SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 19 March, 2025 T-index: 150 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 13-19 1E 2 1 5 10 15 20 25 30 35 40 2F 29-38 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 21.3 15.5 9.5 ASSSX MMMMBFFFFF F%%.. 13.3 10.2 5.6 00 01 23.7 17.3 10.3 SSSS XMMMMMBFFF FFF%%... 14.5 11.4 6.1 01 02 24.4 18.4 10.9 SSSS XXMMMMBBFF FFFF%%.. 14.7 12.1 6.4 02 03 24.8 19.0 11.2 ASSS SXMMMMBBBF FFFF%%.. 14.9 12.6 6.5 03 04 24.8 19.2 11.3 ASSS SXMMMMBBBF FFFF%%.. 15.0 12.8 6.6 04 05 24.9 19.0 11.2 ASSS SXMMMMBBBF FFFF%%.. 15.0 12.7 6.5 05 06 25.0 18.5 10.9 SSSS XXMMMMBBFF FFFF%%.. 15.2 12.3 6.3 06 07 24.6 17.4 10.4 ASSSS XMMMMMBFFF FFFF%... 15.3 11.7 6.0 07 08 24.7 15.7 9.6 ASSSX MMMMMMFFFF FFFF%... 15.0 10.5 5.6 08 09 24.1 13.0 8.2 ASSSMM MMMMMMFFFF FFFF%... 14.7 8.6 4.8 09 10 22.1 5.8 4.2 ASMMMMMM MMMMMFFFFF FF%... 13.8 0.0 3.0 10 11 20.5 2.7 0.0 XMMMMMMMMM MMMMFFFFFF %%.. 13.1 1.8 0.0 11 12 17.6 2.7 0.0 XMMMMMMMMM MMFFFFF%.. . 11.6 1.8 0.0 12 13 16.6 2.7 0.0 XMMMMMMMMM MFFFFF%... 10.6 1.8 0.0 13 14 14.1 2.7 0.0 XMMMMMMMMM FFFF%%... 9.4 1.8 0.0 14 15 13.1 2.7 0.0 XMMMMMMMMM FFF%%..... 8.5 1.8 0.0 15 16 12.7 2.7 0.0 XMMMMMMMMF FF%%%..... 8.2 1.8 0.0 16 17 12.7 2.7 0.0 XMMMMMMMMF FF%%%..... 7.9 1.8 0.0 17 18 11.2 2.7 0.0 XMMMMMMMMF F%%%.... 7.7 1.8 0.0 18 19 10.3 2.7 0.0 XMMMMMMMFF %%%..... 7.5 1.8 0.0 19 20 9.0 2.7 0.0 XMMMMMMF%% %.... 6.5 1.8 0.0 20 21 8.4 2.7 0.0 XMMMMMMF%% .... 6.2 1.8 0.0 21 22 11.7 2.7 0.0 MMMMMMMMFF F%%.... 7.6 0.0 2.4 22 23 19.0 12.7 8.0 ASSXMM MMFFFFFF%% .. 11.1 8.1 4.8 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) 19-Mar-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000