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Observation of Electrostatic Resonances of the Ionospheric Plasma

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Abstract

THE theory of electrostatic waves is highly developed1–3. The propagation of electrostatic waves has been observed in laboratory plasmas by measuring the time required for a pulse of these waves to travel between antennae imbedded in the plasma4. Resonance phenomena have been expected to appear in a plasma irradiated with radio waves at frequencies for which the group velocity of the electrostatic waves is zero or small. This concept has been used5 to explain certain previously observed resonances. Bernstein's theory, however, also predicts zero group velocity at frequencies for which resonances have not previously been observed. A simplified approximate equation has been developed by Stix6 and improved by Dougherty and Monaghan7 to predict the frequencies at which these electrostatic resonances should appear. The resonances observed by instruments carried on satellites may correspond to a finite group velocity that matches the velocity of the satellites.

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References

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Authors and Affiliations

  1. Radio Physics Laboratory, Defence Research Telecommunications Establishment, Shirley Bay, Ottawa, Canada

    E. S. WARREN & E. L. HAGG

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  1. E. S. WARREN
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  2. E. L. HAGG
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WARREN, E., HAGG, E. Observation of Electrostatic Resonances of the Ionospheric Plasma. Nature 220, 466–468 (1968). https://doi.org/10.1038/220466a0

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  • DOI: https://doi.org/10.1038/220466a0

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