Very low frequency (VLF) radio phenomena (on the ground or in space) has been an interesting field of research. This area has rapidly gained importance in the diagnostic study of navigation, frequency, time standards and observations of naturally occurring VLF waves as a remote sensing technique for the earth's upper atmosphere. The VLF technique also has the ability to measure very low electron density, which cannot be sensed by satellite. The present monograph, which is one step towards achieving above mentioned goals, covers the most important topic of the generation and
