SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 28 September, 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 29-36 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 8.8 8.8 4.3 ASXMMM%% .. 6.6 5.2 2.9 00 01 9.2 9.9 4.8 SXMMMB% %.. 7.0 5.9 3.2 01 02 9.4 10.7 5.1 ASXMMBP %.. 7.3 6.3 3.5 02 03 9.7 11.1 5.3 ASXMMMP P.. 7.6 6.5 3.6 03 04 9.9 11.3 5.3 ASXMMMP P%.. 7.8 6.7 3.6 04 05 10.1 11.3 5.3 ASXMMMB P%.. 7.9 6.6 3.6 05 06 9.5 11.0 5.2 ASXMMMP P.. 7.6 6.5 3.6 06 07 9.1 10.5 5.0 SXXMMMP %.. 7.2 6.2 3.4 07 08 8.9 9.6 4.7 SXMMMP% %.. 7.0 5.6 3.2 08 09 8.7 8.3 4.1 ASMMMM%% %. 6.8 4.9 2.8 09 10 8.0 5.8 3.1 SMMMMM%% ... 6.3 3.3 2.1 10 11 6.9 1.4 0.0 MMMMMMM%%. .. 5.5 0.8 0.0 11 12 6.1 1.4 0.0 MMMMMM%%.. 4.9 0.8 0.0 12 13 5.5 1.4 0.0 MMMMMM%.. 4.5 0.8 0.0 13 14 5.3 1.4 0.0 MMMMM%%.. 4.3 0.8 0.0 14 15 5.3 1.4 0.0 MMMMM%.. 4.3 0.8 0.0 15 16 5.0 1.4 0.0 MMMMM%.. 4.1 0.8 0.0 16 17 4.9 1.4 0.0 MMMMM%.. 4.0 0.8 0.0 17 18 4.6 1.4 0.0 MMMMM%. 3.9 0.8 0.0 18 19 4.4 1.4 0.0 MMMM%.. 3.7 0.8 0.0 19 20 4.1 1.4 0.0 MMMM%. 3.5 0.8 0.0 20 21 4.0 1.4 0.0 MMMM%. 3.5 0.8 0.0 21 22 5.1 1.4 0.0 MMMMM%. 4.2 0.8 0.0 22 23 7.4 6.8 3.5 SMMMM%%. 5.7 4.0 2.4 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) 28-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000