Accession Number:

ADA162159

Title:

Physics of Natural and HF - Induced Ionospheric Disturbances and Their Effects on Radio Communication.

Descriptive Note:

Final rept. 1 Feb 83-30 Jun 85,

Corporate Author:

REGIS COLL RESEARCH CENTER WESTON MA

Personal Author(s):

Report Date:

1985-06-30

Pagination or Media Count:

86.0

Abstract:

We report a theoretical study of ionospheric disturbances caused by either natural or man-made processes. Thirteen papers published in either technical journals or conference proceedings are compiled in this report, These papers discuss 1 the identification of the sources of free energy, the optimum conditions for plasma instabilities as the courses of naturally occurring ionospheric irregularities, and 2 the nonlinear effects leading to the HF ionospheric disturbances such as lower hybrid waves, upper hybrid waves, ionospheric irregularities, and geomagnetic field fluctuations. Originator-supplied keywords Ohmic dissipation of Pederson current, High-latitude F region ionospheric irregularities, Thermal instabilities, Polar cap, Lower hybrid waves, Field aligned plasma density striations, Whistlers, Magnetostatic fluctuations, Filamentation instability, Thermal source, Geomagnetic field fluctuations, Ionospheric heating, Langumiur waves, Saturation spectrum of parametric decay instability, Upper hybrid waves, O-mode and X-mode pump waves, Pondermotive force, Plasma line enhancement, Beating current, Non-oscillatory modes, Oscillatory two-stream instability, Nonlinear effects, Spread F echoes, Modulational instability.

Subject Categories:

  • Atmospheric Physics
  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE