SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 10 September, 2026 T-index: 55 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 15.6 13.7 7.8 ASSXMM MBBFF%%%.. . 9.7 8.9 4.6 00 01 16.7 15.3 8.6 SSSXX MMBBBF%%%% ... 10.2 10.1 5.1 01 02 16.8 16.4 9.1 SSSSX MMBBBB%%%% ... 10.1 10.8 5.4 02 03 16.6 17.0 9.4 ASSSX XMBBBBP%%. ... 10.0 11.2 5.5 03 04 16.5 17.2 9.5 ASSSX XMBBBBP%%. ... 10.1 11.4 5.6 04 05 16.2 17.0 9.4 ASSSX XMBBBBP%%. .. 10.1 11.3 5.5 05 06 15.2 16.5 9.2 SSSSX MMBBBP%%.. .. 9.7 11.0 5.3 06 07 14.7 15.5 8.7 SSSXX MBBBP%%%.. .. 9.4 10.3 5.1 07 08 14.5 13.9 7.9 ASSXXM MBBF%%%%.. . 9.3 9.3 4.6 08 09 14.1 11.2 6.6 ASSXMMM MFFF%%%... . 9.1 7.4 3.9 09 10 11.9 2.2 0.0 XMMMMMMMMM F%%%%%.... . 8.1 1.4 0.0 10 11 9.3 2.2 0.0 XMMMMMMMM% %%%...... 6.6 1.4 0.0 11 12 8.3 2.2 0.0 XMMMMMMM%% %%..... 6.0 1.4 0.0 12 13 7.7 2.2 0.0 XMMMMMM%%% %..... 5.6 1.4 0.0 13 14 7.6 2.2 0.0 XMMMMMM%%% .... 5.4 1.4 0.0 14 15 7.8 2.2 0.0 XMMMMMF%%% .... 5.3 1.4 0.0 15 16 7.6 2.2 0.0 XMMMMMF%%% .... 5.2 1.4 0.0 16 17 7.2 2.2 0.0 XMMMMMF%%. ... 5.1 1.4 0.0 17 18 6.4 2.2 0.0 XMMMMM%%%. .. 4.8 1.4 0.0 18 19 5.9 2.2 0.0 XMMMM%%%.. . 4.3 1.4 0.0 19 20 5.4 2.2 0.0 XMMMM%%... 3.9 1.4 0.0 20 21 5.3 2.2 0.0 XMMMM%%... 4.0 1.4 0.0 21 22 7.4 2.2 0.0 XMMMMMF%%. .. 5.2 1.4 0.0 22 23 12.7 10.8 6.4 ASSMMMB FF%%%.. 8.1 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) 10-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000