SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 4 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 15.4 12.1 7.1 SSSMMM MBFFF%%%.. . 9.7 7.6 4.3 00 01 17.1 14.2 8.1 ASSSXM MMBBFFF%%% .... 10.9 9.2 4.9 01 02 17.2 15.5 8.7 SSSXX MMMBBFF%%% ..... 11.4 10.1 5.2 02 03 16.8 16.2 9.0 SSSXX MMMBBB%%%% ..... 11.2 10.6 5.3 03 04 16.0 16.4 9.2 SSSSX MMBBBP%%%. .... 10.7 10.8 5.4 04 05 15.8 16.2 9.1 SSSSX MMBBBP%%%. .... 10.4 10.7 5.3 05 06 15.5 15.6 8.8 SSSXX MMBBB%%%%. .... 10.3 10.3 5.1 06 07 15.7 14.4 8.2 ASSSXM MMBBF%%%%. .... 10.2 9.5 4.8 07 08 15.4 12.4 7.2 SSSXMM MMFFF%%%.. .... 10.1 8.2 4.2 08 09 14.5 8.0 5.0 ASXMMMMM MFFF%%%... .. 9.6 5.2 3.0 09 10 11.3 2.3 0.0 XMMMMMMMMF F%%%..... 7.7 1.5 0.0 10 11 8.3 2.3 0.0 XMMMMMMF%% %..... 6.0 1.5 0.0 11 12 7.1 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 6.2 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%%%.. . 4.6 1.5 0.0 16 17 5.9 2.3 0.0 XMMMM%%%.. . 4.5 1.5 0.0 17 18 5.6 2.3 0.0 XMMMM%%%.. . 4.2 1.5 0.0 18 19 5.5 2.3 0.0 XMMMM%%%.. . 4.1 1.5 0.0 19 20 5.2 2.3 0.0 XMMMM%%... . 3.6 1.5 0.0 20 21 5.0 2.3 0.0 XMMMM%%... 3.6 1.5 0.0 21 22 6.1 2.3 0.0 XMMMMF%%.. 4.4 1.5 0.0 22 23 11.1 7.1 4.5 SMMMMFF F%%.. 6.8 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) 4-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000