VLF/LF TE-Mode Propagation under Disturbed Ionospheric Conditions

Abstract

The report compares calculated attenuation rates for transverse magnetic (TM) and transverse electric (TE) modes propagating in the earth- ionosphere waveguide. Frequencies from 10 to 50 kHz are considered, and attention is restricted to situations where the fields can be represented in terms of the least-attenuated TM or TE mode. Nine model ionospheres corresponding to conditions caused by widespread high-altitude fission debris are used as inputs to the calculations. Certain of these models are also representative of polar-cap-absorption (PCA) events. The calculations utilize full-wave methods, and account for the vertical inhomogeneity of the ionosphere, the effects of heavy ions, and the curvature of the earth. In addition to the modal attenuation rates, results are given for field-strength height-profiles, plane-wave ionospheric reflection coefficients, and the relative importance of heavy ions vis-a-vis electrons.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1975
Accession Number
ADA016527

Entities

People

  • Edward C. Field
  • Michael A. Dore

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Altitude
  • Coefficients
  • Collisions
  • Electrons
  • Environment
  • Frequency
  • Height
  • High Altitude
  • Ion Density
  • Ionosphere
  • Pair Production
  • Plane Waves
  • Polar Cap
  • Polar Cap Absorption
  • Production Rate
  • Transverse

Fields of Study

  • Physics

Readers

  • Plasma Physics / Magnetohydrodynamics
  • Space/Atmospheric Physics.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene