SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 9 September, 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 12-16 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 15.9 13.7 7.9 ASSXMM MBBFF%%%%. .. 9.9 8.9 4.7 00 01 17.0 15.4 8.7 SSSXX MMBBBF%%%% ... 10.4 10.1 5.1 01 02 17.1 16.5 9.2 SSSSX MMBBBBF%%% ... 10.3 10.9 5.4 02 03 16.9 17.1 9.5 ASSSX XMBBBBP%%% ... 10.3 11.3 5.6 03 04 16.8 17.3 9.6 ASSSX XMBBBBP%%% ... 10.5 11.5 5.6 04 05 16.5 17.1 9.5 ASSSX XMBBBBP%%. ... 10.4 11.4 5.5 05 06 15.5 16.6 9.2 SSSSX MMBBBP%%%. .. 10.0 11.0 5.4 06 07 15.0 15.6 8.8 SSSXX MMBBP%%%.. .. 9.6 10.4 5.1 07 08 14.7 13.9 8.0 ASSXXM MBBF%%%%.. .. 9.5 9.4 4.6 08 09 14.4 11.2 6.7 ASSXMMM MFFF%%%%.. . 9.3 7.4 3.9 09 10 12.4 2.2 0.0 XMMMMMMMMM FF%%%%.... . 8.3 1.5 0.0 10 11 9.7 2.2 0.0 XMMMMMMMM% %%%%..... 6.8 1.5 0.0 11 12 8.6 2.2 0.0 XMMMMMMM%% %%..... 6.1 1.5 0.0 12 13 7.9 2.2 0.0 XMMMMMM%%% %..... 5.7 1.5 0.0 13 14 7.8 2.2 0.0 XMMMMMM%%% ..... 5.5 1.5 0.0 14 15 8.0 2.2 0.0 XMMMMMF%%% .... 5.4 1.5 0.0 15 16 7.7 2.2 0.0 XMMMMMF%%% .... 5.3 1.5 0.0 16 17 7.3 2.2 0.0 XMMMMMF%%. ... 5.2 1.5 0.0 17 18 6.5 2.2 0.0 XMMMMM%%%. .. 4.9 1.5 0.0 18 19 6.0 2.2 0.0 XMMMMM%%.. . 4.4 1.5 0.0 19 20 5.5 2.2 0.0 XMMMM%%... 4.0 1.5 0.0 20 21 5.3 2.2 0.0 XMMMM%%... 4.0 1.5 0.0 21 22 7.4 2.2 0.0 XMMMMMF%%. .. 5.3 1.5 0.0 22 23 13.0 10.8 6.5 ASSMMMB FF%%%... 8.2 6.8 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) 9-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000