SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 30 August, 2026 T-index: 95 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 18.1 14.0 8.2 ASSSMM MMMBFFFF%% %... 11.2 9.0 4.9 00 01 19.7 15.8 9.1 SSSSX MMMMBFFFF% %%%... 12.0 10.3 5.4 01 02 19.7 16.9 9.7 ASSSX XMMMBBFFF% %%%... 12.1 11.2 5.7 02 03 19.8 17.6 10.0 ASSSX XMMMBBBFF% %%.... 12.3 11.6 5.9 03 04 19.2 17.8 10.1 ASSSS XMMMBBBFF% %%.... 12.2 11.8 5.9 04 05 18.9 17.6 10.0 ASSSX XMMMBBBF%% %.... 12.1 11.7 5.8 05 06 18.0 17.0 9.7 ASSSX XMMBBBB%%% %... 11.7 11.3 5.7 06 07 17.5 15.9 9.2 SSSSX MMMBBFF%%% .... 11.3 10.7 5.4 07 08 17.4 14.2 8.4 ASSSXM MMMBFFF%%% .... 11.2 9.5 4.8 08 09 17.4 11.2 6.8 ASSXMMM MMMFFFF%%% .... 11.0 7.4 4.0 09 10 15.1 2.4 0.0 XMMMMMMMMM MMFFF%%%.. ... 9.8 1.6 0.0 10 11 11.9 2.4 0.0 XMMMMMMMMM F%%%%..... . 8.1 1.6 0.0 11 12 10.4 2.4 0.0 XMMMMMMMMF %%%..... 7.2 1.6 0.0 12 13 9.6 2.4 0.0 XMMMMMMMF% %%..... 6.6 1.6 0.0 13 14 9.0 2.4 0.0 XMMMMMMF%% %%.... 6.2 1.6 0.0 14 15 8.7 2.4 0.0 XMMMMMMF%% %.... 5.9 1.6 0.0 15 16 8.3 2.4 0.0 XMMMMMMF%% %.... 5.7 1.6 0.0 16 17 7.8 2.4 0.0 XMMMMMM%%% .... 5.5 1.6 0.0 17 18 7.2 2.4 0.0 XMMMMMF%%% ... 5.3 1.6 0.0 18 19 6.7 2.4 0.0 XMMMMM%%%. ... 4.9 1.6 0.0 19 20 6.0 2.4 0.0 XMMMMM%%.. .. 4.4 1.6 0.0 20 21 5.7 2.4 0.0 XMMMMM%%.. . 4.4 1.6 0.0 21 22 7.7 2.4 0.0 XMMMMMF%%. .. 5.4 1.6 0.0 22 23 14.6 10.7 6.6 ASSMMMM FFFF%%%.. 9.0 6.6 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) 30-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000