SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 24 October, 2026 T-index: 30 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 28-36 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 12.7 14.2 8.0 ASSXXB BBPP%... 7.9 9.3 4.7 00 01 13.0 15.5 8.6 ASSXXX BBPPP%.. 8.0 10.3 5.0 01 02 13.7 16.4 9.0 SSSXX BBBPPP... 8.3 10.9 5.3 02 03 14.2 16.9 9.3 SSSXX XBBBPP%... 8.6 11.3 5.4 03 04 14.8 17.1 9.3 SSSXX XBBBPPP%.. . 9.0 11.4 5.4 04 05 15.0 17.0 9.3 SSSSX XBBBPPP%.. .. 9.2 11.3 5.4 05 06 14.6 16.5 9.1 SSSSX MBBBPP%%.. . 9.2 11.0 5.2 06 07 14.4 15.6 8.7 ASSSXX MBBBP%%... . 9.0 10.5 5.0 07 08 13.8 14.3 8.0 ASSXXM BBBP%%.... 8.7 9.6 4.7 08 09 13.9 12.3 7.1 SSSXMM BBF%%%%... 8.7 8.1 4.2 09 10 12.2 8.5 5.2 SSMMMMM FF%%%%.... 8.3 5.0 3.3 10 11 10.3 2.0 0.0 XMMMMMMMMF %%%%%..... 7.1 1.3 0.0 11 12 8.8 2.0 0.0 XMMMMMMM%% %%%.... 6.4 1.3 0.0 12 13 8.0 2.0 0.0 XMMMMMM%%% %..... 5.8 1.3 0.0 13 14 7.9 2.0 0.0 XMMMMMM%%% %... 5.5 1.3 0.0 14 15 8.2 2.0 0.0 XMMMMMMF%% .... 5.6 1.3 0.0 15 16 8.1 2.0 0.0 XMMMMMMF%% .... 5.5 1.3 0.0 16 17 7.7 2.0 0.0 XMMMMMF%%% ... 5.3 1.3 0.0 17 18 6.7 2.0 0.0 XMMMMM%%%. .. 5.0 1.3 0.0 18 19 6.0 2.0 0.0 XMMMM%%%.. . 4.5 1.3 0.0 19 20 5.6 2.0 0.0 XMMMM%%... 4.4 1.3 0.0 20 21 6.2 2.0 0.0 XMMMMF%%.. . 4.7 1.3 0.0 21 22 9.3 7.8 4.9 ASMMMFF% %%... 6.3 4.9 2.9 22 23 11.9 12.0 7.0 SSXMMB BP%%... 7.6 7.9 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) 24-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000