SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 1 May, 2025 T-index: 115 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 29-35 1E 10 1 5 10 15 20 25 30 35 40 2F 49-55 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 12.0 8.1 4.2 ASMMMMMM F%%.. 9.0 4.8 2.8 00 01 13.7 9.7 4.9 SXMMMMM MFF%%.. 10.3 5.7 3.3 01 02 14.4 10.6 5.3 ASXMMMM MMFF%%.. 11.0 6.2 3.6 02 03 14.6 11.2 5.5 ASXMMMM MMFF%%.. 11.3 6.6 3.7 03 04 14.4 11.4 5.6 ASXMMMM MMFF%%.. 11.2 6.7 3.8 04 05 14.3 11.4 5.6 ASXMMMM MMFF%%.. 11.3 6.7 3.8 05 06 14.1 11.0 5.4 ASXMMMM MMFF%%.. 11.2 6.5 3.7 06 07 14.0 10.4 5.2 ASXMMMM MMF%%%.. 11.0 6.1 3.5 07 08 13.8 9.3 4.7 SXMMMMM MMF%%%.. 10.8 5.4 3.2 08 09 13.3 7.4 3.9 AXMMMMMM MFF%%.. 10.3 4.2 2.7 09 10 11.8 1.6 0.0 MMMMMMMMMM F%%... 9.0 1.0 0.0 10 11 9.7 1.6 0.0 MMMMMMMMF% %.. 7.5 1.0 0.0 11 12 8.1 1.6 0.0 MMMMMMMF%. . 6.4 1.0 0.0 12 13 7.1 1.6 0.0 MMMMMMF%.. 5.7 1.0 0.0 13 14 6.4 1.6 0.0 MMMMMM%.. 5.3 1.0 0.0 14 15 5.9 1.6 0.0 MMMMMM%.. 5.0 1.0 0.0 15 16 5.7 1.6 0.0 MMMMM%%.. 4.8 1.0 0.0 16 17 5.5 1.6 0.0 MMMMM%.. 4.7 1.0 0.0 17 18 5.2 1.6 0.0 MMMMM%.. 4.4 1.0 0.0 18 19 5.0 1.6 0.0 MMMMM%.. 4.3 1.0 0.0 19 20 4.8 1.6 0.0 MMMMM%. 4.1 1.0 0.0 20 21 4.4 1.6 0.0 MMMM%.. 3.8 1.0 0.0 21 22 4.8 1.6 0.0 MMMMM.. 4.1 1.0 0.0 22 23 8.2 3.8 2.2 AMMMMMF%. 6.4 2.2 1.5 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