Effects of Strong Local Sporadic E on ELF Propagation.

Abstract

A simple Kirchhoff-Huygens diffraction model has been used to estimate the effect of a patch of sporadic E on propagation in the lower ELF band. The patch is approximated by a lumped parameter phase-amplitude screen allowed to move along a great circle path normal to the transmitter-receiver great circle path. The results indicate that sporadic E patches on the order of 1000 x 1000 km, causing phase rate shifts and attenuation rate enhancements consistent with full wave modal evaluations, can account for the 6-8 dB fades observed in connection with 1600 km Wisconsin Test Facility (WTF) transmissions. The results suggest also that such disturbances can be expected to produce 2 to 4 dB fades over paths as long as 10,000 km. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Aug 15, 1978
Accession Number
ADA061570

Entities

People

  • L. R. Shockey
  • R. A. Pappert

Tags

Communities of Interest

  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Atmospheric Sciences
  • Department Of Defense
  • Diffraction
  • Ecology
  • Engineering
  • Frequency
  • Fresnel Zones
  • Geometry
  • Ionosphere
  • Jet Propulsion
  • Military Research
  • Navy
  • Night
  • Phase Shift
  • Phase Velocity
  • Physics Laboratories
  • Test Facilities

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Space/Atmospheric Physics.