SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 14 February, 2025 T-index: 90 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 52-62 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.8 5.1 3.2 BB%%.. 00 01 6.2 5.6 3.5 ABF%%.. 01 02 6.7 6.0 3.6 ABB%%.. 02 03 7.2 6.2 3.8 ABBF%%. 03 04 7.5 6.3 3.8 ABBF%%. . 04 05 7.6 6.3 3.8 ABBF%%. . 05 06 7.7 6.1 3.7 ABBF%%. . 06 07 7.5 5.9 3.6 ABFF%%. . 07 08 7.3 5.4 3.4 BBFF%%. . 08 09 7.0 4.8 3.0 ABFF%%.. 09 10 6.7 3.8 2.5 AFFF%%.. 10 11 6.4 0.8 0.0 FFFFFF%%. 11 12 6.0 0.8 0.0 FFFFF%%.. 12 13 5.7 0.8 0.0 FFFFF%%. 13 14 5.2 0.8 0.0 FFFFF%.. 14 15 5.1 0.8 0.0 FFFFF%. 15 16 5.0 0.8 0.0 FFFF%%. 16 17 4.8 0.8 0.0 FFFF%%. 17 18 4.5 0.8 0.0 FFFF%.. 18 19 4.3 0.8 0.0 FFFF%. 19 20 3.9 0.8 0.0 FFF%.. 20 21 3.8 0.8 0.0 FFF%.. 21 22 4.2 2.5 1.7 AFF%. 22 23 5.1 4.2 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-Feb-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000