SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 13 October, 2026 T-index: 35 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 13.7 14.1 8.0 ASSXXM BBBP%%... 8.4 9.3 4.7 00 01 14.0 15.5 8.6 ASSSXX BBBPP%%.. 8.4 10.3 5.0 01 02 14.2 16.4 9.1 SSSXX BBBBPP%... 8.6 10.9 5.3 02 03 14.7 17.0 9.3 SSSXX XBBBPPP%.. 8.9 11.3 5.4 03 04 15.3 17.2 9.4 ASSSX XBBBBPP%.. . 9.2 11.4 5.5 04 05 15.3 17.0 9.3 SSSSX XBBBBPP%.. . 9.4 11.3 5.4 05 06 14.6 16.5 9.1 SSSSX MBBBPP%%.. . 9.1 11.0 5.3 06 07 14.4 15.6 8.7 ASSSXX MBBBP%%... 8.8 10.5 5.0 07 08 13.9 14.3 8.0 ASSXXM BBBP%%.... 8.6 9.5 4.7 08 09 14.0 12.1 7.0 SSXMMM BBF%%%%... 8.6 8.0 4.1 09 10 12.1 7.8 4.8 SMMMMMM FF%%%%.... 8.1 4.3 3.1 10 11 10.0 2.0 0.0 XMMMMMMMM% %%%%...... 6.9 1.3 0.0 11 12 8.5 2.0 0.0 XMMMMMMM%% %%..... 6.1 1.3 0.0 12 13 7.9 2.0 0.0 XMMMMMM%%% %..... 5.7 1.3 0.0 13 14 7.8 2.0 0.0 XMMMMMM%%% .... 5.4 1.3 0.0 14 15 8.0 2.0 0.0 XMMMMMM%%% .... 5.5 1.3 0.0 15 16 7.7 2.0 0.0 XMMMMMF%%% ... 5.3 1.3 0.0 16 17 7.5 2.0 0.0 XMMMMMF%%. ... 5.2 1.3 0.0 17 18 6.5 2.0 0.0 XMMMMM%%.. .. 4.9 1.3 0.0 18 19 5.8 2.0 0.0 XMMMM%%%.. . 4.3 1.3 0.0 19 20 5.4 2.0 0.0 XMMMM%%... 4.2 1.3 0.0 20 21 6.0 2.0 0.0 XMMMM%%%.. . 4.6 1.3 0.0 21 22 9.3 6.8 4.3 ASMMMFF% %%... 6.3 3.9 2.7 22 23 12.7 11.8 6.9 SSXMMB BF%%%... 7.9 7.7 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) 13-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000