SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 16 September, 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 29-34 1E 10 1 5 10 15 20 25 30 35 40 2F 49-55 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.6 8.4 4.1 ASMMMB%% .. 6.4 5.0 2.8 00 01 9.2 9.6 4.6 SXMMMB% %.. 6.8 5.7 3.1 01 02 9.2 10.4 4.9 SXXMMBP %.. 7.0 6.1 3.3 02 03 9.3 10.8 5.1 ASXMMBP %.. 7.2 6.4 3.5 03 04 9.5 11.0 5.2 ASXMMMP P.. 7.4 6.5 3.5 04 05 9.6 11.0 5.2 ASXMMMP P.. 7.5 6.5 3.5 05 06 9.1 10.7 5.1 SSXMMBP %.. 7.1 6.3 3.4 06 07 8.9 10.2 4.8 SXMMMPP %.. 6.9 6.0 3.3 07 08 8.7 9.3 4.5 SXMMMP% .. 6.8 5.4 3.1 08 09 8.3 7.9 3.9 AXMMMM%% .. 6.5 4.6 2.7 09 10 7.5 4.9 2.6 AMMMMM%%. .. 5.8 2.7 1.8 10 11 6.2 1.4 0.0 MMMMMM%%.. . 4.9 0.8 0.0 11 12 5.4 1.4 0.0 MMMMMM%.. 4.4 0.8 0.0 12 13 5.0 1.4 0.0 MMMMM%... 4.1 0.8 0.0 13 14 4.8 1.4 0.0 MMMMM%.. 3.9 0.8 0.0 14 15 4.8 1.4 0.0 MMMMM%. 3.9 0.8 0.0 15 16 4.6 1.4 0.0 MMMM%%. 3.8 0.8 0.0 16 17 4.5 1.4 0.0 MMMM%.. 3.8 0.8 0.0 17 18 4.3 1.4 0.0 MMMM%.. 3.7 0.8 0.0 18 19 4.2 1.4 0.0 MMMM%. 3.5 0.8 0.0 19 20 3.9 1.4 0.0 MMMM%. 3.4 0.8 0.0 20 21 3.7 1.4 0.0 MMMM.. 3.2 0.8 0.0 21 22 4.4 1.4 0.0 MMMM%. 3.7 0.8 0.0 22 23 6.8 6.2 3.2 SMMM%%.. 5.3 3.6 2.2 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-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000