MULTI-CHANNEL EQUIPMENT FOR RECORDING VLF-EMISSIONS IN THE FREQUENCY-RANGE 2-16KC/S.

The preliminary results of recordings of VLF-emissions at Tromso (phi = 69 deg 40 min N, lambda = 18 deg 57 min E Gr) in the frequency range 2 - 16 kc/s are presented, using five-channel equipment with center frequencies at 14.7, 12.3, 7.2, 4.7 and 2.3 kc/s. The power spectral densities of typical b...

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Bibliographic Details
Main Authors: Harang,L., Larsen,R., Skogtvedt,J.
Other Authors: NORWEGIAN INST OF COSMIC PHYSICS OSLO
Format: Text
Language:English
Published: 1965
Subjects:
(*ATMOSPHERICS
ELECTRONIC RECORDING SYSTEMS)
VERY LOW FREQUENCY
RADIO WAVES
RADIO RECEPTION
RADIO EQUIPMENT
GEOPHYSICS
MAGNETIC STORMS
METEOROLOGICAL PHENOMENA
NORWAY
Lambda
Norway
Tromso
Online Access:http://www.dtic.mil/docs/citations/AD0620870
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0620870
Description
Summary:The preliminary results of recordings of VLF-emissions at Tromso (phi = 69 deg 40 min N, lambda = 18 deg 57 min E Gr) in the frequency range 2 - 16 kc/s are presented, using five-channel equipment with center frequencies at 14.7, 12.3, 7.2, 4.7 and 2.3 kc/s. The power spectral densities of typical burst events were measured at each of the five center frequencies. At the lowest frequency no amplitude, or very faint amplitudes appeared. In the band 4 - 7 kc/s the densities were of the order 10 x 10 to the minus 16th power w/sq m c. On 15 kc/s the density had increased to 60-70 x 10 to the minus 16th power w/sq m c, there is thus an increase of 3-5 times. The center frequency of the emissions therefore lies at a higher frequency than 15-20 kc/s. (Author)

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