Spectrum Analysis of VLF Emissions

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Department of Electrical Engineering, Stanford University., 1968 - Electric waves - 47 pages
Amplitude analysis of discrete VLF emissions using the Rayspan spectrum analyzer showed characteristics that are not readily detected using the conventional 'frequency' spectrograms. From a small sampling of discrete VLF emissions recorded at various ground stations, the following observations were made: Rise and fall times may be as small as 15 - 20 msec; Emissions that appear 'single' on a frequency spectrogram may consist of closely-linked shorter emissions, each having a duration of the order of 100 msec; Frequency modulation, previously suspected in some frequency spectrograms, is confirmed. In the samples studied the frequency of modulation ranged from 35 Hz to 70 Hz, while the frequency deviation lay mainly in the range 25 Hz to 50 Hz. (Author).

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Contents

INTRODUCTION
1
SPECTRUM ANALYSIS USING THE RAYSPAN INTENSITY SPECTRUM
7
B The Amplitude Analysis of VLF Emissions
18

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