Active Ionospheric Generation on ELF/VLF Waves.

Abstract

Our work during the past year on active ELF/VLF generation has produced major breakthroughs in the understanding of nonlinear interactions in a dissipating medium such as the ionosphere for the purpose of downconverting H.F. to ELF/VLF waves. A key result was the fact that the contrary to the conventional understanding of such processes, the presence of a dissipative medium lowers the threshold for complete decay and increases the downconversion efficiency over the one expected on the basis of the Manley rowe relations. Two codes were developed and optimized. (I) The first code named CMPOWER required as input a model of the ionospheric electron density and magnetic field, and the transmitter characteristics. It's output is the ELF/VLF signal as a function of the modulation frequency and distance from the HF facility. (II) The second named TWC (three wave coupling) is a nonlinear code, which includes dissipation and finite pump size effects. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 09, 1984
Accession Number
ADA139317

Entities

People

  • Chuan‐Chieh Chang
  • K. Ko
  • K. Papadopoulos

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Collisions
  • Electric Fields
  • Electron Density
  • Electrons
  • Energy
  • Energy Transfer
  • Equations
  • Frequency
  • Group Velocity
  • Load Monitoring
  • Magnetic Fields
  • Modulation
  • New York
  • Peak Power
  • Power
  • Steady State
  • Wave Packets

Readers

  • Optical Physics and Photonics.
  • Plasma Physics / Magnetohydrodynamics
  • Space/Atmospheric Physics.

Technology Areas

  • Microelectronics