FURTHER OBSERVATIONS OF SUNRISE AND SUNSET FADING OF VERY-LOW-FREQUENCY SIGNALS

Abstract

An earlier explanation of sunrise fading on long VLF paths is confirmed by examining data taken over a wider range of frequency and directions of propagation. It is found, however, that there is an appreciable dependence of the fading period on the magnetic direction of propagation. It is shown that this dependence is qualitatively in agreement with what would be expected from a sharply bounded ionosphere and a transverse magnetic field.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1965
Accession Number
AD0629331

Entities

People

  • D. D. Crombie

Organizations

  • Institute for Telecommunication Sciences

Tags

DTIC Thesaurus Topics

  • Agreements
  • Boundaries
  • Diurnal Variations
  • Electromagnetic Wave Propagation
  • Electron Density
  • Electrons
  • Experimental Data
  • Frequency
  • Ionosphere
  • Magnetic Fields
  • New Zealand
  • Observation
  • Phase Shift
  • Phase Velocity
  • Reflection
  • Transmitters
  • Very Low Frequency

Fields of Study

  • Physics

Readers

  • Astronomy and Astrophysics.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Radar Systems Engineering.