0 1.5 0.0 18 19 6.1 2.3 0.0 XMMMMM%%.. .. 4.5 1.5 0.0 19 20 5.6 2.3 0.0 XMMMM%%%.. . 4.1 1.5 0.0 20 21 5.4 2.3 0.0 XMMMM%%... 4.1 1.5 0.0 21 22 7.6 2.3 0.0 XMMMMMF%%% .. 5.3 1.5 0.0 22 23 13.5 10.9 6.5 ASSMMMM FFF%%%.. 8.4 6.8 4.0 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) 7-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000