SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 2 July, 2026 T-index: 90 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 16.8 12.3 7.3 ASSMMM MMFFFF%%%. ... 10.4 7.7 4.5 00 01 18.8 14.5 8.4 ASSSXM MMMBFFFF%% %%... 11.8 9.4 5.0 01 02 19.2 15.8 9.0 SSSXX MMMMBFFFF% %%.... 12.3 10.3 5.4 02 03 19.0 16.5 9.4 ASSSX MMMMBBFF%% %%..... 12.4 10.9 5.5 03 04 17.9 16.8 9.5 ASSSX XMMBBBF%%% %.... 11.9 11.1 5.6 04 05 17.5 16.6 9.4 ASSSX MMMBBBF%%% ..... 11.5 11.0 5.5 05 06 17.1 15.9 9.1 SSSSX MMMBBFF%%% ..... 11.3 10.6 5.3 06 07 17.3 14.7 8.5 ASSSXM MMMBFFF%%% ..... 11.1 9.8 5.0 07 08 17.0 12.6 7.5 SSSXMM MMMFFF%%%% ..... 11.0 8.4 4.4 08 09 16.1 8.2 5.2 SSMMMMM MMFFFF%%%. ... 10.6 5.3 3.1 09 10 12.8 2.4 0.0 XMMMMMMMMM FF%%%%.... . 8.7 1.6 0.0 10 11 9.5 2.4 0.0 XMMMMMMMF% %%..... 6.6 1.6 0.0 11 12 8.0 2.4 0.0 XMMMMMM%%% .... 5.6 1.6 0.0 12 13 7.3 2.4 0.0 XMMMMMF%%. ... 5.2 1.6 0.0 13 14 6.6 2.4 0.0 XMMMMM%%%. .. 4.9 1.6 0.0 14 15 6.2 2.4 0.0 XMMMMF%%.. . 4.7 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%%.. . 4.7 1.6 0.0 17 18 5.9 2.4 0.0 XMMMMM%%.. . 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 11.9 7.1 4.6 SMMMMFF F%%%.. 7.2 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) 2-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000