SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 12 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 28-31 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 16.7 12.2 7.2 SSSMMM MMFFFF%%%. ... 10.4 7.6 4.4 00 01 18.5 14.4 8.3 ASSSXM MMMBFFFF%% %..... 11.8 9.3 4.9 01 02 19.0 15.7 8.9 SSSXX MMMMBFFF%% %%..... 12.3 10.2 5.3 02 03 18.5 16.4 9.2 SSSSX MMMMBBFF%% %%..... 12.2 10.8 5.4 03 04 18.0 16.6 9.3 ASSSX MMMMBBF%%% %..... 11.9 11.0 5.5 04 05 17.5 16.4 9.2 SSSSX MMMBBBF%%% ..... 11.5 10.9 5.4 05 06 17.5 15.8 8.9 SSSXX MMMBBFF%%% %..... 11.5 10.4 5.2 06 07 17.9 14.5 8.3 ASSSXM MMMBFFF%%% %...... 11.4 9.7 4.9 07 08 17.4 12.5 7.4 SSSXMM MMMFFFF%%% %..... 11.2 8.3 4.3 08 09 15.5 8.1 5.1 ASSMMMMM MMFFF%%%.. .... 10.2 5.3 3.0 09 10 12.5 2.3 0.0 XMMMMMMMMM FF%%%..... . 8.5 1.5 0.0 10 11 9.1 2.3 0.0 XMMMMMMMF% %%..... 6.4 1.5 0.0 11 12 7.5 2.3 0.0 XMMMMMF%%% .... 5.4 1.5 0.0 12 13 7.1 2.3 0.0 XMMMMMF%%. ... 5.1 1.5 0.0 13 14 6.7 2.3 0.0 XMMMMM%%%. ... 4.9 1.5 0.0 14 15 6.2 2.3 0.0 XMMMMF%%.. .. 4.7 1.5 0.0 15 16 6.1 2.3 0.0 XMMMMM%%.. . 4.7 1.5 0.0 16 17 6.2 2.3 0.0 XMMMMM%%.. .. 4.7 1.5 0.0 17 18 6.0 2.3 0.0 XMMMMM%%.. .. 4.6 1.5 0.0 18 19 6.0 2.3 0.0 XMMMMM%%.. .. 4.4 1.5 0.0 19 20 5.7 2.3 0.0 XMMMM%%%.. .. 4.0 1.5 0.0 20 21 5.4 2.3 0.0 XMMMM%%%.. . 3.9 1.5 0.0 21 22 6.4 2.3 0.0 XMMMMF%%.. . 4.6 1.5 0.0 22 23 12.1 7.1 4.6 SMMMMFF FF%%... 7.3 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) 12-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000