Accession Number : AD0757482

Title :   Detection and Processing of ELE (3-30 Hz) Natural Electromagnetic Noise.

Descriptive Note : Final rept. (Part 1) 16 Nov 69-15 Nov 72,

Corporate Author : RHODE ISLAND UNIV KINGSTON DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Keefe,Thomas J. ; Etzold,Hellmuth ; Polk,Charles

Report Date : 15 JAN 1973

Pagination or Media Count : 91

Abstract : Equipment is described which permits the continuous recording of natural electromagnetic noise in the 3 Hz to 30 Hz frequency band. Sensors for two orthogonal components of the horizontal magnetic field are two meter diameter, 44000 turn air-core coils. The vertical electric field is detected either by a whip antenna or by an insulated metallic sphere located approximately ten meters above ground level. D.C. operated preamplifiers are located at the sensors, and the amplified signal is transferred 600 feet to a building where it is further amplified, filtered and direct recorded continuously on magnetic tape. (Author Modified Abstract)

Descriptors :   (*RADIOFREQUENCY INTERFERENCE, EXTREMELY LOW FREQUENCY), (*MAGNETIC RECORDING SYSTEMS, RADIOFREQUENCY INTERFERENCE), (*IONOSPHERIC DISTURBANCES, EXTREMELY LOW FREQUENCY), ANTENNAS, COILS, DETECTORS, INSTRUMENTATION, MAGNETOMETERS, ATMOSPHERICS

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE