SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 2 January, 2026 T-index: 110 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 53-65 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.2 5.4 3.4 BBF%.. 00 01 6.7 5.8 3.7 ABF%%.. 01 02 7.1 6.2 3.8 ABBF%.. . 02 03 7.4 6.4 3.9 ABBF%%. . 03 04 7.7 6.5 4.0 ABBF%%. . 04 05 7.8 6.4 4.0 ABBF%%. . 05 06 7.7 6.3 3.9 ABBF%%. . 06 07 7.4 6.1 3.8 ABBF%%. . 07 08 7.2 5.7 3.6 ABFF%%. . 08 09 7.0 5.1 3.3 BBF%%.. 09 10 6.8 4.3 2.8 ABFF%%.. 10 11 6.7 2.7 1.9 AFFFF%%. 11 12 6.6 0.8 0.0 FFFFFF%%. 12 13 6.5 0.8 0.0 FFFFFF%%. 13 14 6.2 0.8 0.0 FFFFFF%.. 14 15 6.1 0.8 0.0 FFFFFF%.. 15 16 5.9 0.8 0.0 FFFFF%%. 16 17 5.6 0.8 0.0 FFFFF%.. 17 18 5.1 0.8 0.0 FFFFF%. 18 19 4.7 0.8 0.0 FFFF%%. 19 20 4.4 0.8 0.0 FFFF%. 20 21 4.4 0.8 0.0 FFFF%. 21 22 5.0 3.5 2.4 BF%%. 22 23 5.7 4.7 3.0 ABF%%.. 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) 2-Jan-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000