SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 16 September, 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 12-16 1E 2 1 5 10 15 20 25 30 35 40 2F 28-33 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.5 13.7 7.9 ASSXMM MBBFF%%%.. . 9.5 8.9 4.6 00 01 16.5 15.4 8.6 SSSXX MMBBBF%%%. ... 9.9 10.1 5.1 01 02 16.5 16.4 9.1 SSSSX MMBBBB%%%. ... 9.8 10.8 5.3 02 03 16.3 17.0 9.4 ASSSX XMBBBBP%%. .. 9.8 11.2 5.5 03 04 16.3 17.2 9.5 ASSSX XMBBBBP%%. .. 10.0 11.4 5.5 04 05 16.1 17.0 9.4 ASSSX XMBBBBP%%. .. 10.0 11.3 5.5 05 06 15.3 16.5 9.1 SSSSX MBBBBP%%.. . 9.5 11.0 5.3 06 07 14.7 15.5 8.7 ASSSXX MBBBP%%%.. . 9.3 10.4 5.0 07 08 14.4 13.9 7.9 ASSXXM MBBF%%%... . 9.2 9.4 4.6 08 09 14.0 11.4 6.7 ASSXMMM MFF%%%%... 8.9 7.5 3.9 09 10 11.8 2.1 0.0 MMMMMMMMMM F%%%%%.... 8.0 0.0 1.8 10 11 9.2 2.1 0.0 XMMMMMMMM% %%%...... 6.5 1.4 0.0 11 12 8.2 2.1 0.0 XMMMMMMM%% %%..... 5.9 1.4 0.0 12 13 7.6 2.1 0.0 XMMMMMM%%% %.... 5.5 1.4 0.0 13 14 7.5 2.1 0.0 XMMMMMM%%% .... 5.4 1.4 0.0 14 15 7.8 2.1 0.0 XMMMMMF%%% .... 5.3 1.4 0.0 15 16 7.6 2.1 0.0 XMMMMMF%%% ... 5.2 1.4 0.0 16 17 7.2 2.1 0.0 XMMMMMF%%. ... 5.1 1.4 0.0 17 18 6.5 2.1 0.0 XMMMMM%%.. .. 4.8 1.4 0.0 18 19 5.9 2.1 0.0 XMMMM%%%.. . 4.3 1.4 0.0 19 20 5.4 2.1 0.0 XMMMM%%... 3.9 1.4 0.0 20 21 5.3 2.1 0.0 XMMMM%%... 4.0 1.4 0.0 21 22 7.7 2.1 0.0 XMMMMMF%%% .. 5.3 1.4 0.0 22 23 12.7 11.0 6.5 ASSMMMB BF%%%.. 8.0 7.0 3.9 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) 16-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000