SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 30 September, 2026 T-index: 65 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 9.0 8.9 4.4 ASXMMM%% %. 6.8 5.2 3.0 00 01 9.3 10.0 4.9 SXMMMBP %.. 7.1 5.9 3.3 01 02 9.6 10.8 5.1 ASXMMMP %.. 7.4 6.3 3.5 02 03 9.9 11.2 5.3 ASXMMMP P%.. 7.8 6.6 3.6 03 04 10.1 11.4 5.4 ASXMMMB P%.. 8.0 6.7 3.7 04 05 10.2 11.4 5.4 ASXMMMB P%.. 8.1 6.7 3.7 05 06 9.7 11.1 5.3 ASXMMMP P%.. 7.7 6.5 3.6 06 07 9.3 10.6 5.1 ASXMMMP %.. 7.4 6.2 3.5 07 08 9.1 9.7 4.7 SXMMMM% %.. 7.2 5.7 3.2 08 09 8.9 8.4 4.2 ASMMMM%% %.. 7.0 4.9 2.9 09 10 8.1 6.0 3.1 SMMMMM%% ... 6.4 3.4 2.2 10 11 7.0 1.4 0.0 MMMMMMM%%. .. 5.5 0.8 0.0 11 12 6.2 1.4 0.0 MMMMMM%%.. . 5.0 0.8 0.0 12 13 5.6 1.4 0.0 MMMMMM%... 4.6 0.8 0.0 13 14 5.4 1.4 0.0 MMMMMM%.. 4.4 0.8 0.0 14 15 5.4 1.4 0.0 MMMMM%%. 4.4 0.8 0.0 15 16 5.2 1.4 0.0 MMMMM%.. 4.3 0.8 0.0 16 17 5.0 1.4 0.0 MMMMM%.. 4.2 0.8 0.0 17 18 4.8 1.4 0.0 MMMMM%. 4.0 0.8 0.0 18 19 4.5 1.4 0.0 MMMM%.. 3.8 0.8 0.0 19 20 4.2 1.4 0.0 MMMM%. 3.6 0.8 0.0 20 21 4.2 1.4 0.0 MMMM%. 3.6 0.8 0.0 21 22 5.2 1.4 0.0 MMMMM%.. 4.4 0.8 0.0 22 23 7.6 6.9 3.6 SMMMM%%. . 5.9 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) 30-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000