SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Kalgoorlie Perth Date: 10 June, 2026 T-index: 75 Bearings: 254 77 Distance: 548 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 40-43 1E 17 1 5 10 15 20 25 30 35 40 2F 60-62 2E 32 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.7 5.4 2.8 MMMMM%%. 6.3 3.0 2.3 00 01 8.7 6.6 3.3 AMMMMM%% .. 7.3 3.8 2.7 01 02 9.3 7.3 3.6 AXMMMMM% .. 7.8 4.2 3.0 02 03 9.3 7.7 3.7 XMMMMM% %.. 7.9 4.4 3.1 03 04 9.2 7.8 3.8 XMMMMM% ... 7.9 4.5 3.1 04 05 9.2 7.7 3.7 XMMMMM% ... 7.9 4.5 3.1 05 06 9.4 7.4 3.6 AXMMMMM% %.. 8.0 4.3 3.0 06 07 9.4 6.8 3.4 AMMMMMM% %.. 8.1 3.9 2.8 07 08 9.2 5.7 2.9 XMMMMMM% .. 7.8 3.2 2.4 08 09 8.2 2.7 1.6 AMMMMMM%. . 6.9 0.0 1.5 09 10 6.1 1.1 0.0 MMMMMM%.. 5.2 0.6 0.0 10 11 4.5 1.1 0.0 MMMMM.. 4.0 0.6 0.0 11 12 3.9 1.1 0.0 MMMM%. 3.6 0.6 0.0 12 13 3.7 1.1 0.0 MMMM.. 3.4 0.6 0.0 13 14 3.6 1.1 0.0 MMMM.. 3.3 0.6 0.0 14 15 3.5 1.1 0.0 MMMM.. 3.3 0.6 0.0 15 16 3.5 1.1 0.0 MMMM.. 3.3 0.6 0.0 16 17 3.6 1.1 0.0 MMMM.. 3.3 0.6 0.0 17 18 3.6 1.1 0.0 MMMM.. 3.4 0.6 0.0 18 19 3.6 1.1 0.0 MMMM.. 3.4 0.6 0.0 19 20 3.7 1.1 0.0 MMMM.. 3.4 0.6 0.0 20 21 3.4 1.1 0.0 MMMM.. 3.2 0.6 0.0 21 22 3.4 1.1 0.0 MMM%. 3.1 0.6 0.0 22 23 5.3 1.1 0.0 MMMMM%. 4.5 0.0 0.9 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) 10-Jun-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000