High Frequency Scattering in the Lower D-Region at Ft. Churchill during the November 2, 1969 Polar Cap Absorption Event.

Abstract

Low-lying D-region ionosonde echoes, observed during the Polar Cap Absorption Event of November 2, 1969 at Ft. Churchill, are shown to be consistent with scattering from turbulent irregularities in electron density and collision frequency. A radar-type equation relating the scattering cross-section of the ionosphere, ionospheric absorption and the ionosonde system parameters is developed. Calculations of a receiver detection parameter, using available experimental data for the PCA, and assumed threshold levels for detection are combined to construct analytical ionograms. The results indicate a general agreement with the observed ionograms and a sensitivity to irregularity scale size, strength and spatial autocorrelation. (Modified author abstract)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
AD0774301

Entities

People

  • S. C. Shah
  • T. A. Seliga

Organizations

  • Ohio State University

Tags

DTIC Thesaurus Topics

  • Absorption
  • Detection
  • Electron Density
  • Electrons
  • Experimental Data
  • Frequency
  • Ionograms
  • Ionosondes
  • Ionosphere
  • Polar Cap
  • Polar Cap Absorption
  • Regions
  • Scattering
  • Scattering Cross Sections

Fields of Study

  • Environmental science
  • Physics

Readers

  • Molecular Photonics/Laser Physics
  • Space/Atmospheric Physics.
  • Statistical inference.

Technology Areas

  • Microelectronics