SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Esperance Perth Date: 8 December, 2025 T-index: 130 Bearings: 289 112 Distance: 602 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 39-55 1E 15 1 5 10 15 20 25 30 35 40 2F 59-71 2E 30 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 7.5 8.6 4.4 AXMMM%. . 6.8 5.2 3.6 00 01 8.0 9.3 4.7 AXMMMP. .. 7.3 5.6 3.8 01 02 8.3 9.7 4.9 AXMMMM% .. 7.5 5.9 3.9 02 03 8.5 10.0 5.0 AXXMMMP .. 7.7 6.1 4.0 03 04 8.7 10.1 5.0 AXXMMMP ... 7.9 6.2 4.0 04 05 8.7 10.0 5.0 AXXMMMP ... 7.9 6.1 4.0 05 06 8.5 9.8 4.9 AXMMMM% .. 7.7 6.0 3.9 06 07 8.3 9.3 4.7 AXMMMM% .. 7.5 5.7 3.8 07 08 8.3 8.7 4.4 AXMMMM% .. 7.4 5.3 3.6 08 09 8.1 7.8 4.1 SMMMMM% .. 7.3 4.7 3.3 09 10 8.3 6.4 3.5 AMMMMMM% .. 7.4 3.8 2.8 10 11 8.4 3.3 2.0 AMMMMMM%. . 7.5 0.0 1.8 11 12 7.9 1.4 0.0 MMMMMMMM%. . 7.1 0.8 0.0 12 13 7.6 1.4 0.0 MMMMMMMM%. 6.9 0.8 0.0 13 14 7.2 1.4 0.0 MMMMMMMM.. 6.6 0.8 0.0 14 15 6.9 1.4 0.0 MMMMMMM%.. 6.4 0.8 0.0 15 16 6.7 1.4 0.0 MMMMMMM%. 6.1 0.8 0.0 16 17 6.2 1.4 0.0 MMMMMMM.. 5.7 0.8 0.0 17 18 5.8 1.4 0.0 MMMMMM%. 5.3 0.8 0.0 18 19 5.1 1.4 0.0 MMMMMM. 4.7 0.8 0.0 19 20 4.9 1.4 0.0 MMMMMM. 4.6 0.8 0.0 20 21 5.1 1.4 0.0 MMMMMM.. 4.7 0.0 1.4 21 22 6.3 6.2 3.3 AMMMM%. 5.7 3.6 2.7 22 23 7.0 7.6 4.0 XMMM%.. 6.4 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) 8-Dec-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000