SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 5 July, 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 15.7 12.2 7.2 SSSMMM MBFFF%%%.. .. 9.9 7.6 4.4 00 01 17.5 14.3 8.2 ASSSXM MMMBFFF%%% .... 11.1 9.3 4.9 01 02 17.7 15.6 8.8 SSSXX MMMBBFF%%% %.... 11.5 10.2 5.2 02 03 17.4 16.3 9.1 SSSSX MMMBBBF%%% %..... 11.5 10.7 5.4 03 04 16.4 16.5 9.2 SSSSX MMMBBB%%%% .... 11.0 10.9 5.4 04 05 16.3 16.3 9.2 SSSSX MMBBBB%%%. .... 10.7 10.8 5.4 05 06 15.7 15.7 8.9 SSSXX MMBBB%%%%. .... 10.4 10.4 5.2 06 07 15.9 14.5 8.3 ASSSXM MMBBF%%%%. ..... 10.3 9.6 4.9 07 08 15.6 12.5 7.3 SSSXMM MMFFF%%%%. .... 10.2 8.3 4.3 08 09 14.8 8.1 5.1 ASSMMMMM MMFF%%%%.. ... 9.8 5.3 3.0 09 10 11.5 2.3 0.0 XMMMMMMMMF F%%%...... 7.9 1.5 0.0 10 11 8.6 2.3 0.0 XMMMMMMF%% %..... 6.1 1.5 0.0 11 12 7.3 2.3 0.0 XMMMMMF%%. .... 5.2 1.5 0.0 12 13 6.7 2.3 0.0 XMMMMM%%%. ... 4.9 1.5 0.0 13 14 6.3 2.3 0.0 XMMMMF%%.. .. 4.7 1.5 0.0 14 15 6.0 2.3 0.0 XMMMM%%%.. . 4.5 1.5 0.0 15 16 6.0 2.3 0.0 XMMMM%%%.. . 4.6 1.5 0.0 16 17 5.9 2.3 0.0 XMMMM%%%.. . 4.5 1.5 0.0 17 18 5.6 2.3 0.0 XMMMM%%%.. . 4.2 1.5 0.0 18 19 5.5 2.3 0.0 XMMMM%%%.. . 4.1 1.5 0.0 19 20 5.2 2.3 0.0 XMMMM%%... . 3.6 1.5 0.0 20 21 5.1 2.3 0.0 XMMMM%%... 3.6 1.5 0.0 21 22 6.1 2.3 0.0 XMMMMF%%.. 4.4 1.5 0.0 22 23 11.2 7.1 4.6 SMMMMFF F%%... 6.9 0.0 3.2 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) 5-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000