SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 7 July, 2026 T-index: 65 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 15.1 12.1 7.1 SSSMMM MBFFF%%... . 9.6 7.6 4.3 00 01 16.7 14.2 8.1 ASSSXM MMBBFF%%%. ... 10.7 9.2 4.8 01 02 16.7 15.4 8.7 SSSXX MMMBBF%%%% .... 10.9 10.1 5.1 02 03 16.2 16.1 9.0 SSSXX MMMBBB%%%% ..... 10.9 10.6 5.3 03 04 15.4 16.3 9.1 SSSSX MMBBBP%%%. ... 10.3 10.8 5.3 04 05 15.2 16.1 9.0 SSSXX MMBBBP%%%. ... 10.1 10.7 5.3 05 06 14.9 15.5 8.7 SSSXX MMBBP%%%.. ... 9.9 10.3 5.1 06 07 15.0 14.3 8.1 ASSSXM MMBB%%%%.. .... 9.8 9.5 4.8 07 08 14.7 12.3 7.2 SSSXMM MMFF%%%%.. ... 9.7 8.2 4.2 08 09 14.0 8.1 5.0 ASXMMMMM MFF%%%%... .. 9.3 5.3 3.0 09 10 10.9 2.2 0.0 XMMMMMMMMF %%%%..... 7.5 1.5 0.0 10 11 8.3 2.2 0.0 XMMMMMMF%% %.... 5.8 1.5 0.0 11 12 7.1 2.2 0.0 XMMMMMF%%. ... 5.1 1.5 0.0 12 13 6.6 2.2 0.0 XMMMMM%%.. .. 4.8 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 5.0 2.2 0.0 XMMMM%%... 3.5 1.5 0.0 20 21 4.9 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 10.9 7.1 4.5 SMMMFFF %%%.. 6.7 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) 7-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000