SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 14 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 15.4 12.2 7.1 SSSMMM MBFFF%%%.. . 9.9 7.8 4.2 00 01 17.2 14.2 8.0 ASSXXM MMBBFFF%%% .... 10.9 9.2 4.7 01 02 16.8 15.4 8.5 ASSSXX MMMBBF%%%% ..... 11.2 10.1 5.0 02 03 16.1 16.0 8.8 SSSXX MMMBBB%%%% ..... 10.7 10.5 5.2 03 04 15.9 16.2 8.9 SSSXX MMMBBP%%%% .... 10.5 10.7 5.2 04 05 15.5 16.0 8.8 SSSXX MMBBBP%%%. .... 10.5 10.6 5.2 05 06 15.8 15.4 8.6 ASSSXX MMMBB%%%%% ..... 10.4 10.3 5.0 06 07 16.0 14.3 8.0 ASSXXM MMMBF%%%%% ..... 10.4 9.5 4.7 07 08 15.5 12.5 7.2 SSSXMM MMFFF%%%%. ..... 10.2 8.3 4.2 08 09 14.1 8.9 5.4 SSMMMMM MFFF%%%%.. ... 9.5 6.0 3.1 09 10 10.7 2.1 0.0 XMMMMMMMMF %%%%.... 7.6 1.4 0.0 10 11 8.6 2.1 0.0 XMMMMMMF%% %..... 6.0 1.4 0.0 11 12 7.2 2.1 0.0 XMMMMMF%%. ... 5.1 1.4 0.0 12 13 6.8 2.1 0.0 XMMMMM%%%. .. 4.8 1.4 0.0 13 14 6.6 2.1 0.0 XMMMMM%%%. .. 4.8 1.4 0.0 14 15 6.3 2.1 0.0 XMMMMF%%.. . 4.8 1.4 0.0 15 16 6.5 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 6.1 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 5.0 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 12.2 8.2 5.1 SSMMMFF FF%%... 7.6 4.2 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) 14-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000