SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 23 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 29-35 1E 10 1 5 10 15 20 25 30 35 40 2F 49-56 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.5 8.6 4.2 ASXMMB%% .. 6.3 5.1 2.8 00 01 8.9 9.7 4.7 SXMMMP% ... 6.7 5.7 3.2 01 02 9.0 10.5 5.0 SXXMMPP %.. 6.9 6.2 3.4 02 03 9.2 10.9 5.1 ASXMMBP %.. 7.2 6.4 3.5 03 04 9.5 11.1 5.2 ASXMMMP P.. 7.4 6.5 3.6 04 05 9.6 11.1 5.2 ASXMMMP P.. 7.5 6.5 3.5 05 06 9.1 10.8 5.1 ASXMMMP %.. 7.2 6.4 3.5 06 07 8.9 10.3 4.9 SXMMMPP %.. 7.0 6.0 3.3 07 08 8.6 9.4 4.6 SXMMMP% .. 6.8 5.5 3.1 08 09 8.4 8.1 4.0 AXMMMM%% .. 6.5 4.7 2.7 09 10 7.6 5.4 2.9 AXMMMM%%% .. 5.9 3.1 2.0 10 11 6.5 1.4 0.0 MMMMMMM%%. . 5.1 0.8 0.0 11 12 5.7 1.4 0.0 MMMMMM%... 4.5 0.8 0.0 12 13 5.1 1.4 0.0 MMMMM%%.. 4.2 0.8 0.0 13 14 4.9 1.4 0.0 MMMMM%.. 4.1 0.8 0.0 14 15 4.9 1.4 0.0 MMMMM%.. 4.1 0.8 0.0 15 16 4.8 1.4 0.0 MMMMM%. 3.9 0.8 0.0 16 17 4.6 1.4 0.0 MMMM%%. 3.9 0.8 0.0 17 18 4.4 1.4 0.0 MMMM%.. 3.7 0.8 0.0 18 19 4.2 1.4 0.0 MMMM%.. 3.6 0.8 0.0 19 20 3.9 1.4 0.0 MMMM%. 3.4 0.8 0.0 20 21 3.9 1.4 0.0 MMMM%. 3.3 0.8 0.0 21 22 4.8 1.4 0.0 MMMMM%. 4.0 0.8 0.0 22 23 7.0 6.5 3.3 SMMM%%.. 5.4 3.8 2.3 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) 23-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000