Accession Number : AD0647845

Title :   STUDY OF SUB-AUDIO GEOMAGNETIC FLUCTUATIONS.

Descriptive Note : Final rept., 1 Oct 61-31 Dec 66,

Corporate Author : DENVER UNIV COLO

Personal Author(s) : Mason,George L. ; Higgins,Charles R.

Report Date : 28 FEB 1967

Pagination or Media Count : 78

Abstract : Recording of natural fluctuations of the geomagnetic field, in the frequency range .01 to 5 cps at Barrow, Alaska and Huancayo, Peru, and in the 1 to 50 cps range at Shickley, Nebraska and Huancayo, Peru, is described. The schedule of recording periods actually realized between 1 October 1961 and 31 December 1966 is given. The recording system used for the .01 to 5 cps range is described, together with auxiliary instrumentation developed in connection with recording operations in this range, and for playback and reduction of both frequency ranges. Examples of reduced data in the form of Octave-Band and 1/6 Octave-Band plots are presented for the 1 to 50 cps range, also Rayspan spectral analysis charts. Schumann resonance phenomena are clearly displayed in both forms of presentation. (Author)

Descriptors :   (*GEOMAGNETISM, PERIODIC VARIATIONS), MAGNETIC FIELDS, EXPERIMENTAL DATA, RECORDING SYSTEMS, INSTRUMENTATION, DIAGRAMS, RESONANCE, EXTREMELY LOW FREQUENCY, ALASKA, PERU, NEBRASKA

Subject Categories : Geomagnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE