SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 6 May, 2026 T-index: 75 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 17.5 12.9 7.6 ASSXMM MMMFFFF%%% .... 11.1 8.3 4.5 00 01 19.6 14.9 8.5 SSSXM MMMMFFFFF% %%%.... 12.2 9.7 5.1 01 02 19.9 16.1 9.1 SSSSX MMMMMBFFF% %%%..... 12.7 10.6 5.4 02 03 19.8 16.7 9.4 ASSSX MMMMMBFFF% %%%..... 12.7 11.0 5.5 03 04 19.6 17.0 9.5 ASSSX XMMMBBBFF% %%%..... 12.5 11.2 5.6 04 05 19.2 16.8 9.4 ASSSX XMMMBBFFF% %%%.... 12.2 11.1 5.5 05 06 18.9 16.2 9.1 SSSSX MMMMBBFF%% %%...... 12.2 10.7 5.3 06 07 19.0 15.1 8.6 ASSSXM MMMMBFFF%% %%%...... 12.2 10.0 5.0 07 08 18.5 13.2 7.7 ASSXMM MMMMFFFF%% %%...... 12.1 8.8 4.5 08 09 17.4 9.7 5.9 SSXMMMM MMMFFFF%%% %..... 11.4 6.5 3.4 09 10 13.7 2.3 0.0 XMMMMMMMMM MFF%%%%... ... 9.2 1.5 0.0 10 11 10.6 2.3 0.0 XMMMMMMMMF %%%%...... . 7.2 1.5 0.0 11 12 9.0 2.3 0.0 XMMMMMMM%% %%..... 6.2 1.5 0.0 12 13 8.0 2.3 0.0 XMMMMMM%%% %..... 5.6 1.5 0.0 13 14 7.6 2.3 0.0 XMMMMMM%%% .... 5.4 1.5 0.0 14 15 7.2 2.3 0.0 XMMMMMF%%% ... 5.3 1.5 0.0 15 16 7.2 2.3 0.0 XMMMMMF%%% ... 5.2 1.5 0.0 16 17 6.9 2.3 0.0 XMMMMM%%%. ... 5.1 1.5 0.0 17 18 6.8 2.3 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 18 19 6.5 2.3 0.0 XMMMMM%%%. ... 4.5 1.5 0.0 19 20 6.1 2.3 0.0 XMMMMF%%.. .. 4.2 1.5 0.0 20 21 5.6 2.3 0.0 XMMMM%%%.. . 4.1 1.5 0.0 21 22 6.9 2.3 0.0 XMMMMM%%%. . 4.9 1.5 0.0 22 23 13.9 9.1 5.6 ASMMMMM FFF%%%... 8.4 5.0 3.6 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-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000