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

• 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

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)