SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 22 October, 2026 T-index: 50 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 29-37 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 13.9 14.5 8.3 ASSSXM BBBP%%%... 8.5 9.6 4.8 00 01 14.1 15.9 8.9 SSSXX BBBBP%%... 8.6 10.5 5.2 01 02 14.6 16.9 9.4 ASSXX XBBBPP%... . 8.9 11.2 5.5 02 03 15.5 17.4 9.6 ASSSX XBBBBPP%.. .. 9.3 11.6 5.6 03 04 16.0 17.6 9.7 ASSSX XMBBBPP%%. ... 9.7 11.7 5.6 04 05 16.2 17.4 9.6 ASSSX XMBBBBP%%. ... 9.9 11.6 5.6 05 06 15.5 16.9 9.4 SSSSX XMBBBP%%%. .. 9.6 11.3 5.4 06 07 14.9 16.1 9.0 SSSXX MBBBPP%%.. .. 9.2 10.8 5.2 07 08 14.3 14.7 8.3 ASSSXM MBBB%%%... . 9.0 9.8 4.9 08 09 14.5 12.6 7.3 SSSXMM MBFF%%%%.. . 9.0 8.3 4.3 09 10 12.7 8.6 5.3 SSMMMMM MF%%%%%... .. 8.5 5.0 3.3 10 11 11.0 2.1 0.0 XMMMMMMMMM %%%%%%.... . 7.6 1.4 0.0 11 12 9.6 2.1 0.0 XMMMMMMMM% %%%%..... 6.9 1.4 0.0 12 13 8.8 2.1 0.0 XMMMMMMM%% %%%.... 6.2 1.4 0.0 13 14 8.8 2.1 0.0 XMMMMMMF%% %%.... 6.0 1.4 0.0 14 15 9.0 2.1 0.0 XMMMMMMF%% %%.... 6.0 1.4 0.0 15 16 8.7 2.1 0.0 XMMMMMMF%% %.... 5.8 1.4 0.0 16 17 8.3 2.1 0.0 XMMMMMMF%% %... 5.6 1.4 0.0 17 18 7.2 2.1 0.0 XMMMMMF%%. ... 5.3 1.4 0.0 18 19 6.4 2.1 0.0 XMMMMM%%%. .. 4.8 1.4 0.0 19 20 6.1 2.1 0.0 XMMMMF%%.. . 4.7 1.4 0.0 20 21 6.7 2.1 0.0 XMMMMM%%%. .. 5.0 1.4 0.0 21 22 10.1 7.9 5.0 ASMMMMFF %%%... 6.7 4.9 3.0 22 23 13.1 12.3 7.2 SSSXMB BBF%%%.. 8.1 8.1 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) 22-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000