SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 19 July, 2026 T-index: 60 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 8.2 7.0 3.5 SXMMMF%. . 6.1 4.1 2.4 00 01 9.5 8.7 4.2 ASXMMMF% %.. 7.0 5.1 2.9 01 02 9.9 9.7 4.6 SXMMMB% %... 7.3 5.7 3.2 02 03 10.0 10.2 4.8 SXMMMBP %... 7.4 6.0 3.3 03 04 9.7 10.5 4.9 SXXMMBP %.. 7.4 6.1 3.4 04 05 9.5 10.4 4.9 SXXMMBP %.. 7.4 6.1 3.4 05 06 9.4 10.1 4.8 SXMMMBP %.. 7.3 5.9 3.3 06 07 9.5 9.5 4.5 SXMMMB% %.. 7.4 5.5 3.1 07 08 9.5 8.3 4.1 ASMMMMF% %.. 7.2 4.8 2.8 08 09 9.2 6.2 3.2 SMMMMMF% .. 6.9 3.4 2.2 09 10 7.1 1.4 0.0 MMMMMMF%.. . 5.4 0.8 0.0 10 11 5.5 1.4 0.0 MMMMM%%.. 4.3 0.8 0.0 11 12 4.5 1.4 0.0 MMMM%.. 3.7 0.8 0.0 12 13 4.1 1.4 0.0 MMMM%.. 3.5 0.8 0.0 13 14 4.0 1.4 0.0 MMMM%.. 3.4 0.8 0.0 14 15 4.0 1.4 0.0 MMMM%. 3.4 0.8 0.0 15 16 4.0 1.4 0.0 MMMM%. 3.4 0.8 0.0 16 17 3.9 1.4 0.0 MMMM%. 3.4 0.8 0.0 17 18 3.8 1.4 0.0 MMMM%. 3.3 0.8 0.0 18 19 3.7 1.4 0.0 MMMM%. 3.1 0.8 0.0 19 20 3.6 1.4 0.0 MMMM.. 3.1 0.8 0.0 20 21 3.5 1.4 0.0 MMM%.. 3.0 0.8 0.0 21 22 3.6 1.4 0.0 MMM%. 3.1 0.8 0.0 22 23 5.5 1.4 0.0 MMMMM%. 4.4 0.8 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) 19-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000