SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 26 May, 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 28-32 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.2 12.5 7.4 ASSMMM MMFFFFF%%% .... 10.8 7.9 4.5 00 01 19.4 14.6 8.4 ASSSXM MMMMFFFFF% %%%.... 12.2 9.5 5.0 01 02 19.6 15.8 9.0 SSSXX MMMMBFFFF% %%%..... 12.7 10.4 5.3 02 03 19.3 16.5 9.3 ASSSX MMMMBBFFF% %%%..... 12.6 10.9 5.5 03 04 18.8 16.8 9.4 ASSSX XMMMBBFF%% %%..... 12.2 11.1 5.5 04 05 18.3 16.6 9.3 ASSSX MMMMBBFF%% %..... 12.1 11.0 5.5 05 06 18.2 15.9 9.0 SSSXX MMMMBFFF%% %%..... 11.9 10.6 5.3 06 07 18.6 14.8 8.5 ASSSXM MMMMFFFF%% %%...... 11.9 9.8 4.9 07 08 18.3 12.8 7.5 SSSXMM MMMMFFFF%% %%...... 11.8 8.5 4.4 08 09 16.8 8.7 5.4 SSMMMMM MMMFFF%%%% ..... 11.0 5.8 3.2 09 10 13.2 2.3 0.0 XMMMMMMMMM MFF%%%.... .. 9.0 1.5 0.0 10 11 10.3 2.3 0.0 XMMMMMMMFF %%%...... 7.0 1.5 0.0 11 12 8.5 2.3 0.0 XMMMMMMF%% %..... 5.9 1.5 0.0 12 13 7.7 2.3 0.0 XMMMMMF%%% .... 5.4 1.5 0.0 13 14 7.1 2.3 0.0 XMMMMMF%%. ... 5.2 1.5 0.0 14 15 6.6 2.3 0.0 XMMMMM%%%. .. 5.0 1.5 0.0 15 16 6.6 2.3 0.0 XMMMMM%%%. .. 5.0 1.5 0.0 16 17 6.4 2.3 0.0 XMMMMM%%.. .. 4.8 1.5 0.0 17 18 6.2 2.3 0.0 XMMMMM%%%. .. 4.6 1.5 0.0 18 19 6.1 2.3 0.0 XMMMMM%%.. .. 4.4 1.5 0.0 19 20 5.8 2.3 0.0 XMMMM%%%.. .. 4.1 1.5 0.0 20 21 5.5 2.3 0.0 XMMMM%%%.. . 4.1 1.5 0.0 21 22 6.6 2.3 0.0 XMMMMF%%.. . 4.7 1.5 0.0 22 23 13.1 7.9 5.0 SMMMMMF FFF%%... 7.9 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) 26-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000