Accession Number : AD0282242

Title :   NOISE EMISSIONS IN THE AUDIO-FREQUENCY RANGE.

Descriptive Note : Final rept.

Corporate Author : KIRUNA GEOPHYSICAL OBSERVATORY (SWEDEN)

Personal Author(s) : Egeland ,Alv ; Olsen ,Sven ; Gustafsson,Georg

Report Date : 07 MAR 1962

Pagination or Media Count : 23

Abstract : Broadband noise emissions in the audiofrequency range, as well as the dirurnal variation of this background noise The measurements were studied. Were carried out near Paksuniemi, about 25 kms east of Kiruna Geophysical Observatory at a place which is almost free from man-made contamination. The nearest 50 cps power lines are more than 7 km from the observation site. Spectrograms of the electromagnetic energy in the frequency region between 10 cps and 10 kc/s have been monitored continuously from November 14, 1961, to January 29, 1962. A description of the receiving equipment, the antennas and methods of measurement is given. (Author)

Descriptors :   *RADIO WAVES, EXTREMELY LOW FREQUENCY, AUDIO FREQUENCY, IONOSPHERE, MEASUREMENT, INSTRUMENTATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE