SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 8 June, 2026 T-index: 85 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 17.3 12.3 7.3 SSSMMM MMFFFFF%%% ... 10.7 7.7 4.4 00 01 19.3 14.5 8.4 ASSSXM MMMMFFFFF% %%.... 12.2 9.4 5.0 01 02 19.8 15.8 9.0 SSSXX MMMMBFFFF% %%%..... 12.8 10.3 5.3 02 03 19.1 16.5 9.3 ASSSX MMMMBBFFF% %%..... 12.5 10.8 5.5 03 04 18.5 16.7 9.4 ASSSX MMMMBBFF%% %%..... 12.2 11.0 5.5 04 05 18.0 16.5 9.3 ASSSX MMMMBBF%%% %..... 11.8 10.9 5.5 05 06 18.0 15.9 9.0 SSSXX MMMMBFF%%% %...... 11.8 10.5 5.3 06 07 18.4 14.7 8.4 ASSSXM MMMMFFFF%% %%...... 11.8 9.7 4.9 07 08 17.9 12.6 7.4 SSSXMM MMMFFFF%%% %...... 11.5 8.4 4.4 08 09 16.2 8.2 5.2 SSMMMMM MMFFFF%%%. .... 10.6 5.4 3.1 09 10 13.0 2.4 0.0 XMMMMMMMMM FF%%%%.... .. 8.9 1.6 0.0 10 11 9.6 2.4 0.0 XMMMMMMMF% %%...... 6.7 1.6 0.0 11 12 7.9 2.4 0.0 XMMMMMM%%% .... 5.7 1.6 0.0 12 13 7.4 2.4 0.0 XMMMMMF%%. ... 5.3 1.6 0.0 13 14 7.0 2.4 0.0 XMMMMM%%%. ... 5.0 1.6 0.0 14 15 6.4 2.4 0.0 XMMMMM%%.. .. 4.8 1.6 0.0 15 16 6.4 2.4 0.0 XMMMMM%%.. .. 4.8 1.6 0.0 16 17 6.4 2.4 0.0 XMMMMM%%.. .. 4.8 1.6 0.0 17 18 6.2 2.4 0.0 XMMMMM%%.. .. 4.7 1.6 0.0 18 19 6.0 2.4 0.0 XMMMMM%%.. .. 4.4 1.6 0.0 19 20 5.8 2.4 0.0 XMMMM%%%.. .. 4.0 1.6 0.0 20 21 5.4 2.4 0.0 XMMMM%%%.. . 4.0 1.6 0.0 21 22 6.5 2.4 0.0 XMMMMF%%.. . 4.7 1.6 0.0 22 23 12.7 7.3 4.7 SMMMMFF FF%%... 7.6 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) 8-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000