SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 7 May, 2026 T-index: 65 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 16.8 12.8 7.4 ASSXMM MMFFFF%%%. ... 10.7 8.1 4.5 00 01 18.8 14.7 8.4 ASSSXM MMMMFFFF%% %%.... 11.8 9.6 5.0 01 02 19.1 15.9 8.9 SSSXX MMMMBFFFF% %%..... 12.2 10.4 5.3 02 03 18.9 16.5 9.2 SSSSX MMMMBBFF%% %%..... 12.3 10.9 5.4 03 04 18.6 16.8 9.3 ASSSX XMMMBBFF%% %%..... 12.0 11.1 5.5 04 05 18.3 16.6 9.2 SSSSX MMMMBBFF%% %%.... 11.8 11.0 5.4 05 06 18.0 16.0 9.0 SSSXX MMMMBBF%%% %%..... 11.7 10.6 5.2 06 07 18.0 14.9 8.4 ASSSXM MMMMFFF%%% %%...... 11.7 9.9 4.9 07 08 17.6 13.0 7.5 SSSXMM MMMMFFF%%% %...... 11.5 8.7 4.4 08 09 16.5 9.5 5.8 SSXMMMM MMMFFF%%%% ..... 10.9 6.4 3.4 09 10 12.7 2.2 0.0 XMMMMMMMMM MF%%%%.... .. 8.7 1.5 0.0 10 11 9.9 2.2 0.0 XMMMMMMMF% %%%...... 6.8 1.5 0.0 11 12 8.4 2.2 0.0 XMMMMMMF%% %..... 5.9 1.5 0.0 12 13 7.5 2.2 0.0 XMMMMMF%%% ..... 5.3 1.5 0.0 13 14 7.2 2.2 0.0 XMMMMMF%%% .... 5.2 1.5 0.0 14 15 7.0 2.2 0.0 XMMMMM%%%. ... 5.1 1.5 0.0 15 16 7.0 2.2 0.0 XMMMMM%%%. ... 5.1 1.5 0.0 16 17 6.8 2.2 0.0 XMMMMM%%%. .. 5.0 1.5 0.0 17 18 6.6 2.2 0.0 XMMMMM%%%. ... 4.8 1.5 0.0 18 19 6.2 2.2 0.0 XMMMMM%%%. ... 4.4 1.5 0.0 19 20 5.9 2.2 0.0 XMMMM%%%.. .. 4.1 1.5 0.0 20 21 5.4 2.2 0.0 XMMMM%%%.. . 4.0 1.5 0.0 21 22 6.7 2.2 0.0 XMMMMF%%.. . 4.8 1.5 0.0 22 23 13.3 8.9 5.5 ASMMMMF FFF%%... 8.1 4.8 3.5 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) 7-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000