SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Carnarvon Perth Date: 6 March, 2026 T-index: 110 Bearings: 165 344 Distance: 815 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 30-39 1E 10 1 5 10 15 20 25 30 35 40 2F 50-59 2E 22 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 9.8 9.5 4.8 SXMMMM% %.. 7.6 5.6 3.3 00 01 10.6 10.6 5.3 ASXMMMB %%.. 8.2 6.3 3.6 01 02 11.1 11.4 5.6 ASXMMMM B%%.. 8.6 6.7 3.8 02 03 11.4 11.8 5.8 ASXMMMM B%%.. 9.0 7.0 3.9 03 04 11.6 12.0 5.9 ASXXMMM MP%... 9.3 7.1 4.0 04 05 11.8 12.0 5.9 ASXXMMM MP%%.. 9.4 7.1 4.0 05 06 11.8 11.7 5.7 ASXMMMM M%%%.. 9.4 6.9 3.9 06 07 11.5 11.2 5.5 ASXMMMM M%%%.. 9.2 6.6 3.8 07 08 11.2 10.3 5.2 ASXMMMM F%%.. 8.9 6.1 3.5 08 09 10.9 9.0 4.6 SXMMMMM %%%.. 8.6 5.3 3.1 09 10 10.3 6.6 3.6 SMMMMMMM %%.. 8.2 3.8 2.4 10 11 9.6 1.6 0.0 MMMMMMMMM% %... 7.6 0.9 0.0 11 12 8.6 1.6 0.0 MMMMMMMM%% .. 7.0 0.9 0.0 12 13 7.9 1.6 0.0 MMMMMMM%%. . 6.4 0.9 0.0 13 14 7.2 1.6 0.0 MMMMMMM%%. 5.9 0.9 0.0 14 15 6.8 1.6 0.0 MMMMMMM%.. 5.7 0.9 0.0 15 16 6.7 1.6 0.0 MMMMMM%%.. 5.5 0.9 0.0 16 17 6.5 1.6 0.0 MMMMMM%%.. 5.3 0.9 0.0 17 18 6.2 1.6 0.0 MMMMMM%.. 5.1 0.9 0.0 18 19 5.8 1.6 0.0 MMMMMM%. 4.8 0.9 0.0 19 20 5.2 1.6 0.0 MMMMM%.. 4.4 0.9 0.0 20 21 4.9 1.6 0.0 MMMMM%. 4.3 0.9 0.0 21 22 5.8 1.6 0.0 MMMMM%%. 4.9 0.9 0.0 22 23 8.1 7.5 4.0 AXMMMF%. . 6.4 4.4 2.7 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) 6-Mar-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000