RESEARCH ON VLF PROPAGATION IN ARCTIC REGIONS. GEOPHYSICAL EFFECTS

Abstract

Atmospheric noise data collected in the Arctic were used to determine certain geophysical effects on VLF propagation between 3 and 30 kc in arctic regions. The effect of sudden ionospheric disturbances in the form of a sudden enhancement of atmospherics is defined in the 3 to 30 kc frequency band. Very-low-frequency propagation along the Fairbanks-Thule great-circle path,AS MEASURED BY Fourier analysis of atmospherics, is non-reciprocal but disagrees with non-reciprocal measurements at mid-latitudes. The influence of a polar-cap-absorption event on atmospheric noise is shown, along with variations in atmospheric noise spectrum that are related to some unexplained VLF propagation phenomena. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1961
Accession Number
AD0256062

Entities

People

  • Arthur L. Whitson

Organizations

  • SRI International

Tags

DTIC Thesaurus Topics

  • Arctic Regions
  • Atmospherics
  • Fourier Analysis
  • Frequency
  • Frequency Bands
  • Grids
  • Ionospheric Disturbances
  • Latitude
  • Polar Cap
  • Polar Cap Absorption
  • Regions
  • Very Low Frequency

Readers

  • Space/Atmospheric Physics.