SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 15 May, 2025 T-index: 80 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 49-53 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 10.0 7.4 3.8 AXMMMMF% %.. 7.4 4.3 2.6 00 01 11.8 9.1 4.5 ASXMMMMM F%%... 8.6 5.3 3.0 01 02 12.4 10.0 4.8 SXMMMMM FF%%... 9.2 5.9 3.3 02 03 12.6 10.6 5.1 ASXMMMM MF%%... 9.5 6.2 3.5 03 04 12.3 10.8 5.2 ASXMMMM FF%%.. 9.3 6.4 3.5 04 05 11.9 10.8 5.1 ASXMMMM F%%... 9.2 6.3 3.5 05 06 11.9 10.5 5.0 SXXMMMM F%%%.. 9.3 6.1 3.4 06 07 12.1 9.8 4.8 SXMMMMM MF%%.. 9.4 5.7 3.3 07 08 12.1 8.7 4.3 ASMMMMMM FF%%.. 9.2 5.0 3.0 08 09 11.4 6.6 3.4 SMMMMMMM F%%.. 8.5 3.7 2.4 09 10 9.2 1.5 0.0 MMMMMMMMF% %... 7.0 0.9 0.0 10 11 7.1 1.5 0.0 MMMMMMF%%. .. 5.5 0.9 0.0 11 12 5.7 1.5 0.0 MMMMM%%.. 4.5 0.9 0.0 12 13 5.1 1.5 0.0 MMMMM%.. 4.1 0.9 0.0 13 14 4.8 1.5 0.0 MMMMM%.. 4.0 0.9 0.0 14 15 4.6 1.5 0.0 MMMM%.. 3.9 0.9 0.0 15 16 4.6 1.5 0.0 MMMM%.. 3.9 0.9 0.0 16 17 4.5 1.5 0.0 MMMM%.. 3.9 0.9 0.0 17 18 4.3 1.5 0.0 MMMM%.. 3.7 0.9 0.0 18 19 4.2 1.5 0.0 MMMM%.. 3.6 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 4.0 1.5 0.0 MMMM%. 3.5 0.9 0.0 22 23 6.8 1.5 0.0 MMMMMM%%. 5.3 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) 15-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000