SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 27 June, 2026 T-index: 80 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-9 1E 0 1 5 10 15 20 25 30 35 40 2F 21-24 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 19.9 0.0 9.0 ASSXM MMMMFFFFF% %%%..... 12.4 9.6 5.7 00 01 21.4 0.0 10.1 SSSS XMMMMMFFFF F%%%%..... 13.7 11.5 6.2 01 02 21.5 0.0 10.7 ASSS XXMMMMFFFF F%%%%..... . 14.2 12.5 6.6 02 03 20.8 0.0 11.1 ASSS SXXMMMFFFF %%%%%..... 14.1 13.1 6.7 03 04 20.0 0.0 11.2 ASSS SXXMMMFFF% %%%%..... 13.7 13.3 6.7 04 05 19.7 0.0 11.0 ASSS XXXMMFFFF% %%%...... 13.3 13.1 6.6 05 06 19.4 0.0 10.6 SSSS XXMMMFFFF% %%%...... 13.1 12.6 6.3 06 07 19.5 0.0 9.8 ASSSX XMMMMFFFF% %%%....... 12.8 11.6 5.8 07 08 18.9 0.0 8.4 ASSSXM MMMMMFFF%% %%....... 12.6 9.7 5.0 08 09 17.2 0.0 4.4 SMMMMMM MMMMFFF%%% ...... 11.8 0.0 3.1 09 10 13.5 0.0 0.0 XMMMMMMMMM MFF%%%%... ... 9.6 1.9 0.0 10 11 9.9 0.0 0.0 XMMMMMMMM% %%%...... 7.4 1.9 0.0 11 12 8.6 0.0 0.0 XMMMMMMM%% %..... 6.4 1.9 0.0 12 13 8.2 0.0 0.0 XMMMMMMF%% %.... 6.0 1.9 0.0 13 14 7.6 0.0 0.0 XMMMMMM%%% .... 5.7 1.9 0.0 14 15 7.2 0.0 0.0 XMMMMMF%%% .... 5.5 1.9 0.0 15 16 7.0 0.0 0.0 XMMMMM%%%. ... 5.5 1.9 0.0 16 17 7.0 0.0 0.0 XMMMMMM%%. ... 5.5 1.9 0.0 17 18 6.8 0.0 0.0 XMMMMMM%%. ... 5.2 1.9 0.0 18 19 6.5 0.0 0.0 XMMMMM%%%. .... 4.8 1.9 0.0 19 20 6.0 0.0 0.0 XMMMMM%%%. ... 4.4 1.9 0.0 20 21 5.9 0.0 0.0 XMMMMM%%.. .. 4.5 1.9 0.0 21 22 8.3 0.0 0.0 XMMMMMFF%% %... 5.5 1.9 0.0 22 23 15.1 0.0 6.8 ASMMMM FFFFF%%%.. . 9.0 0.0 4.7 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) 27-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000