SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 25 May, 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 16.6 12.4 7.2 SSSMMM MMFFFF%%%. ... 10.5 7.8 4.4 00 01 18.6 14.4 8.2 ASSSXM MMMBFFFF%% %%.... 11.8 9.4 4.9 01 02 18.6 15.7 8.8 SSSXX MMMMBFFF%% %%..... 12.3 10.3 5.2 02 03 18.2 16.3 9.1 SSSSX MMMMBBFF%% %%..... 11.9 10.8 5.4 03 04 17.7 16.6 9.2 SSSSX MMMMBBF%%% %...... 11.6 11.0 5.4 04 05 17.3 16.4 9.2 SSSSX MMMBBBF%%% %..... 11.5 10.9 5.4 05 06 17.5 15.8 8.9 SSSXX MMMBBFF%%% %...... 11.5 10.5 5.2 06 07 17.8 14.6 8.3 ASSSXM MMMMFFF%%% %....... 11.5 9.7 4.9 07 08 17.4 12.6 7.4 SSSXMM MMMFFFF%%% %...... 11.3 8.4 4.3 08 09 15.9 8.6 5.4 SSMMMMM MMFFF%%%%. ..... 10.5 5.7 3.1 09 10 12.4 2.3 0.0 XMMMMMMMMM FF%%%..... . 8.5 1.5 0.0 10 11 9.6 2.3 0.0 XMMMMMMMF% %%...... 6.6 1.5 0.0 11 12 8.0 2.3 0.0 XMMMMMM%%% ..... 5.6 1.5 0.0 12 13 7.3 2.3 0.0 XMMMMMF%%. .... 5.1 1.5 0.0 13 14 6.9 2.3 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 14 15 6.4 2.3 0.0 XMMMMM%%.. .. 4.8 1.5 0.0 15 16 6.4 2.3 0.0 XMMMMM%%%. .. 4.8 1.5 0.0 16 17 6.3 2.3 0.0 XMMMMM%%.. .. 4.7 1.5 0.0 17 18 6.2 2.3 0.0 XMMMMM%%.. .. 4.6 1.5 0.0 18 19 6.0 2.3 0.0 XMMMMM%%.. .. 4.3 1.5 0.0 19 20 5.8 2.3 0.0 XMMMM%%%.. .. 4.0 1.5 0.0 20 21 5.4 2.3 0.0 XMMMM%%%.. . 4.0 1.5 0.0 21 22 6.5 2.3 0.0 XMMMMF%%.. . 4.6 1.5 0.0 22 23 12.7 7.8 4.9 SMMMMMF FF%%%... 7.8 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) 25-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000