SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 14 November, 2025 T-index: 60 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 52-63 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.5 5.0 3.1 BB%%. 00 01 5.8 5.5 3.3 BB%%.. 01 02 6.4 5.8 3.5 ABF%%.. 02 03 6.9 6.0 3.6 ABB%%.. 03 04 7.2 6.1 3.6 ABBF%%. . 04 05 7.4 6.1 3.6 ABBF%%. . 05 06 7.2 5.9 3.6 ABFF%%. . 06 07 7.1 5.7 3.4 BBFF%%. 07 08 6.9 5.3 3.2 BBF%%.. 08 09 6.8 4.8 3.0 ABFF%%.. 09 10 6.5 3.9 2.5 AFFF%%.. 10 11 6.2 1.5 1.1 FFFFF%%. 11 12 5.7 0.7 0.0 FFFFF%%.. 12 13 5.1 0.7 0.0 FFFFF%.. 13 14 4.9 0.7 0.0 FFFF%%. 14 15 4.8 0.7 0.0 FFFF%%. 15 16 4.8 0.7 0.0 FFFF%%. 16 17 4.5 0.7 0.0 FFFF%.. 17 18 4.3 0.7 0.0 FFFF%. 18 19 4.1 0.7 0.0 FFFF%. 19 20 3.9 0.7 0.0 FFF%.. 20 21 4.1 0.7 0.0 FFFF.. 21 22 4.7 2.9 2.0 AFF%.. 22 23 5.1 4.3 2.7 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) 14-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000