SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 6 July, 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 12-15 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 15.9 12.3 7.2 SSSMMM MBFFF%%%.. .. 10.0 7.7 4.4 00 01 17.8 14.4 8.3 ASSSXM MMMBFFF%%% %.... 11.2 9.3 4.9 01 02 18.0 15.7 8.9 SSSXX MMMBBFF%%% %..... 11.7 10.3 5.3 02 03 18.0 16.4 9.2 SSSSX MMMBBBF%%% %..... 11.8 10.8 5.4 03 04 17.0 16.6 9.3 ASSSX MMMBBB%%%% ..... 11.3 11.0 5.5 04 05 16.7 16.4 9.2 SSSSX MMMBBB%%%% .... 11.0 10.9 5.4 05 06 16.1 15.8 8.9 SSSXX MMBBBF%%%. .... 10.7 10.5 5.2 06 07 16.3 14.6 8.4 ASSSXM MMBBFF%%%. ..... 10.6 9.7 4.9 07 08 16.0 12.5 7.4 SSSXMM MMFFF%%%%. .... 10.5 8.3 4.3 08 09 15.3 8.2 5.2 ASSMMMMM MMFFF%%%.. ... 10.1 5.3 3.0 09 10 11.9 2.3 0.0 XMMMMMMMMF F%%%%..... 8.2 1.5 0.0 10 11 8.9 2.3 0.0 XMMMMMMF%% %...... 6.3 1.5 0.0 11 12 7.6 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 6.3 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 5.9 2.3 0.0 XMMMM%%%.. . 4.5 1.5 0.0 17 18 5.7 2.3 0.0 XMMMM%%%.. . 4.2 1.5 0.0 18 19 5.5 2.3 0.0 XMMMM%%%.. . 4.0 1.5 0.0 19 20 5.1 2.3 0.0 XMMMM%%... . 3.6 1.5 0.0 20 21 5.0 2.3 0.0 XMMMM%%... 3.6 1.5 0.0 21 22 6.2 2.3 0.0 XMMMMF%%.. 4.4 1.5 0.0 22 23 11.4 7.2 4.6 SMMMMFF F%%... 6.9 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) 6-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000