SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 1 June, 2026 T-index: 90 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 28-32 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.9 12.5 7.4 ASSMMM MMFFFFF%%% .... 11.1 7.9 4.5 00 01 20.1 14.7 8.5 SSSXM MMMMFFFFFF %%%.... 12.6 9.5 5.1 01 02 20.5 15.9 9.1 SSSSX MMMMMFFFFF %%%%.... 13.2 10.4 5.4 02 03 20.0 16.6 9.4 ASSSX MMMMMBFFF% %%%..... 13.0 10.9 5.6 03 04 19.4 16.9 9.5 ASSSX XMMMBBFFF% %%%.... 12.7 11.1 5.6 04 05 18.9 16.7 9.4 ASSSX MMMMBBFF%% %%.... 12.4 11.0 5.5 05 06 18.8 16.0 9.1 SSSSX MMMMBBFF%% %%..... 12.3 10.6 5.4 06 07 19.3 14.8 8.6 ASSSXM MMMMFFFFF% %%%..... 12.3 9.8 5.0 07 08 18.8 12.8 7.6 SSSXMM MMMMFFFF%% %%..... 12.1 8.5 4.4 08 09 17.3 8.5 5.4 SSMMMMM MMMFFFF%%% ..... 11.3 5.6 3.2 09 10 13.8 2.4 0.0 XMMMMMMMMM MFF%%%%... .. 9.4 1.6 0.0 10 11 10.6 2.4 0.0 XMMMMMMMFF %%%...... 7.2 1.6 0.0 11 12 8.7 2.4 0.0 XMMMMMMF%% %.... 6.0 1.6 0.0 12 13 7.9 2.4 0.0 XMMMMMF%%% .... 5.5 1.6 0.0 13 14 7.3 2.4 0.0 XMMMMMF%%. ... 5.2 1.6 0.0 14 15 6.7 2.4 0.0 XMMMMM%%%. .. 5.0 1.6 0.0 15 16 6.6 2.4 0.0 XMMMMM%%%. .. 5.0 1.6 0.0 16 17 6.5 2.4 0.0 XMMMMM%%%. .. 4.9 1.6 0.0 17 18 6.3 2.4 0.0 XMMMMM%%%. .. 4.7 1.6 0.0 18 19 6.1 2.4 0.0 XMMMMM%%.. .. 4.4 1.6 0.0 19 20 5.8 2.4 0.0 XMMMM%%%.. .. 4.1 1.6 0.0 20 21 5.5 2.4 0.0 XMMMM%%%.. . 4.1 1.6 0.0 21 22 6.7 2.4 0.0 XMMMMF%%.. . 4.7 1.6 0.0 22 23 13.3 7.6 4.9 SMMMMMF FFF%%... 8.0 0.0 3.4 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-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000