SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 11 October, 2026 T-index: 20 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-10 1E 0 1 5 10 15 20 25 30 35 40 2F 21-27 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.3 0.0 9.4 ASSSX XFFFF%%%.. .. 9.7 11.1 5.7 00 01 15.8 0.0 10.1 SSSX XXFFF%%%%. .. 9.6 12.3 6.1 01 02 16.6 0.0 10.6 SSSX XXFFFF%%%% ... 9.7 13.0 6.4 02 03 17.0 0.0 10.8 ASSX XXXFFF%%%% ... 9.9 13.4 6.5 03 04 17.2 0.0 10.9 ASSS XXXFFFF%%% %... 10.3 13.6 6.5 04 05 16.9 0.0 10.8 SSSS XXXFFF%%%% .... 10.6 13.4 6.4 05 06 16.3 0.0 10.4 SSSS XXFFFF%%%% ... 10.3 13.0 6.2 06 07 15.8 0.0 9.9 ASSSX XXFFF%%%%. ... 10.0 12.2 5.9 07 08 15.2 0.0 9.1 ASSSX MMFFF%%%.. .. 9.8 10.8 5.5 08 09 15.2 0.0 7.7 ASSXMM MMFFF%%%.. .. 9.8 8.5 4.8 09 10 12.9 0.0 3.1 MMMMMMM MF%%%%%... .. 9.1 0.0 3.3 10 11 10.4 0.0 0.0 XMMMMMMMMM %%%%%..... . 7.5 1.5 0.0 11 12 8.8 0.0 0.0 XMMMMMMMM% %%%..... 6.7 1.5 0.0 12 13 8.3 0.0 0.0 XMMMMMMM%% %%..... 6.2 1.5 0.0 13 14 8.3 0.0 0.0 XMMMMMMF%% %..... 6.0 1.5 0.0 14 15 8.6 0.0 0.0 XMMMMMMF%% %.... 6.0 1.5 0.0 15 16 8.3 0.0 0.0 XMMMMMMF%% %.... 5.8 1.5 0.0 16 17 7.9 0.0 0.0 XMMMMMM%%% .... 5.7 1.5 0.0 17 18 6.8 0.0 0.0 XMMMMM%%%. .. 5.2 1.5 0.0 18 19 6.0 0.0 0.0 XMMMMM%%.. . 4.6 1.5 0.0 19 20 5.7 0.0 0.0 XMMMMM%%.. . 4.7 1.5 0.0 20 21 6.9 0.0 0.0 XMMMMM%%%. ... 5.2 1.5 0.0 21 22 10.8 0.0 6.0 ASMMMMF %%%%... 7.5 5.5 4.0 22 23 14.3 0.0 8.3 SSSXM MFFF%%%... 9.1 9.4 5.1 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) 11-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000