SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 16 May, 2025 T-index: 90 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 29-33 1E 10 1 5 10 15 20 25 30 35 40 2F 49-54 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 10.5 7.5 3.8 AXMMMMMF %%.. 7.8 4.4 2.6 00 01 12.4 9.2 4.5 SXMMMMM FF%%.. 9.1 5.4 3.1 01 02 13.0 10.2 4.9 SXMMMMM MF%%%.. 9.7 6.0 3.4 02 03 13.2 10.7 5.2 ASXMMMM MFF%%.. 10.0 6.3 3.5 03 04 12.8 10.9 5.3 ASXMMMM MF%%... 9.8 6.4 3.6 04 05 12.5 10.9 5.2 ASXMMMM MF%%.. 9.7 6.4 3.6 05 06 12.5 10.6 5.1 ASXMMMM MF%%.. 9.8 6.2 3.5 06 07 12.6 9.9 4.8 SXMMMMM MF%%... 9.8 5.8 3.3 07 08 12.7 8.8 4.4 ASXMMMMM MF%%... 9.6 5.1 3.0 08 09 12.0 6.7 3.5 SMMMMMMM F%%%.. 9.0 3.8 2.4 09 10 9.8 1.5 0.0 MMMMMMMMF% %... 7.4 0.9 0.0 10 11 7.6 1.5 0.0 MMMMMMM%%. .. 5.9 0.9 0.0 11 12 6.1 1.5 0.0 MMMMMM%.. 4.9 0.9 0.0 12 13 5.4 1.5 0.0 MMMMM%.. 4.3 0.9 0.0 13 14 5.0 1.5 0.0 MMMMM%.. 4.2 0.9 0.0 14 15 4.8 1.5 0.0 MMMMM%.. 4.1 0.9 0.0 15 16 4.8 1.5 0.0 MMMMM%. 4.0 0.9 0.0 16 17 4.7 1.5 0.0 MMMMM.. 4.0 0.9 0.0 17 18 4.4 1.5 0.0 MMMM%.. 3.8 0.9 0.0 18 19 4.3 1.5 0.0 MMMM%.. 3.7 0.9 0.0 19 20 4.2 1.5 0.0 MMMM%.. 3.6 0.9 0.0 20 21 3.9 1.5 0.0 MMMM%.. 3.4 0.9 0.0 21 22 4.2 1.5 0.0 MMMM%. 3.6 0.9 0.0 22 23 7.1 1.5 0.0 MMMMMMF%. 5.5 0.9 0.0 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) 16-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000