SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 3 October, 2026 T-index: 45 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-17 1E 2 1 5 10 15 20 25 30 35 40 2F 28-35 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.5 14.1 8.0 ASSXXM BBBB%%%... 8.9 9.2 4.7 00 01 15.0 15.6 8.7 SSSXX MBBBP%%%.. . 9.1 10.3 5.1 01 02 15.3 16.6 9.2 SSSSX MBBBBP%%.. . 9.1 11.0 5.4 02 03 15.5 17.1 9.4 ASSSX XBBBBPP%.. . 9.4 11.3 5.5 03 04 15.9 17.3 9.5 ASSSX XMBBBPP%%. .. 9.6 11.5 5.5 04 05 15.8 17.1 9.4 ASSSX XMBBBPP%%. .. 9.8 11.4 5.5 05 06 15.0 16.6 9.2 SSSSX XBBBPP%%.. . 9.5 11.1 5.3 06 07 14.5 15.7 8.8 SSSXX MBBBP%%... . 9.1 10.5 5.1 07 08 14.1 14.3 8.1 ASSSXM MBBB%%%... 8.9 9.6 4.7 08 09 14.1 12.0 7.0 SSXMMM MBFF%%%... 8.8 7.9 4.1 09 10 12.1 6.8 4.3 ASMMMMMM FF%%%%.... . 8.1 3.2 2.9 10 11 9.8 2.1 0.0 XMMMMMMMM% %%%%...... 6.9 1.4 0.0 11 12 8.6 2.1 0.0 XMMMMMMM%% %%..... 6.2 1.4 0.0 12 13 8.0 2.1 0.0 XMMMMMM%%% %%.... 5.7 1.4 0.0 13 14 7.8 2.1 0.0 XMMMMMM%%% %.... 5.5 1.4 0.0 14 15 8.1 2.1 0.0 XMMMMMMF%% .... 5.5 1.4 0.0 15 16 7.8 2.1 0.0 XMMMMMF%%% .... 5.4 1.4 0.0 16 17 7.5 2.1 0.0 XMMMMMF%%% ... 5.2 1.4 0.0 17 18 6.6 2.1 0.0 XMMMMM%%%. .. 4.9 1.4 0.0 18 19 5.9 2.1 0.0 XMMMM%%%.. . 4.4 1.4 0.0 19 20 5.5 2.1 0.0 XMMMM%%... 4.2 1.4 0.0 20 21 5.9 2.1 0.0 XMMMM%%%.. . 4.5 1.4 0.0 21 22 8.8 5.2 3.5 SMMMMF%% %... 6.0 0.0 2.4 22 23 12.9 11.7 6.8 SSXMMB BF%%%... 8.0 7.5 4.1 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) 3-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000