SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 29 September, 2026 T-index: 55 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-16 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 15.4 14.2 8.1 ASSSXM MBBBF%%%.. . 9.4 9.3 4.8 00 01 16.1 15.7 8.8 SSSXX MBBBBF%%%. .. 9.5 10.4 5.2 01 02 16.3 16.7 9.3 SSSSX XBBBBB%%%. .. 9.6 11.1 5.4 02 03 16.5 17.3 9.6 ASSSX XMBBBBP%%. .. 9.9 11.5 5.6 03 04 16.9 17.5 9.7 ASSSX XMBBBBP%%% ... 10.1 11.6 5.6 04 05 16.7 17.3 9.6 ASSSX XMBBBBP%%. ... 10.2 11.5 5.6 05 06 15.7 16.8 9.3 SSSSX XMBBBP%%%. .. 9.8 11.2 5.4 06 07 15.0 15.8 8.9 SSSXX MBBBP%%%.. . 9.3 10.6 5.2 07 08 14.6 14.4 8.2 ASSSXM MBBB%%%%.. . 9.1 9.6 4.8 08 09 14.6 12.0 7.1 SSSMMM MBFF%%%%.. . 9.0 7.9 4.2 09 10 12.5 6.3 4.1 ASMMMMMM FF%%%%%... . 8.3 0.0 2.8 10 11 10.1 2.2 0.0 XMMMMMMMMF %%%%%..... 7.0 1.4 0.0 11 12 8.9 2.2 0.0 XMMMMMMM%% %%%..... 6.4 1.4 0.0 12 13 8.3 2.2 0.0 XMMMMMMM%% %%..... 5.9 1.4 0.0 13 14 8.2 2.2 0.0 XMMMMMMF%% %..... 5.7 1.4 0.0 14 15 8.5 2.2 0.0 XMMMMMMF%% %.... 5.7 1.4 0.0 15 16 8.2 2.2 0.0 XMMMMMMF%% %... 5.5 1.4 0.0 16 17 7.7 2.2 0.0 XMMMMMF%%% .... 5.3 1.4 0.0 17 18 6.9 2.2 0.0 XMMMMM%%%. .. 5.1 1.4 0.0 18 19 6.2 2.2 0.0 XMMMMM%%.. . 4.5 1.4 0.0 19 20 5.7 2.2 0.0 XMMMM%%%.. . 4.3 1.4 0.0 20 21 6.0 2.2 0.0 XMMMM%%%.. . 4.6 1.4 0.0 21 22 9.0 3.9 2.7 MMMMMF%% %... 6.0 0.0 2.3 22 23 13.5 11.7 6.9 SSXMMM BFF%%%.. 8.3 7.5 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) 29-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000