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Radiophysics and Quantum Electronics

, Volume 50, Issue 7, pp 555–569 | Cite as

On a mechanism forming a broadband maximum in the spectrum of background noise at frequencies 2–6 Hz

  • E. N. Ermakova
  • D. S. Kotik
  • S. V. Polyakov
  • A. V. Shchennikov
Article

Abstract

We study the properties of a broadband spectral maximum (BSM) of the background noise at frequencies 2–6 Hz using the data of mid-latitude observations. We find that the parameters of the maximum depend on the local ionosphere properties and that small scales (several tens of km) are absent in the field distribution at the BSM frequencies. We propose a mechanism forming the BSM, which is related to the large gradients of the refractive indices of normal ionospheric-plasma waves at altitudes from 70 to 300 km. The performed simulation of BSM spectra for a plane-stratified model of anisotropic inhomogeneous ionosphere allowed us to explain the main experimentally observed BSM properties.

Keywords

Normal Wave Electron Number Density Ionospheric Plasma Spectral Maximum Ionospheric Parameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • E. N. Ermakova
    • 1
  • D. S. Kotik
    • 1
  • S. V. Polyakov
    • 1
  • A. V. Shchennikov
    • 1
  1. 1.Radiophysical Research InstituteNizhny NovgorodRussia

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