SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Geraldton Perth Date: 22 October, 2024 T-index: 140 Bearings: 162 341 Distance: 373 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 53-64 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 8.9 5.3 3.4 BBFFF%% . 00 01 9.4 5.9 3.7 ABFFFF% .. 01 02 9.7 6.2 3.9 ABBFFF% %. 02 03 10.3 6.5 4.1 BBFFFF %.. 03 04 10.5 6.6 4.1 BBFFFF %%. 04 05 10.7 6.5 4.1 BBFFFF %%. 05 06 10.6 6.4 4.0 ABBFFFF %%. 06 07 10.2 6.1 3.9 ABBFFFF %.. 07 08 9.9 5.7 3.6 ABFFFF% %. 08 09 9.7 5.0 3.3 BBFFFF% %. 09 10 9.6 3.9 2.7 AFFFFFF% .. 10 11 9.1 0.9 0.0 FFFFFFFFF% . 11 12 8.5 0.9 0.0 FFFFFFFF%. 12 13 7.9 0.9 0.0 FFFFFFF%.. 13 14 7.2 0.9 0.0 FFFFFFF%.. 14 15 6.7 0.9 0.0 FFFFFF%%.. 15 16 6.3 0.9 0.0 FFFFFF%.. 16 17 6.1 0.9 0.0 FFFFFF%.. 17 18 5.8 0.9 0.0 FFFFF%%. 18 19 5.4 0.9 0.0 FFFFF%. 19 20 5.2 0.9 0.0 FFFFF%. 20 21 5.3 0.9 0.0 FFFFF%. 21 22 6.5 2.2 1.6 AFFFF%. 22 23 7.9 4.4 2.9 ABFFF%.. 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) 22-Oct-2024 BoM Space Weather Services, Sydney Australia +61-2-9213-8000