SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 8 July, 2026 T-index: 48 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 28-32 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.3 11.8 6.8 SSXMMM BFFF%%.... 9.2 7.4 4.2 00 01 15.7 13.9 7.8 ASSXMM MBBFF%%%.. .. 10.1 9.0 4.7 01 02 15.2 15.1 8.4 ASSSXM MMBBB%%%.. .. 10.2 9.9 5.0 02 03 14.6 15.8 8.7 SSSXX MMBBP%%%.. ... 9.9 10.4 5.1 03 04 14.0 16.0 8.8 SSSXX MBBPPP%%.. .. 9.5 10.6 5.2 04 05 13.9 15.8 8.7 SSSXX MBBPP%%... . 9.3 10.5 5.1 05 06 13.6 15.2 8.4 ASSSXX MBBPP%%... . 9.2 10.1 4.9 06 07 13.6 14.0 7.9 ASSXXM MBBP%%%... .. 9.0 9.3 4.6 07 08 13.4 12.1 7.0 SSXMMM MBF%%%%... .. 8.9 8.0 4.1 08 09 12.6 7.9 4.9 ASXMMMMM FF%%%%.... 8.6 5.2 2.9 09 10 9.7 2.1 0.0 XMMMMMMMF% %%..... 7.0 1.4 0.0 10 11 7.5 2.1 0.0 XMMMMMF%%. .... 5.4 1.4 0.0 11 12 6.6 2.1 0.0 XMMMMM%%.. .. 4.8 1.4 0.0 12 13 6.3 2.1 0.0 XMMMMF%%.. . 4.6 1.4 0.0 13 14 6.1 2.1 0.0 XMMMMF%%.. . 4.5 1.4 0.0 14 15 5.9 2.1 0.0 XMMMM%%%.. . 4.5 1.4 0.0 15 16 6.0 2.1 0.0 XMMMM%%%.. . 4.5 1.4 0.0 16 17 5.9 2.1 0.0 XMMMM%%%.. . 4.4 1.4 0.0 17 18 5.5 2.1 0.0 XMMMM%%%.. . 4.1 1.4 0.0 18 19 5.2 2.1 0.0 XMMMM%%... . 3.8 1.4 0.0 19 20 4.8 2.1 0.0 XMMM%%%... 3.4 1.4 0.0 20 21 4.7 2.1 0.0 XMMM%%%... 3.4 1.4 0.0 21 22 5.7 2.1 0.0 XMMMM%%... 4.3 1.4 0.0 22 23 10.5 7.0 4.4 SMMMFFF %%.. 6.6 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) 8-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000