SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 6 June, 2026 T-index: 80 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-14 1E 2 1 5 10 15 20 25 30 35 40 2F 28-31 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 16.9 12.3 7.3 SSSMMM MMFFFF%%%% ... 10.5 7.7 4.4 00 01 18.8 14.4 8.3 ASSSXM MMMMFFFF%% %%.... 12.0 9.3 5.0 01 02 19.2 15.7 8.9 SSSXX MMMMBFFFF% %%%.... 12.5 10.3 5.3 02 03 18.9 16.4 9.2 SSSSX MMMMBBFF%% %%..... 12.3 10.8 5.4 03 04 18.3 16.6 9.3 ASSSX MMMMBBFF%% %%.... 12.1 11.0 5.5 04 05 17.8 16.4 9.2 SSSSX MMMBBBF%%% %..... 11.7 10.9 5.4 05 06 17.8 15.8 8.9 SSSXX MMMMBFF%%% %..... 11.7 10.5 5.2 06 07 18.2 14.6 8.4 ASSSXM MMMMFFFF%% %%...... 11.6 9.7 4.9 07 08 17.7 12.6 7.4 SSSXMM MMMFFFF%%% %...... 11.5 8.3 4.3 08 09 16.0 8.2 5.2 SSMMMMM MMFFF%%%%. .... 10.5 5.4 3.1 09 10 12.8 2.3 0.0 XMMMMMMMMM FF%%%%.... . 8.7 1.5 0.0 10 11 9.5 2.3 0.0 XMMMMMMMF% %%...... 6.6 1.5 0.0 11 12 7.9 2.3 0.0 XMMMMMM%%% ..... 5.6 1.5 0.0 12 13 7.3 2.3 0.0 XMMMMMF%%. .... 5.2 1.5 0.0 13 14 6.9 2.3 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 14 15 6.3 2.3 0.0 XMMMMM%%.. .. 4.8 1.5 0.0 15 16 6.3 2.3 0.0 XMMMMM%%.. .. 4.8 1.5 0.0 16 17 6.3 2.3 0.0 XMMMMM%%.. .. 4.7 1.5 0.0 17 18 6.1 2.3 0.0 XMMMMM%%.. .. 4.6 1.5 0.0 18 19 6.0 2.3 0.0 XMMMMM%%.. .. 4.4 1.5 0.0 19 20 5.8 2.3 0.0 XMMMM%%%.. .. 4.0 1.5 0.0 20 21 5.4 2.3 0.0 XMMMM%%%.. . 4.0 1.5 0.0 21 22 6.5 2.3 0.0 XMMMMF%%.. . 4.6 1.5 0.0 22 23 12.5 7.3 4.7 SMMMMFF FF%%... 7.5 0.0 3.3 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) 6-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000