SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 20 June, 2026 T-index: 75 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 16.1 12.1 7.1 SSSMMM MBFFFF%%%. .. 10.1 7.6 4.3 00 01 17.8 14.3 8.2 ASSSXM MMMBFFF%%% %.... 11.4 9.2 4.9 01 02 18.3 15.5 8.8 SSSXX MMMMBFFF%% %..... 11.9 10.2 5.2 02 03 17.7 16.2 9.1 SSSSX MMMBBBF%%% %..... 11.7 10.7 5.4 03 04 17.1 16.5 9.2 SSSSX MMMBBBF%%% ..... 11.4 10.9 5.4 04 05 16.7 16.3 9.1 SSSSX MMMBBB%%%% ..... 11.0 10.8 5.4 05 06 16.5 15.6 8.8 SSSXX MMMBBF%%%% ..... 10.9 10.4 5.2 06 07 16.9 14.4 8.3 ASSSXM MMMBFF%%%% ...... 10.8 9.6 4.8 07 08 16.4 12.4 7.3 SSSXMM MMMFFF%%%% ..... 10.7 8.2 4.3 08 09 14.8 7.9 5.0 ASXMMMMM MFFF%%%%.. ... 9.8 5.1 3.0 09 10 11.8 2.3 0.0 XMMMMMMMMF F%%%%..... 8.1 1.5 0.0 10 11 8.5 2.3 0.0 XMMMMMMF%% %..... 6.1 1.5 0.0 11 12 7.2 2.3 0.0 XMMMMMF%%. .... 5.2 1.5 0.0 12 13 6.8 2.3 0.0 XMMMMM%%%. ... 4.9 1.5 0.0 13 14 6.5 2.3 0.0 XMMMMM%%.. .. 4.7 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 6.1 2.3 0.0 XMMMMM%%.. . 4.6 1.5 0.0 17 18 5.9 2.3 0.0 XMMMMM%%.. .. 4.4 1.5 0.0 18 19 5.8 2.3 0.0 XMMMMM%%.. .. 4.3 1.5 0.0 19 20 5.6 2.3 0.0 XMMMM%%%.. . 3.9 1.5 0.0 20 21 5.3 2.3 0.0 XMMMM%%... . 3.8 1.5 0.0 21 22 6.3 2.3 0.0 XMMMMF%%.. . 4.5 1.5 0.0 22 23 11.6 6.9 4.4 SMMMMFF F%%... 7.1 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) 20-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000