SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Karratha Perth Date: 9 November, 2025 T-index: 105 Bearings: 184 5 Distance: 1251 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 19-29 1E 5 1 5 10 15 20 25 30 35 40 2F 37-50 2E 14 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 11.3 13.5 7.2 SSSXMB BPP%... 8.0 8.4 4.3 00 01 11.5 14.8 7.7 ASSXXM BPPP... 8.3 9.2 4.7 01 02 11.8 15.7 8.1 ASSSXM BPPPE.. 8.7 9.8 4.9 02 03 12.5 16.2 8.3 ASSSXX MBPPPE.. 9.2 10.1 5.0 03 04 13.0 16.4 8.4 SSSXX MBPPPP... 9.5 10.2 5.1 04 05 13.3 16.4 8.4 SSSXX MMBPPP... 9.7 10.2 5.1 05 06 13.2 16.0 8.2 ASSSXM MBBPPP... 9.5 10.0 5.0 06 07 12.5 15.3 7.9 ASSXXM MBPPP%.. 9.1 9.5 4.8 07 08 12.1 14.2 7.5 ASSXMM MBPP%... 8.8 8.9 4.5 08 09 12.2 12.5 6.7 SSXMMM MB%%%... 8.8 7.8 4.1 09 10 12.0 9.9 5.5 SSMMMMM M%%%%... 8.7 6.0 3.4 10 11 11.7 2.2 0.0 XMMMMMMMMM F%%%... 8.5 1.3 0.0 11 12 10.7 2.2 0.0 XMMMMMMMMF %%%... 7.9 1.3 0.0 12 13 9.8 2.2 0.0 XMMMMMMMM% %%.. 7.2 1.3 0.0 13 14 9.3 2.2 0.0 XMMMMMMMF% %... 6.8 1.3 0.0 14 15 9.1 2.2 0.0 XMMMMMMMF% %... 6.7 1.3 0.0 15 16 9.2 2.2 0.0 XMMMMMMMF% %... 6.6 1.3 0.0 16 17 8.6 2.2 0.0 XMMMMMMF%% ... 6.2 1.3 0.0 17 18 7.8 2.2 0.0 XMMMMMM%%% .. 5.8 1.3 0.0 18 19 7.2 2.2 0.0 XMMMMMF%%. . 5.4 1.3 0.0 19 20 6.9 2.2 0.0 XMMMMM%%.. . 5.2 1.3 0.0 20 21 7.2 2.2 0.0 XMMMMMF%%. . 5.5 1.3 0.0 21 22 9.0 7.5 4.4 ASMMMM%% %... 6.5 4.5 2.7 22 23 10.6 11.5 6.2 ASSXMMB P%%... 7.4 7.2 3.8 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) 9-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000