SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 13 March, 2026 T-index: 100 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 29-38 1E 10 1 5 10 15 20 25 30 35 40 2F 50-58 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 10.0 9.2 4.7 SXMMMM% %.. 7.6 5.5 3.2 00 01 10.8 10.4 5.2 ASXMMMB %%.. 8.3 6.2 3.5 01 02 11.2 11.2 5.5 ASXMMMM B%%.. 8.7 6.6 3.7 02 03 11.6 11.7 5.7 ASXMMMM B%%.. 9.1 6.9 3.8 03 04 11.9 11.9 5.7 ASXMMMM M%%... 9.4 7.0 3.9 04 05 12.0 11.8 5.7 ASXMMMM M%%%.. 9.5 7.0 3.9 05 06 11.8 11.5 5.6 ASXMMMM M%%%.. 9.4 6.8 3.8 06 07 11.5 11.0 5.4 ASXMMMM M%%%.. 9.1 6.5 3.7 07 08 11.2 10.1 5.0 SXMMMMM F%%.. 8.8 5.9 3.4 08 09 11.0 8.8 4.5 ASXMMMMM %%%.. 8.6 5.1 3.0 09 10 10.1 6.2 3.3 SMMMMMMM %%.. 8.0 3.6 2.3 10 11 9.2 1.6 0.0 MMMMMMMMM% %... 7.3 0.9 0.0 11 12 8.2 1.6 0.0 MMMMMMMM%% .. 6.6 0.9 0.0 12 13 7.4 1.6 0.0 MMMMMMM%%. . 6.0 0.9 0.0 13 14 6.8 1.6 0.0 MMMMMMM%.. 5.6 0.9 0.0 14 15 6.5 1.6 0.0 MMMMMM%%.. 5.4 0.9 0.0 15 16 6.3 1.6 0.0 MMMMMM%%.. 5.2 0.9 0.0 16 17 6.1 1.6 0.0 MMMMMM%.. 5.0 0.9 0.0 17 18 5.9 1.6 0.0 MMMMMM%.. 4.9 0.9 0.0 18 19 5.6 1.6 0.0 MMMMM%%. 4.6 0.9 0.0 19 20 5.0 1.6 0.0 MMMMM%. 4.2 0.9 0.0 20 21 4.7 1.6 0.0 MMMMM%. 4.1 0.9 0.0 21 22 5.5 1.6 0.0 MMMMM%.. 4.7 0.9 0.0 22 23 8.1 7.2 3.8 AXMMMF%. . 6.3 4.2 2.6 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) 13-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000