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The purpose of this paper is to review the previous direction finding (DF) systems including goniometer, field-analysis method and also we demonstrate how important these DF techniques are in the general studies of VLF/ELF sferics and whistlers. We have presented some latest findings such as new results on ELF transients (charge moment change) and convincing evidence on the ducted propagation of low-latitude whistlers.

The Importance of Direction Finding Technique for the Study of VLF/ELF Sferics and Whistlers