SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 9 January, 2026 T-index: 70 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 52-64 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.1 5.1 3.2 BB%.. 00 01 5.5 5.6 3.4 BB%%.. 01 02 6.1 5.9 3.6 ABF%.. 02 03 6.6 6.1 3.7 ABB%%.. 03 04 6.8 6.2 3.7 ABB%%.. 04 05 7.0 6.2 3.7 ABB%%.. 05 06 6.9 6.0 3.6 ABB%%.. 06 07 6.7 5.8 3.5 ABF%%.. 07 08 6.5 5.4 3.3 BBF%%.. 08 09 6.3 4.9 3.1 BFF%%. 09 10 5.9 4.1 2.6 ABF%%.. 10 11 5.7 2.5 1.7 AFFF%%.. 11 12 5.5 0.8 0.0 FFFFF%%. 12 13 5.3 0.8 0.0 FFFFF%%. 13 14 5.1 0.8 0.0 FFFFF%.. 14 15 5.0 0.8 0.0 FFFF%%.. 15 16 4.9 0.8 0.0 FFFF%%. 16 17 4.6 0.8 0.0 FFFF%%. 17 18 4.4 0.8 0.0 FFFF%.. 18 19 4.2 0.8 0.0 FFFF%. 19 20 3.9 0.8 0.0 FFF%.. 20 21 3.9 0.8 0.0 FFF%.. 21 22 4.3 3.3 2.2 BF%.. 22 23 4.8 4.4 2.8 AB%%. 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) 9-Jan-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000