SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 19 June, 2026 T-index: 70 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 15.9 12.0 7.1 SSSMMM MBFFF%%%.. .. 9.9 7.5 4.3 00 01 17.5 14.2 8.1 ASSSXM MMMBFFF%%% .... 11.2 9.2 4.8 01 02 17.7 15.4 8.7 SSSXX MMMBBFF%%% %..... 11.7 10.1 5.2 02 03 17.1 16.1 9.0 SSSXX MMMBBBF%%% %..... 11.4 10.6 5.3 03 04 16.6 16.4 9.1 SSSSX MMMBBB%%%% ..... 11.1 10.8 5.4 04 05 16.2 16.2 9.0 SSSXX MMMBBB%%%. .... 10.7 10.7 5.3 05 06 16.3 15.5 8.7 SSSXX MMMBBF%%%% ..... 10.8 10.3 5.1 06 07 16.6 14.4 8.2 ASSSXM MMMBFF%%%% ...... 10.7 9.5 4.8 07 08 16.1 12.3 7.2 SSSXMM MMFFFF%%%. ..... 10.5 8.2 4.2 08 09 14.5 7.9 5.0 ASXMMMMM MFFF%%%... ... 9.6 5.1 2.9 09 10 11.5 2.3 0.0 XMMMMMMMMF F%%%...... 7.9 1.5 0.0 10 11 8.3 2.3 0.0 XMMMMMMF%% %..... 5.9 1.5 0.0 11 12 7.0 2.3 0.0 XMMMMM%%%. ... 5.1 1.5 0.0 12 13 6.7 2.3 0.0 XMMMMM%%%. ... 4.9 1.5 0.0 13 14 6.4 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%%%.. . 4.5 1.5 0.0 16 17 6.1 2.3 0.0 XMMMMM%%.. . 4.5 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 5.2 2.3 0.0 XMMMM%%... . 3.8 1.5 0.0 21 22 6.3 2.3 0.0 XMMMMF%%.. . 4.6 1.5 0.0 22 23 11.4 6.8 4.4 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) 19-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000