EXPERIMENTAL RESEARCH INVESTIGATION OF EXTREMELY LOW FREQUENCY PROPAGATION.

Abstract

ELF electromagnetic wave propagation was investigated by measuring the characteristics of cw signals transmitted over a 400 cps link established between Bishop, California and Rome, New York; a distance of approximately 4000 km. Data which could be reduced to yield signal strength, attenuation rate, transmission path phase variations, and atmospheric noise amplitude probability distributions (APD) was recorded at the Rome, New York receiver site. Data from the current and previous contract has been compiled to show the range of measured propagation constants. The median measured attenuation constant (rate) is 3 db/1000 km for a nighttime path and 7.8 db/1000 km for a daytime path. The median measured diurnal phase shift constant, through the sunrise period, is 0.13. Measurements are compared with path characteristics calculated using existing theoretical treatments of ELF propagation. Samples of atmospheric noise impulse data and the corresponding atmospheric noise amplitude probability distribution are presented. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1964
Accession Number
AD0609719

Entities

People

  • P. I. Kuhnle
  • R. D. Smith

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Attenuation
  • California
  • Contracts
  • Electromagnetic Wave Propagation
  • Extremely Low Frequency
  • Frequency
  • Mathematics
  • Measurement
  • New York
  • Phase Shift
  • Probability
  • Probability Distributions
  • Wave Propagation

Fields of Study

  • Environmental science

Readers

  • Acoustics.
  • Radio communications and signal processing.
  • Space Exploration and Orbital Mechanics.