On the interpretation of velocities derived from spaced fading records
A number of spaced fading records obtained at Buckland Park, South Australia, using partial reflection technique (at 80–100 km) have been subjected to different methods of analysis, viz., time delay methods, the full correlation method and the cross-spectrum method. True drift velocities derived from the full correlation method appear to be the most correct. The variation of velocity with fading frequency obtained from cross-spectrum method is most likely to be due to the variation of velocity with time within the record itself.
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