SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 12 October, 2026 T-index: 20 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 12.8 13.8 7.7 ASSXMB BBP%%... 7.9 9.0 4.5 00 01 13.1 15.2 8.4 ASSXXB BBBPP... 7.9 10.0 4.9 01 02 13.4 16.1 8.8 SSSXX BBBPPP... 8.1 10.6 5.1 02 03 13.9 16.6 9.0 SSSXX BBBPPP%.. 8.3 11.0 5.3 03 04 14.1 16.8 9.1 SSSXX XBBBPP%... 8.6 11.2 5.3 04 05 14.2 16.6 9.0 SSSXX XBBBPP%%.. 8.8 11.1 5.3 05 06 13.7 16.1 8.8 SSSXX BBBPPP%... 8.7 10.8 5.1 06 07 13.7 15.3 8.4 ASSSXX BBBPP%... 8.5 10.2 4.9 07 08 13.1 13.9 7.8 ASSXXM BBB%%.... 8.2 9.3 4.5 08 09 13.1 11.8 6.8 ASSXMMM BFF%%%... 8.2 7.8 4.0 09 10 11.4 7.5 4.7 ASMMMMMF F%%%%.... 7.7 4.2 3.0 10 11 9.3 1.9 0.0 XMMMMMMMM% %%%...... 6.6 1.3 0.0 11 12 7.8 1.9 0.0 XMMMMMM%%% %..... 5.7 1.3 0.0 12 13 7.1 1.9 0.0 XMMMMMM%%% .... 5.2 1.3 0.0 13 14 6.9 1.9 0.0 XMMMMM%%%. ... 5.0 1.3 0.0 14 15 7.1 1.9 0.0 XMMMMMF%%. .. 5.0 1.3 0.0 15 16 7.0 1.9 0.0 XMMMMM%%%. .. 4.9 1.3 0.0 16 17 6.8 1.9 0.0 XMMMMM%%%. .. 4.8 1.3 0.0 17 18 6.0 1.9 0.0 XMMMM%%%.. . 4.5 1.3 0.0 18 19 5.3 1.9 0.0 XMMMM%%... 4.0 1.3 0.0 19 20 5.0 1.9 0.0 XMMMM%... 3.9 1.3 0.0 20 21 5.5 1.9 0.0 XMMMM%%... 4.3 1.3 0.0 21 22 8.7 6.5 4.1 ASMMMF%% %... 6.0 3.7 2.6 22 23 11.8 11.5 6.7 ASSXMMB B%%%... 7.5 7.5 3.9 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) 12-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000