SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 31 December, 2025 T-index: 120 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 39-54 1E 15 1 5 10 15 20 25 30 35 40 2F 59-70 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.0 8.5 4.3 AXMMP.. . 6.3 5.2 3.5 00 01 7.5 9.2 4.6 AXMMMP. . 6.7 5.6 3.7 01 02 7.8 9.6 4.8 AXMMMP. .. 7.1 5.9 3.8 02 03 8.1 9.9 4.9 AXMMMM% .. 7.4 6.0 3.9 03 04 8.3 10.0 4.9 AXXMMMP .. 7.6 6.1 4.0 04 05 8.4 9.9 4.9 AXXMMM% .. 7.6 6.1 3.9 05 06 8.2 9.7 4.8 AXMMMM% .. 7.4 5.9 3.9 06 07 8.0 9.3 4.6 AXMMMM% .. 7.2 5.6 3.7 07 08 7.8 8.6 4.4 AXMMM%. . 7.0 5.3 3.5 08 09 7.6 7.8 4.0 XMMMM%. . 6.8 4.7 3.2 09 10 7.6 6.4 3.4 AMMMMM%. . 6.8 3.8 2.8 10 11 7.6 3.4 2.0 AMMMMMM%. 6.8 0.0 1.8 11 12 7.4 1.3 0.0 MMMMMMMM%. 6.6 0.8 0.0 12 13 7.3 1.3 0.0 MMMMMMMM.. 6.6 0.8 0.0 13 14 7.0 1.3 0.0 MMMMMMM%.. 6.4 0.8 0.0 14 15 6.8 1.3 0.0 MMMMMMM%. 6.2 0.8 0.0 15 16 6.5 1.3 0.0 MMMMMMM%. 5.9 0.8 0.0 16 17 6.1 1.3 0.0 MMMMMM%. 5.5 0.8 0.0 17 18 5.6 1.3 0.0 MMMMMM%. 5.1 0.8 0.0 18 19 5.0 1.3 0.0 MMMMM%. 4.6 0.8 0.0 19 20 4.7 1.3 0.0 MMMMM%. 4.4 0.8 0.0 20 21 4.9 1.3 0.0 MMMMM%. 4.5 0.0 1.5 21 22 5.8 6.1 3.3 AMMM%.. 5.2 3.6 2.7 22 23 6.5 7.6 3.9 XMMM%.. 5.8 4.6 3.2 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) 31-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000