SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 1 May, 2025 T-index: 115 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-16 1E 2 1 5 10 15 20 25 30 35 40 2F 28-34 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 20.9 13.7 8.2 ASSSMM MMMMFFFFFF %%%... 13.0 8.7 4.9 00 01 23.5 15.7 9.2 SSSSX MMMMMMFFFF FFF%%%.... 14.4 10.2 5.4 01 02 24.0 16.9 9.8 ASSSX XMMMMMMFFF FFF%%%%... 14.9 11.1 5.8 02 03 23.9 17.6 10.1 ASSSS XMMMMMMFFF FFF%%%.... 15.0 11.6 5.9 03 04 23.7 17.8 10.2 ASSSS XMMMMMBFFF FFF%%%.... 14.8 11.8 6.0 04 05 23.2 17.6 10.1 ASSSS XMMMMMBFFF FFF%%%... 14.7 11.7 5.9 05 06 22.6 17.0 9.8 ASSSX XMMMMMBFFF FF%%%.... 14.5 11.3 5.7 06 07 23.0 15.8 9.3 SSSSX MMMMMMFFFF FF%%%%.... 14.4 10.5 5.4 07 08 22.5 13.9 8.3 ASSSXM MMMMMMFFFF FF%%%.... 14.1 9.3 4.8 08 09 21.9 10.4 6.5 ASSMMMM MMMMMFFFFF F%%%.... 13.6 6.9 3.8 09 10 18.4 2.5 0.0 XMMMMMMMMM MMMFFFFF%% %..... 11.8 1.7 0.0 10 11 14.8 2.5 0.0 XMMMMMMMMM MFFF%%%%.. ... 9.8 1.7 0.0 11 12 12.8 2.5 0.0 XMMMMMMMMM FF%%%.... 8.5 1.7 0.0 12 13 11.0 2.5 0.0 XMMMMMMMFF %%%.... 7.4 1.7 0.0 13 14 10.0 2.5 0.0 XMMMMMMMF% %%.... 6.8 1.7 0.0 14 15 9.0 2.5 0.0 XMMMMMMF%% %.... 6.3 1.7 0.0 15 16 8.9 2.5 0.0 XMMMMMMF%% %.... 6.1 1.7 0.0 16 17 8.4 2.5 0.0 XMMMMMMF%% .... 6.0 1.7 0.0 17 18 7.9 2.5 0.0 XMMMMMM%%% .... 5.7 1.7 0.0 18 19 7.3 2.5 0.0 XMMMMMF%%% .... 5.1 1.7 0.0 19 20 6.8 2.5 0.0 XMMMMM%%%. ... 4.7 1.7 0.0 20 21 6.2 2.5 0.0 XMMMMM%%.. .. 4.6 1.7 0.0 21 22 8.0 2.5 0.0 XMMMMMF%%% .. 5.6 1.7 0.0 22 23 16.5 9.8 6.2 ASSMMMM MFFFFF%%.. . 9.7 5.6 3.9 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) 1-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000