SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 20 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 12-18 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 13.8 14.4 8.2 ASSSXM BBBP%%%.. 8.4 9.5 4.8 00 01 14.0 15.8 8.8 SSSXX BBBPP%%... 8.5 10.5 5.2 01 02 14.4 16.7 9.3 SSSXX XBBBPP%... 8.8 11.1 5.4 02 03 15.3 17.3 9.5 ASSSX XBBBBPP%.. . 9.2 11.5 5.5 03 04 15.9 17.5 9.6 ASSSX XBBBBPP%%. .. 9.6 11.6 5.6 04 05 16.0 17.3 9.5 ASSSX XMBBBPP%%. .. 9.8 11.5 5.5 05 06 15.3 16.8 9.3 SSSSX XMBBBP%%.. .. 9.6 11.2 5.4 06 07 14.8 15.9 8.9 SSSXX MBBBP%%%.. . 9.2 10.7 5.2 07 08 14.2 14.6 8.3 ASSSXM MBBB%%%... . 8.9 9.7 4.8 08 09 14.5 12.5 7.2 SSSXMM MBFF%%%... . 8.9 8.2 4.3 09 10 12.7 8.4 5.2 SSMMMMM FF%%%%%... . 8.5 4.9 3.3 10 11 10.8 2.1 0.0 XMMMMMMMMM %%%%%..... . 7.4 1.4 0.0 11 12 9.3 2.1 0.0 XMMMMMMMM% %%%..... 6.7 1.4 0.0 12 13 8.6 2.1 0.0 XMMMMMMM%% %%..... 6.0 1.4 0.0 13 14 8.5 2.1 0.0 XMMMMMMF%% %%.... 5.8 1.4 0.0 14 15 8.7 2.1 0.0 XMMMMMMF%% %.... 5.9 1.4 0.0 15 16 8.4 2.1 0.0 XMMMMMMF%% %.... 5.7 1.4 0.0 16 17 8.0 2.1 0.0 XMMMMMM%%% .... 5.5 1.4 0.0 17 18 7.0 2.1 0.0 XMMMMM%%%. .. 5.2 1.4 0.0 18 19 6.2 2.1 0.0 XMMMMM%%.. . 4.6 1.4 0.0 19 20 5.9 2.1 0.0 XMMMM%%%.. . 4.6 1.4 0.0 20 21 6.5 2.1 0.0 XMMMMM%%%. .. 4.9 1.4 0.0 21 22 9.8 7.7 4.8 ASMMMMF% %%.... 6.6 4.7 2.9 22 23 12.9 12.2 7.1 SSSMMB BB%%%%.. 8.0 8.0 4.2 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) 20-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000