SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 1 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 12-15 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 16.1 13.6 7.8 ASSXMM MBBFFF%%%. .. 9.9 8.8 4.7 00 01 17.4 15.3 8.7 SSSXM MMBBBFF%%% .... 10.5 10.0 5.1 01 02 17.4 16.4 9.2 SSSSX MMBBBBF%%% .... 10.6 10.8 5.4 02 03 17.3 17.0 9.5 ASSSX XMBBBBB%%% .... 10.7 11.3 5.6 03 04 16.9 17.2 9.6 ASSSX XMBBBBP%%% .... 10.7 11.4 5.6 04 05 16.6 17.1 9.5 ASSSX XMBBBBP%%. ... 10.6 11.3 5.6 05 06 15.7 16.5 9.2 SSSSX MMBBBP%%%. ... 10.3 11.0 5.4 06 07 15.2 15.5 8.8 SSSXX MMBBB%%%.. ... 10.0 10.3 5.1 07 08 14.9 13.8 8.0 ASSXXM MMBF%%%%.. .. 9.8 9.3 4.6 08 09 14.7 10.9 6.5 ASSXMMM MFFF%%%%.. .. 9.7 7.2 3.8 09 10 12.4 2.2 0.0 XMMMMMMMMM FF%%%%.... .. 8.4 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%%% %..... 5.6 1.5 0.0 13 14 7.7 2.2 0.0 XMMMMMM%%% ..... 5.5 1.5 0.0 14 15 7.7 2.2 0.0 XMMMMMF%%% .... 5.3 1.5 0.0 15 16 7.4 2.2 0.0 XMMMMMF%%% ... 5.2 1.5 0.0 16 17 7.1 2.2 0.0 XMMMMMF%%. ... 5.1 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 5.4 2.2 0.0 XMMMM%%... . 4.0 1.5 0.0 20 21 5.2 2.2 0.0 XMMMM%%... 3.9 1.5 0.0 21 22 7.0 2.2 0.0 XMMMMM%%%. . 5.0 1.5 0.0 22 23 13.1 10.5 6.3 ASSMMMB FFF%%... 8.1 6.5 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) 1-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000