SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kununurra Perth Date: 17 September, 2025 T-index: 100 Bearings: 214 39 Distance: 2219 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 7-11 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 23.3 0.0 10.6 ASSS XMMMMMFFFF FFF%%%.... 14.4 11.8 6.5 00 01 24.2 0.0 11.5 ASSS SXXMMMMFFF FFFF%%%%.. . 14.6 13.2 7.0 01 02 24.2 0.0 12.0 SSS SXXMMMMFFF FFFF%%%... . 14.6 14.0 7.3 02 03 24.4 0.0 12.3 SSS SSXXMMMFFF FFFF%%%... . 14.5 14.5 7.4 03 04 24.3 0.0 12.4 SSS SSXXMMMFFF FFFF%%%... 14.6 14.7 7.4 04 05 23.6 0.0 12.2 SSS SSXXMMMFFF FFF%%%.... 14.5 14.6 7.3 05 06 22.3 0.0 11.9 ASSS SXXXMMFFFF FF%%%.... 13.8 14.1 7.0 06 07 21.5 0.0 11.2 ASSS SXXMMMFFFF F%%%%.... 13.4 13.1 6.7 07 08 21.5 0.0 10.1 SSSS XMMMMMFFFF F%%%%.... 13.4 11.5 6.1 08 09 21.3 0.0 8.3 SSSMM MMMMMFFFFF F%%%.... 13.3 8.5 5.2 09 10 18.5 0.0 0.0 XMMMMMMMMM MMMMMFFF%% %%%..... 12.3 2.0 0.0 10 11 15.0 0.0 0.0 XMMMMMMMMM MMMF%%%%%. ...... 10.4 2.0 0.0 11 12 13.6 0.0 0.0 XMMMMMMMMM MFF%%%%%.. ... 9.4 2.0 0.0 12 13 13.0 0.0 0.0 XMMMMMMMMM MF%%%%%... .. 8.7 2.0 0.0 13 14 12.5 0.0 0.0 XMMMMMMMMM FF%%%%.... .. 8.2 2.0 0.0 14 15 12.6 0.0 0.0 XMMMMMMMMF FF%%%%.... .. 7.9 2.0 0.0 15 16 11.8 0.0 0.0 XMMMMMMMMF F%%%%..... 7.6 2.0 0.0 16 17 10.7 0.0 0.0 XMMMMMMMMF %%%%..... 7.2 2.0 0.0 17 18 9.3 0.0 0.0 XMMMMMMMF% %%..... 6.8 2.0 0.0 18 19 8.3 0.0 0.0 XMMMMMMM%% %.... 6.0 2.0 0.0 19 20 7.7 0.0 0.0 XMMMMMM%%% .... 5.7 2.0 0.0 20 21 8.1 0.0 0.0 XMMMMMMF%% %.... 6.0 2.0 0.0 21 22 12.8 0.0 5.1 ASMMMMF FF%%%%... 8.1 0.0 4.0 22 23 20.2 0.0 9.1 ASSSM MMMMFFFFFF %%%... 12.3 9.5 5.7 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) 17-Sep-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000