SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 7 September, 2026 T-index: 70 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 49-55 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.4 8.4 4.2 ASMMMMF% %.. 7.0 5.0 2.8 00 01 10.1 9.7 4.7 SXMMMMF %%.. 7.5 5.7 3.2 01 02 10.3 10.5 5.1 SSXMMMB %%.. 7.8 6.2 3.4 02 03 10.4 11.0 5.2 ASXMMMB P%.. 8.1 6.5 3.6 03 04 10.5 11.2 5.3 ASXMMMB P%... 8.2 6.6 3.6 04 05 10.5 11.2 5.3 ASXMMMB P%... 8.2 6.6 3.6 05 06 9.9 10.9 5.2 ASXMMMP %%.. 7.8 6.4 3.5 06 07 9.6 10.3 5.0 SXMMMMP %%.. 7.6 6.0 3.4 07 08 9.4 9.4 4.6 SXMMMM% %.. 7.4 5.5 3.1 08 09 9.1 7.9 4.0 AXMMMMF% %.. 7.1 4.6 2.7 09 10 8.2 4.1 2.3 AMMMMMM%% ... 6.4 2.0 1.7 10 11 6.8 1.5 0.0 MMMMMMM%%. .. 5.4 0.8 0.0 11 12 5.9 1.5 0.0 MMMMMM%%.. 4.7 0.8 0.0 12 13 5.4 1.5 0.0 MMMMM%%.. 4.4 0.8 0.0 13 14 5.1 1.5 0.0 MMMMM%.. 4.2 0.8 0.0 14 15 5.0 1.5 0.0 MMMMM%.. 4.1 0.8 0.0 15 16 4.8 1.5 0.0 MMMMM%.. 4.0 0.8 0.0 16 17 4.7 1.5 0.0 MMMMM%. 3.9 0.8 0.0 17 18 4.4 1.5 0.0 MMMM%.. 3.8 0.8 0.0 18 19 4.3 1.5 0.0 MMMM%.. 3.6 0.8 0.0 19 20 4.0 1.5 0.0 MMMM%. 3.5 0.8 0.0 20 21 3.8 1.5 0.0 MMMM%. 3.3 0.8 0.0 21 22 4.4 1.5 0.0 MMMM%.. 3.8 0.8 0.0 22 23 7.2 5.9 3.1 SMMMF%.. 5.6 3.4 2.1 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) 7-Sep-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000