SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 12 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 12-16 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 16.4 13.9 8.0 ASSXMM MMBFFF%%%. .. 10.1 9.0 4.7 00 01 17.5 15.6 8.8 SSSXX MMBBBFF%%% .... 10.5 10.2 5.2 01 02 17.5 16.6 9.3 ASSSX MMBBBBF%%% %... 10.5 11.0 5.5 02 03 17.5 17.2 9.6 ASSSX XMBBBBB%%% .... 10.6 11.4 5.6 03 04 17.4 17.4 9.7 ASSSX XMMBBBB%%% .... 10.7 11.6 5.7 04 05 17.1 17.3 9.6 ASSSX XMMBBBB%%% ... 10.7 11.5 5.6 05 06 16.0 16.7 9.4 SSSSX XMBBBP%%%. ... 10.1 11.1 5.4 06 07 15.3 15.7 8.9 SSSXX MMBBB%%%%. .. 9.7 10.5 5.2 07 08 15.2 14.1 8.1 ASSSXM MMBBF%%%.. .. 9.6 9.5 4.7 08 09 14.8 11.4 6.8 ASSXMMM MFFF%%%%.. .. 9.4 7.6 4.0 09 10 12.7 2.2 0.0 XMMMMMMMMM MF%%%%%... .. 8.5 1.5 1.2 10 11 10.0 2.2 0.0 XMMMMMMMM% %%%%...... 6.9 1.5 0.0 11 12 8.8 2.2 0.0 XMMMMMMM%% %%%..... 6.2 1.5 0.0 12 13 8.2 2.2 0.0 XMMMMMMF%% %%..... 5.8 1.5 0.0 13 14 8.0 2.2 0.0 XMMMMMM%%% %.... 5.7 1.5 0.0 14 15 8.2 2.2 0.0 XMMMMMMF%% %.... 5.5 1.5 0.0 15 16 7.9 2.2 0.0 XMMMMMM%%% .... 5.4 1.5 0.0 16 17 7.4 2.2 0.0 XMMMMMF%%% ... 5.3 1.5 0.0 17 18 6.7 2.2 0.0 XMMMMM%%%. .. 5.0 1.5 0.0 18 19 6.1 2.2 0.0 XMMMMM%%.. . 4.5 1.5 0.0 19 20 5.6 2.2 0.0 XMMMM%%%.. 4.1 1.5 0.0 20 21 5.5 2.2 0.0 XMMMM%%... 4.1 1.5 0.0 21 22 7.8 2.2 0.0 XMMMMMF%%% .. 5.4 1.5 0.0 22 23 13.4 11.0 6.6 ASSMMMM BFF%%%.. 8.3 7.0 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) 12-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000