SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 25 October, 2025 T-index: 115 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 8-13 1E 0 1 5 10 15 20 25 30 35 40 2F 22-31 2E 6 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 21.2 0.0 11.3 ASSS SXMMFFFFFF F%%%... 12.3 12.7 6.9 00 01 21.5 0.0 12.1 SSS SSXMFFFFFF F%%%.... 12.5 13.9 7.3 01 02 21.8 0.0 12.6 ASS SSXXMFFFFF F%%%.... 12.8 14.7 7.6 02 03 22.8 0.0 12.9 ASS SSXXXFFFFF FF%%%.... 13.2 15.2 7.7 03 04 23.4 0.0 13.0 ASS SSXXXMFFFF FFF%%%.... 13.5 15.3 7.7 04 05 23.3 0.0 12.8 ASS SSXXXMFFFF FFF%%%... 13.7 15.2 7.6 05 06 22.2 0.0 12.5 ASS SSXXMMFFFF FF%%%.... 13.4 14.7 7.5 06 07 21.2 0.0 11.9 SSS SXXMMFFFFF F%%%.... 12.8 13.8 7.1 07 08 20.6 0.0 10.9 ASSS XXMMMFFFFF %%%%... 12.5 12.3 6.6 08 09 20.9 0.0 9.4 ASSSM MMMMMFFFFF %%%%.... 12.7 9.9 5.9 09 10 19.1 0.0 5.9 SMMMMM MMMMFFFFF% %%%.... 12.4 0.0 4.4 10 11 17.4 0.0 0.0 XXMMMMMMMM MMMFFFF%%% %...... 11.6 2.1 0.0 11 12 16.4 0.0 0.0 XXMMMMMMMM MMFFFF%%%% ..... 10.7 2.1 0.0 12 13 15.7 0.0 0.0 XXMMMMMMMM MMFFF%%%%. .... 10.0 2.1 0.0 13 14 15.3 0.0 0.0 XXMMMMMMMM MFFFF%%%%. .... 9.4 2.1 0.0 14 15 15.0 0.0 0.0 XXMMMMMMMM MFFF%%%%.. .... 9.0 2.1 0.0 15 16 14.4 0.0 0.0 XXMMMMMMMM FFFF%%%%.. ... 8.7 2.1 0.0 16 17 13.2 0.0 0.0 XXMMMMMMMM FFF%%%.... . 8.3 2.1 0.0 17 18 11.4 0.0 0.0 XXMMMMMMMF F%%%..... 7.7 2.1 0.0 18 19 10.1 0.0 0.0 XXMMMMMMFF %%%..... 7.1 2.1 0.0 19 20 9.9 0.0 0.0 XXMMMMMMF% %%%.... 6.9 2.1 0.0 20 21 11.3 0.0 0.0 XXMMMMMMMF F%%%%..... 7.4 2.1 0.0 21 22 15.9 0.0 7.8 ASSMMM MFFFF%%%%. .... 9.8 7.4 4.9 22 23 20.0 0.0 10.1 SSSS MMMFFFFFF% %%%... 11.5 10.9 6.2 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) 25-Oct-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000