SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 18 May, 2026 T-index: 45 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 15.3 12.1 7.0 SSXMMM MBFFF%%... . 9.9 7.7 4.2 00 01 17.1 14.1 7.9 ASSXXM MMBBFFF%%% ... 10.9 9.2 4.7 01 02 16.6 15.3 8.5 ASSSXM MMMBBF%%%% .... 11.1 10.0 5.0 02 03 15.7 15.9 8.8 SSSXX MMMBB%%%%% ..... 10.4 10.5 5.2 03 04 15.5 16.2 8.9 SSSXX MMBBBP%%%% .... 10.3 10.7 5.2 04 05 15.1 16.0 8.8 SSSXX MMBBBP%%%. .... 10.2 10.6 5.2 05 06 15.3 15.4 8.5 ASSSXX MMBBB%%%%. .... 10.2 10.2 5.0 06 07 15.8 14.3 8.0 ASSXXM MMMBF%%%%% ..... 10.3 9.5 4.7 07 08 15.3 12.4 7.1 SSSXMM MMFFF%%%%. ..... 10.0 8.3 4.2 08 09 13.8 8.7 5.3 SSMMMMM MFF%%%%... .. 9.3 5.8 3.1 09 10 10.5 2.1 0.0 XMMMMMMMMF %%%..... 7.5 1.4 0.0 10 11 8.6 2.1 0.0 XMMMMMMF%% %.... 5.8 1.4 0.0 11 12 7.1 2.1 0.0 XMMMMMF%%. ... 5.0 1.4 0.0 12 13 6.8 2.1 0.0 XMMMMM%%.. .. 4.7 1.4 0.0 13 14 6.7 2.1 0.0 XMMMMM%%.. .. 4.7 1.4 0.0 14 15 6.2 2.1 0.0 XMMMMF%%.. . 4.7 1.4 0.0 15 16 6.4 2.1 0.0 XMMMMM%%.. .. 4.7 1.4 0.0 16 17 6.3 2.1 0.0 XMMMMM%%.. . 4.6 1.4 0.0 17 18 6.0 2.1 0.0 XMMMMM%%.. .. 4.4 1.4 0.0 18 19 5.7 2.1 0.0 XMMMM%%%.. .. 4.1 1.4 0.0 19 20 5.5 2.1 0.0 XMMMM%%%.. .. 3.8 1.4 0.0 20 21 5.1 2.1 0.0 XMMMM%%... . 3.7 1.4 0.0 21 22 6.1 2.1 0.0 XMMMMF%%.. 4.5 1.4 0.0 22 23 12.0 8.0 4.9 SMMMMFF F%%%... 7.6 3.8 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) 18-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000