SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 12 July, 2026 T-index: 47 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 14.1 11.9 6.9 SSXMMM BFFF%%... 9.1 7.4 4.2 00 01 15.5 13.9 7.8 ASSXMM MBBFF%%%.. . 10.0 9.0 4.7 01 02 15.0 15.1 8.4 ASSSXM MBBBP%%%.. .. 10.1 9.9 5.0 02 03 14.4 15.8 8.7 SSSXX MMBBP%%%.. .. 9.8 10.4 5.1 03 04 13.8 16.0 8.8 SSSXX MBBPPP%... . 9.3 10.6 5.2 04 05 13.7 15.8 8.7 SSSXX MBBPP%%... . 9.2 10.5 5.1 05 06 13.4 15.2 8.4 ASSSXX MBBPP%%... . 9.0 10.1 5.0 06 07 13.4 14.1 7.9 ASSXXM MBBP%%%... .. 8.9 9.3 4.6 07 08 13.2 12.1 7.0 SSXXMM MBF%%%.... . 8.8 8.1 4.1 08 09 12.5 8.1 5.0 ASXMMMMM FF%%%%.... 8.5 5.3 2.9 09 10 9.6 2.1 0.0 XMMMMMMMF% %%.... 6.9 1.4 0.0 10 11 7.5 2.1 0.0 XMMMMMF%%. .... 5.3 1.4 0.0 11 12 6.6 2.1 0.0 XMMMMM%%.. .. 4.7 1.4 0.0 12 13 6.2 2.1 0.0 XMMMMF%%.. . 4.5 1.4 0.0 13 14 6.0 2.1 0.0 XMMMM%%%.. . 4.5 1.4 0.0 14 15 5.8 2.1 0.0 XMMMM%%%.. . 4.5 1.4 0.0 15 16 6.0 2.1 0.0 XMMMM%%%.. . 4.6 1.4 0.0 16 17 5.8 2.1 0.0 XMMMM%%... . 4.4 1.4 0.0 17 18 5.4 2.1 0.0 XMMMM%%... . 4.0 1.4 0.0 18 19 5.1 2.1 0.0 XMMMM%%... . 3.8 1.4 0.0 19 20 4.7 2.1 0.0 XMMM%%%... 3.3 1.4 0.0 20 21 4.6 2.1 0.0 XMMM%%%... 3.3 1.4 0.0 21 22 5.6 2.1 0.0 XMMMM%%... 4.3 1.4 0.0 22 23 10.3 7.2 4.5 SMMMFFF %%.. 6.5 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) 12-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000