SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 15 July, 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 12-15 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 15.4 12.4 7.3 SSSMMM MBFFF%%%.. . 9.7 7.8 4.4 00 01 17.2 14.5 8.3 ASSSXM MMBBFFF%%% .... 10.9 9.4 4.9 01 02 17.3 15.7 8.9 SSSXX MMMBBFF%%% ..... 11.3 10.3 5.2 02 03 17.2 16.4 9.2 SSSSX MMMBBBF%%% ..... 11.2 10.8 5.4 03 04 16.1 16.6 9.3 ASSSX MMBBBB%%%. .... 10.7 11.0 5.5 04 05 15.9 16.4 9.2 SSSSX MMBBBP%%%. .... 10.5 10.9 5.4 05 06 15.2 15.8 8.9 SSSXX MMBBB%%%.. ... 10.1 10.5 5.2 06 07 15.2 14.6 8.4 ASSSXM MMBBF%%%.. ... 9.9 9.7 4.9 07 08 15.0 12.6 7.4 SSSXMM MMFF%%%%.. ... 9.9 8.4 4.3 08 09 14.8 8.5 5.3 SSMMMMM MMFF%%%%.. ... 9.8 5.6 3.1 09 10 11.3 2.3 0.0 XMMMMMMMMF F%%%..... 7.8 1.5 0.0 10 11 8.6 2.3 0.0 XMMMMMMF%% %..... 6.1 1.5 0.0 11 12 7.4 2.3 0.0 XMMMMMF%%% .... 5.3 1.5 0.0 12 13 6.7 2.3 0.0 XMMMMM%%%. ... 4.9 1.5 0.0 13 14 6.2 2.3 0.0 XMMMMF%%.. .. 4.6 1.5 0.0 14 15 5.9 2.3 0.0 XMMMM%%%.. . 4.5 1.5 0.0 15 16 5.9 2.3 0.0 XMMMM%%%.. . 4.5 1.5 0.0 16 17 5.7 2.3 0.0 XMMMM%%%.. . 4.4 1.5 0.0 17 18 5.5 2.3 0.0 XMMMM%%... . 4.1 1.5 0.0 18 19 5.3 2.3 0.0 XMMMM%%... . 3.9 1.5 0.0 19 20 4.9 2.3 0.0 XMMM%%%... 3.5 1.5 0.0 20 21 4.9 2.3 0.0 XMMM%%%... 3.5 1.5 0.0 21 22 6.0 2.3 0.0 XMMMM%%... 4.3 1.5 0.0 22 23 11.0 7.6 4.9 SMMMFFF %%%.. 6.8 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) 15-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000