SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 12 July, 2026 T-index: 47 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 28-32 1E 10 1 5 10 15 20 25 30 35 40 2F 48-53 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.9 6.8 3.4 SMMMF%%. 5.9 4.0 2.3 00 01 9.2 8.5 4.1 ASMMMBF% .. 6.7 5.0 2.8 01 02 9.4 9.5 4.5 SXMMMB% %.. 6.9 5.6 3.1 02 03 9.3 10.0 4.7 SXMMMBP %.. 6.9 5.9 3.2 03 04 9.1 10.2 4.8 SXMMMBP %.. 6.9 6.0 3.3 04 05 9.0 10.2 4.8 SXMMMPP .. 6.9 6.0 3.3 05 06 9.0 9.9 4.6 SXMMMP% .. 6.9 5.8 3.2 06 07 9.1 9.2 4.4 ASXMMMB% .. 7.0 5.4 3.0 07 08 9.1 8.1 3.9 AXMMMMF% .. 6.9 4.7 2.7 08 09 8.8 5.9 3.0 XMMMMF%% .. 6.6 3.3 2.1 09 10 6.6 1.4 0.0 MMMMMM%%.. 5.0 0.8 0.0 10 11 4.9 1.4 0.0 MMMM%%.. 3.9 0.8 0.0 11 12 4.1 1.4 0.0 MMMM%.. 3.4 0.8 0.0 12 13 3.9 1.4 0.0 MMMM%. 3.3 0.8 0.0 13 14 3.9 1.4 0.0 MMMM.. 3.3 0.8 0.0 14 15 3.9 1.4 0.0 MMMM.. 3.3 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.. 3.2 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 3.5 1.4 0.0 MMM%.. 2.9 0.8 0.0 21 22 3.6 1.4 0.0 MMM%. 3.0 0.8 0.0 22 23 5.3 1.4 0.0 MMMMF%. 4.2 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) 12-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000