Reflection of strong waves by a plasma

Details Reflection of strong waves by a plasma Reflection of strong waves by a plasma

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51...57s&link_type=abstract

Astronomy and Astrophysics, vol. 51, no. 1, Aug. 1976, p. 57-62.

Astronomy and Astrophysics

Astronomy

2

Circular Polarization, Incident Radiation, Monochromatic Radiation, Plasma-Electromagnetic Interaction, Radio Sources (Astronomy), Wave Reflection, Boundary Conditions, Boundary Value Problems, Differential Equations, Plasma Conductivity, Plasma Density, Plasma Turbulence

Scientific paper

The paper analyzes the reflection of a monochromatic strong wave by a semiinfinite plasma. It is noted that a rigorous steady state becomes possible if the incident wave is circularly polarized and has a well-defined frequency. A single ordinary differential equation is obtained which completely describes the steady state, the boundary conditions are discussed, and it is shown that the vacuum fields cannot be connected directly with the evanescent wave. Instead, an intermediate layer of 'stripped' protons appears between the vacuum and plasma regions, providing a longitudinal field which sustains the plasma electrons against the wave pressure. Since the electrons displaced from the proton layer provide the frontal zone of the plasma region with a greatly enhanced conductivity, it is concluded that the strong wave is reflected much more effectively than would be expected on the basis of the usual dispersion relation. The detailed structure of the evanescent wave is discussed for three typical values of the unperturbed electron density.

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