MULTI-CHANNEL EQUIPMENT FOR RECORDING VLF-EMISSIONS IN THE FREQUENCY-RANGE 2-16KC/S.
NORWEGIAN INST OF COSMIC PHYSICS OSLO
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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 kcs are presented, using five-channel equipment with center frequencies at 14.7, 12.3, 7.2, 4.7 and 2.3 kcs. 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 kcs the densities were of the order 10 x 10 to the minus 16th power wsq m c. On 15 kcs the density had increased to 60-70 x 10 to the minus 16th power wsq 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 kcs. Author