SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 9 July, 2026 T-index: 60 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 14.9 12.0 7.0 SSXMMM MBFF%%%... . 9.4 7.5 4.3 00 01 16.5 14.1 8.0 ASSXXM MMBBFF%%%. ... 10.5 9.1 4.8 01 02 16.2 15.3 8.6 SSSXM MMBBBF%%%. ... 10.7 10.0 5.1 02 03 15.8 16.0 8.9 SSSXX MMBBBP%%%. .... 10.6 10.5 5.3 03 04 15.0 16.3 9.0 SSSXX MMBBPP%%.. ... 10.1 10.7 5.3 04 05 14.9 16.1 8.9 SSSXX MMBBPP%%.. .. 9.9 10.6 5.2 05 06 14.6 15.4 8.6 SSSXX MMBBP%%%.. .. 9.7 10.2 5.1 06 07 14.6 14.3 8.1 ASSSXM MBBB%%%%.. ... 9.6 9.5 4.7 07 08 14.4 12.3 7.1 SSSXMM MBFF%%%%.. .. 9.5 8.2 4.2 08 09 13.7 8.1 5.0 ASXMMMMM MFF%%%%... . 9.2 5.3 3.0 09 10 10.6 2.2 0.0 XMMMMMMMMF %%%..... 7.4 1.5 0.0 10 11 8.0 2.2 0.0 XMMMMMM%%% ..... 5.7 1.5 0.0 11 12 6.9 2.2 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 12 13 6.5 2.2 0.0 XMMMMM%%.. .. 4.7 1.5 0.0 13 14 6.1 2.2 0.0 XMMMMF%%.. . 4.5 1.5 0.0 14 15 5.9 2.2 0.0 XMMMM%%%.. . 4.5 1.5 0.0 15 16 6.0 2.2 0.0 XMMMM%%%.. . 4.6 1.5 0.0 16 17 5.8 2.2 0.0 XMMMM%%%.. . 4.4 1.5 0.0 17 18 5.5 2.2 0.0 XMMMM%%%.. . 4.1 1.5 0.0 18 19 5.3 2.2 0.0 XMMMM%%%.. . 3.9 1.5 0.0 19 20 4.9 2.2 0.0 XMMM%%%... 3.5 1.5 0.0 20 21 4.8 2.2 0.0 XMMM%%%... 3.5 1.5 0.0 21 22 5.9 2.2 0.0 XMMMM%%... 4.4 1.5 0.0 22 23 10.8 7.2 4.5 SMMMFFF %%... 6.6 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) 9-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000