SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 8 August, 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 28-33 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.0 12.7 7.4 SSSXMM MBFF%%%... . 9.5 8.1 4.4 00 01 16.6 14.7 8.3 ASSSXM MMBBFF%%%. ... 10.4 9.5 4.9 01 02 16.4 15.8 8.9 SSSXX MMBBBF%%%% .... 10.5 10.4 5.2 02 03 16.1 16.5 9.2 SSSSX MMBBBB%%%% .... 10.6 10.9 5.4 03 04 15.3 16.7 9.3 SSSSX MMBBBP%%%. ... 10.1 11.0 5.4 04 05 15.1 16.5 9.2 SSSSX MMBBBP%%.. ... 10.0 11.0 5.4 05 06 14.7 15.9 8.9 SSSXX MBBBP%%%.. ... 9.7 10.6 5.2 06 07 14.5 14.8 8.4 ASSSXM MBBB%%%%.. ... 9.5 9.9 4.9 07 08 14.2 13.0 7.5 SSSXMM MBBF%%%... .. 9.5 8.7 4.4 08 09 14.0 9.6 5.8 SSXMMMM MFF%%%%... .. 9.4 6.4 3.4 09 10 11.6 2.2 0.0 XMMMMMMMMF F%%%...... 8.0 1.5 0.0 10 11 9.0 2.2 0.0 XMMMMMMM%% %%..... 6.3 1.5 0.0 11 12 7.9 2.2 0.0 XMMMMMM%%% ..... 5.5 1.5 0.0 12 13 7.2 2.2 0.0 XMMMMMF%%. ... 5.1 1.5 0.0 13 14 6.9 2.2 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 14 15 6.6 2.2 0.0 XMMMMM%%%. .. 4.8 1.5 0.0 15 16 6.4 2.2 0.0 XMMMMM%%.. .. 4.8 1.5 0.0 16 17 6.3 2.2 0.0 XMMMMF%%.. .. 4.7 1.5 0.0 17 18 5.9 2.2 0.0 XMMMM%%%.. .. 4.5 1.5 0.0 18 19 5.6 2.2 0.0 XMMMM%%%.. .. 4.1 1.5 0.0 19 20 5.0 2.2 0.0 XMMMM%%... . 3.6 1.5 0.0 20 21 4.7 2.2 0.0 XMMMM%%... 3.5 1.5 0.0 21 22 5.7 2.2 0.0 XMMMM%%... 4.3 1.5 0.0 22 23 11.8 9.0 5.5 ASMMMBF F%%... 7.3 5.0 3.5 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-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000