SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 29 June, 2026 T-index: 80 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 16.1 12.2 7.2 SSSMMM MBFFFF%%%. .. 10.1 7.6 4.4 00 01 17.9 14.4 8.3 ASSSXM MMMBFFF%%% %.... 11.4 9.3 4.9 01 02 18.3 15.6 8.9 SSSXX MMMBBFFF%% %%.... 11.9 10.2 5.3 02 03 18.1 16.3 9.2 SSSSX MMMBBBFF%% %..... 11.9 10.7 5.4 03 04 17.2 16.6 9.3 ASSSX MMMBBBF%%% ..... 11.4 10.9 5.5 04 05 16.9 16.4 9.2 SSSSX MMMBBB%%%% .... 11.1 10.8 5.4 05 06 16.6 15.7 8.9 SSSXX MMMBBF%%%% ..... 10.9 10.4 5.2 06 07 16.7 14.5 8.3 ASSSXM MMMBFF%%%% ..... 10.8 9.6 4.9 07 08 16.4 12.5 7.3 SSSXMM MMFFFF%%%. ..... 10.7 8.3 4.3 08 09 15.3 8.0 5.1 ASSMMMMM MMFFF%%%.. ... 10.1 5.2 3.0 09 10 12.1 2.3 0.0 XMMMMMMMMM FF%%%..... 8.3 1.5 0.0 10 11 8.9 2.3 0.0 XMMMMMMF%% %...... 6.3 1.5 0.0 11 12 7.5 2.3 0.0 XMMMMMF%%% .... 5.4 1.5 0.0 12 13 7.0 2.3 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 13 14 6.4 2.3 0.0 XMMMMM%%.. .. 4.8 1.5 0.0 14 15 6.0 2.3 0.0 XMMMM%%%.. . 4.6 1.5 0.0 15 16 6.0 2.3 0.0 XMMMM%%%.. . 4.6 1.5 0.0 16 17 6.0 2.3 0.0 XMMMM%%%.. . 4.6 1.5 0.0 17 18 5.8 2.3 0.0 XMMMM%%%.. . 4.3 1.5 0.0 18 19 5.6 2.3 0.0 XMMMM%%%.. .. 4.2 1.5 0.0 19 20 5.3 2.3 0.0 XMMMM%%... . 3.8 1.5 0.0 20 21 5.1 2.3 0.0 XMMMM%%... . 3.7 1.5 0.0 21 22 6.2 2.3 0.0 XMMMMF%%.. 4.5 1.5 0.0 22 23 11.6 7.0 4.5 SMMMMFF F%%... 7.0 0.0 3.2 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) 29-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000