SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 1 July, 2025 T-index: 85 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 16.5 12.3 7.3 SSSMMM MBFFFF%%%. .. 10.3 7.7 4.4 00 01 18.5 14.5 8.3 ASSSXM MMMBFFFF%% %.... 11.7 9.3 5.0 01 02 18.9 15.7 8.9 SSSXX MMMMBFFF%% %%.... 12.2 10.3 5.3 02 03 18.4 16.4 9.3 ASSSX MMMMBBFF%% %%.... 12.1 10.8 5.5 03 04 17.4 16.7 9.4 ASSSX MMMBBBF%%% ..... 11.6 11.0 5.5 04 05 17.1 16.5 9.3 ASSSX MMMBBBF%%% ..... 11.2 10.9 5.5 05 06 16.7 15.8 9.0 SSSXX MMMBBF%%%% ..... 11.0 10.5 5.3 06 07 16.9 14.6 8.4 ASSSXM MMMBFF%%%% ..... 10.9 9.7 4.9 07 08 16.5 12.6 7.4 SSSXMM MMFFFF%%%% ..... 10.8 8.3 4.3 08 09 15.6 8.1 5.1 ASSMMMMM MMFFF%%%.. ... 10.3 5.3 3.0 09 10 12.4 2.4 0.0 XMMMMMMMMM FF%%%..... 8.5 1.6 0.0 10 11 9.1 2.4 0.0 XMMMMMMMF% %%..... 6.5 1.6 0.0 11 12 7.7 2.4 0.0 XMMMMMF%%% .... 5.5 1.6 0.0 12 13 7.1 2.4 0.0 XMMMMMF%%. ... 5.1 1.6 0.0 13 14 6.6 2.4 0.0 XMMMMM%%.. .. 4.8 1.6 0.0 14 15 6.2 2.4 0.0 XMMMMF%%.. . 4.6 1.6 0.0 15 16 6.1 2.4 0.0 XMMMMF%%.. . 4.7 1.6 0.0 16 17 6.1 2.4 0.0 XMMMMF%%.. . 4.6 1.6 0.0 17 18 5.8 2.4 0.0 XMMMM%%%.. . 4.4 1.6 0.0 18 19 5.6 2.4 0.0 XMMMM%%%.. . 4.1 1.6 0.0 19 20 5.3 2.4 0.0 XMMMM%%... . 3.7 1.6 0.0 20 21 5.2 2.4 0.0 XMMMM%%... . 3.7 1.6 0.0 21 22 6.3 2.4 0.0 XMMMMF%%.. 4.5 1.6 0.0 22 23 11.8 7.1 4.6 SMMMMFF F%%... 7.1 0.0 3.3 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) 1-Jul-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000