SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 22 July, 2026 T-index: 50 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 28-33 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 8.1 7.0 3.5 SXMMBF%. . 6.0 4.1 2.4 00 01 9.3 8.7 4.2 ASXMMBF% .. 6.8 5.1 2.8 01 02 9.6 9.6 4.6 SXMMMB% %.. 7.1 5.6 3.1 02 03 9.6 10.1 4.8 SXMMMBP %.. 7.1 5.9 3.2 03 04 9.4 10.4 4.9 SXXMMBP %.. 7.1 6.1 3.3 04 05 9.2 10.3 4.8 SXXMMBP %.. 7.1 6.1 3.3 05 06 9.1 10.0 4.7 SXMMMBP .. 7.1 5.9 3.2 06 07 9.2 9.4 4.5 SXMMMB% .. 7.1 5.5 3.1 07 08 9.1 8.3 4.0 AXMMMMF% .. 7.0 4.8 2.8 08 09 8.8 6.2 3.2 SMMMMF%% .. 6.6 3.5 2.2 09 10 6.8 1.4 0.0 MMMMMM%%.. 5.2 0.8 0.0 10 11 5.2 1.4 0.0 MMMMM%... 4.1 0.8 0.0 11 12 4.3 1.4 0.0 MMMM%.. 3.5 0.8 0.0 12 13 4.0 1.4 0.0 MMMM%.. 3.4 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.. 3.0 0.8 0.0 20 21 3.4 1.4 0.0 MMM%.. 2.9 0.8 0.0 21 22 3.5 1.4 0.0 MMM%. 3.0 0.8 0.0 22 23 5.5 1.4 0.0 MMMMM%. 4.3 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) 22-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000