SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 14 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 28-32 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.1 12.2 7.2 SSSMMM MBFFF%%... . 9.6 7.7 4.4 00 01 16.9 14.4 8.2 ASSSXM MMBBFF%%%% ... 10.7 9.3 4.9 01 02 16.8 15.6 8.8 SSSXX MMMBBF%%%% .... 11.1 10.2 5.2 02 03 16.6 16.3 9.1 SSSSX MMMBBB%%%% ..... 11.1 10.7 5.4 03 04 15.6 16.5 9.2 SSSSX MMBBBP%%%. ... 10.4 10.9 5.4 04 05 15.5 16.3 9.1 SSSSX MMBBBP%%%. ... 10.2 10.8 5.4 05 06 15.0 15.7 8.8 SSSXX MMBBP%%%.. ... 10.0 10.4 5.2 06 07 15.0 14.5 8.3 ASSSXM MMBB%%%%.. ... 9.9 9.6 4.8 07 08 14.8 12.5 7.3 SSSXMM MBFF%%%%.. ... 9.8 8.3 4.3 08 09 14.5 8.4 5.2 SSMMMMM MFFF%%%... .. 9.7 5.5 3.1 09 10 11.1 2.3 0.0 XMMMMMMMMF F%%%..... 7.7 1.5 0.0 10 11 8.4 2.3 0.0 XMMMMMMF%% %..... 6.0 1.5 0.0 11 12 7.2 2.3 0.0 XMMMMMF%%. .... 5.2 1.5 0.0 12 13 6.6 2.3 0.0 XMMMMM%%%. ... 4.8 1.5 0.0 13 14 6.1 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 5.9 2.3 0.0 XMMMM%%... 4.3 1.5 0.0 22 23 10.9 7.5 4.8 SMMMFFF %%%.. 6.7 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) 14-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000