SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 24 June, 2026 T-index: 68 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 28-31 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.6 12.0 7.0 SSXMMM MBFFF%%%.. .. 9.8 7.5 4.3 00 01 17.2 14.2 8.1 ASSSXM MMMBFFF%%% .... 11.1 9.1 4.8 01 02 17.3 15.4 8.7 SSSXX MMMBBFF%%% %.... 11.5 10.1 5.1 02 03 16.9 16.1 9.0 SSSXX MMMBBB%%%% ..... 11.2 10.6 5.3 03 04 16.3 16.3 9.1 SSSSX MMMBBB%%%% .... 10.9 10.8 5.4 04 05 15.9 16.1 9.0 SSSXX MMBBBP%%%. .... 10.6 10.7 5.3 05 06 15.7 15.5 8.7 SSSXX MMBBB%%%%. .... 10.5 10.3 5.1 06 07 16.0 14.3 8.2 ASSSXM MMBBF%%%%. ..... 10.4 9.5 4.8 07 08 15.6 12.3 7.2 SSSXMM MMFFF%%%%. .... 10.2 8.1 4.2 08 09 14.2 7.8 4.9 ASXMMMMM MFFF%%%... .. 9.4 5.1 2.9 09 10 11.1 2.2 0.0 XMMMMMMMMF F%%%..... 7.8 1.5 0.0 10 11 8.2 2.2 0.0 XMMMMMMF%% %..... 5.9 1.5 0.0 11 12 7.0 2.2 0.0 XMMMMM%%%. ... 5.1 1.5 0.0 12 13 6.6 2.2 0.0 XMMMMM%%%. ... 4.8 1.5 0.0 13 14 6.3 2.2 0.0 XMMMMF%%.. .. 4.7 1.5 0.0 14 15 6.0 2.2 0.0 XMMMM%%%.. . 4.5 1.5 0.0 15 16 6.1 2.2 0.0 XMMMMF%%.. . 4.6 1.5 0.0 16 17 6.1 2.2 0.0 XMMMMF%%.. . 4.6 1.5 0.0 17 18 5.8 2.2 0.0 XMMMMM%%.. . 4.4 1.5 0.0 18 19 5.6 2.2 0.0 XMMMM%%%.. .. 4.2 1.5 0.0 19 20 5.3 2.2 0.0 XMMMM%%%.. . 3.8 1.5 0.0 20 21 5.1 2.2 0.0 XMMMM%%... . 3.7 1.5 0.0 21 22 6.1 2.2 0.0 XMMMMF%%.. 4.5 1.5 0.0 22 23 11.3 6.8 4.4 SMMMMFF F%%... 6.9 0.0 3.1 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) 24-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000