SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 3 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 12-14 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 15.1 11.9 7.0 SSXMMM MFFFF%%... . 9.5 7.5 4.2 00 01 16.7 14.1 8.0 ASSXXM MMBBFF%%%. ... 10.6 9.1 4.8 01 02 16.5 15.3 8.6 SSSXM MMBBBF%%%% .... 10.8 10.0 5.1 02 03 15.9 16.0 8.9 SSSXX MMBBBP%%%. .... 10.7 10.5 5.2 03 04 15.2 16.2 9.0 SSSXX MMBBBP%%%. ... 10.3 10.7 5.3 04 05 15.0 16.0 8.9 SSSXX MMBBPP%%.. ... 10.0 10.6 5.2 05 06 14.8 15.4 8.6 ASSSXX MMBBP%%%.. ... 9.9 10.2 5.0 06 07 15.0 14.2 8.1 ASSSXM MMBB%%%%.. ... 9.8 9.4 4.7 07 08 14.7 12.2 7.1 SSSXMM MBFF%%%%.. ... 9.7 8.1 4.2 08 09 13.7 7.9 4.9 ASXMMMMM MFF%%%%... . 9.2 5.2 2.9 09 10 10.7 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 6.2 2.2 0.0 XMMMMF%%.. . 4.6 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 5.9 2.2 0.0 XMMMM%%%.. . 4.5 1.5 0.0 17 18 5.6 2.2 0.0 XMMMM%%%.. . 4.2 1.5 0.0 18 19 5.4 2.2 0.0 XMMMM%%%.. . 4.0 1.5 0.0 19 20 5.1 2.2 0.0 XMMMM%%... . 3.6 1.5 0.0 20 21 4.9 2.2 0.0 XMMMM%%... 3.5 1.5 0.0 21 22 6.0 2.2 0.0 XMMMM%%... 4.4 1.5 0.0 22 23 11.0 6.9 4.4 SMMMFFF %%... 6.7 0.0 3.1 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) 3-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000