SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 24 July, 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 12-15 1E 2 1 5 10 15 20 25 30 35 40 2F 28-33 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.2 12.5 7.3 SSSMMM MBFFF%%%.. . 9.6 7.9 4.4 00 01 17.0 14.5 8.3 ASSSXM MMBBFF%%%% ... 10.7 9.4 4.9 01 02 16.9 15.7 8.9 SSSXX MMMBBF%%%% .... 11.1 10.3 5.2 02 03 16.8 16.4 9.2 SSSSX MMMBBB%%%% ..... 11.1 10.8 5.4 03 04 15.8 16.6 9.3 ASSSX MMBBBP%%%. .... 10.5 11.0 5.5 04 05 15.6 16.5 9.2 SSSSX MMBBBP%%%. ... 10.3 10.9 5.4 05 06 15.1 15.8 8.9 SSSXX MMBBB%%%.. ... 10.0 10.5 5.2 06 07 15.0 14.7 8.4 ASSSXM MMBB%%%%.. ... 9.9 9.8 4.9 07 08 14.8 12.7 7.4 SSSXMM MBFF%%%%.. ... 9.8 8.5 4.3 08 09 14.6 8.9 5.5 SSMMMMM MFFF%%%%.. ... 9.8 5.9 3.2 09 10 11.5 2.3 0.0 XMMMMMMMMF F%%%...... 7.9 1.5 0.0 10 11 8.8 2.3 0.0 XMMMMMMF%% %...... 6.2 1.5 0.0 11 12 7.5 2.3 0.0 XMMMMMF%%% .... 5.4 1.5 0.0 12 13 6.9 2.3 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 13 14 6.4 2.3 0.0 XMMMMM%%.. .. 4.8 1.5 0.0 14 15 6.1 2.3 0.0 XMMMMF%%.. . 4.6 1.5 0.0 15 16 6.1 2.3 0.0 XMMMMF%%.. . 4.6 1.5 0.0 16 17 5.9 2.3 0.0 XMMMM%%%.. . 4.6 1.5 0.0 17 18 5.7 2.3 0.0 XMMMM%%%.. . 4.3 1.5 0.0 18 19 5.5 2.3 0.0 XMMMM%%%.. . 4.0 1.5 0.0 19 20 5.0 2.3 0.0 XMMM%%%... 3.6 1.5 0.0 20 21 4.9 2.3 0.0 XMMM%%%... 3.5 1.5 0.0 21 22 5.9 2.3 0.0 XMMMM%%... 4.3 1.5 0.0 22 23 11.3 8.1 5.1 SSMMMFF F%%... 7.0 3.7 3.4 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-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000