SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 23 May, 2026 T-index: 55 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-8 1E 0 1 5 10 15 20 25 30 35 40 2F 21-23 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.4 0.0 8.8 ASSXM MMMMFFFFF% %%..... 12.3 9.7 5.5 00 01 21.0 0.0 9.8 SSSX XMMMMFFFFF %%%%..... 13.4 11.4 6.1 01 02 20.4 0.0 10.4 SSSS XXMMMMFFFF %%%%...... 13.7 12.4 6.4 02 03 19.2 0.0 10.7 ASSS XXMMMMFFF% %%%%..... 13.1 12.9 6.5 03 04 18.9 0.0 10.8 ASSS XXXMMFFF%% %%%...... 13.0 13.1 6.5 04 05 18.7 0.0 10.7 SSSS XXMMMFFF%% %%%...... 13.0 12.9 6.4 05 06 18.8 0.0 10.3 SSSS XXMMMFFF%% %%%...... 12.8 12.4 6.1 06 07 19.0 0.0 9.5 ASSSX XMMMMFFF%% %%%%...... 12.6 11.5 5.7 07 08 18.2 0.0 8.3 ASSSXM MMMMMFFF%% %%%...... 12.3 9.6 5.0 08 09 16.2 0.0 5.2 SSMMMMM MMMFFF%%%% ...... 11.1 4.7 3.4 09 10 12.4 0.0 0.0 XMMMMMMMMM MF%%%%.... . 9.1 1.7 0.0 10 11 10.0 0.0 0.0 XMMMMMMMM% %%%..... 7.2 1.7 0.0 11 12 8.5 0.0 0.0 XMMMMMMM%% %..... 6.3 1.7 0.0 12 13 8.2 0.0 0.0 XMMMMMMF%% ..... 5.9 1.7 0.0 13 14 7.8 0.0 0.0 XMMMMMM%%% ..... 5.7 1.7 0.0 14 15 7.5 0.0 0.0 XMMMMMM%%% .... 5.7 1.7 0.0 15 16 7.6 0.0 0.0 XMMMMMM%%% .... 5.7 1.7 0.0 16 17 7.4 0.0 0.0 XMMMMMM%%% .... 5.6 1.7 0.0 17 18 7.1 0.0 0.0 XMMMMMM%%% .... 5.4 1.7 0.0 18 19 6.6 0.0 0.0 XMMMMM%%%% .... 4.8 1.7 0.0 19 20 6.2 0.0 0.0 XMMMMM%%%. ... 4.4 1.7 0.0 20 21 5.9 0.0 0.0 XMMMMM%%%. ... 4.6 1.7 0.0 21 22 8.3 0.0 0.0 XMMMMMFF%% %... 5.6 1.7 0.0 22 23 15.8 0.0 6.9 ASMMMM MFFFF%%%.. .. 9.6 5.7 4.6 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) 23-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000