Direct and cross polarized backscatter power from a turbulent plasma

Shkarofsky, I. P.; Ghosh, A. K.; Almey, E N

doi:10.1088/0032-1028/14/10/004

Plasma Phys.

1972

DOI: 10.1088/0032-1028/14/10/004

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Direct and cross polarized backscatter power from a turbulent plasma

I. P. Shkarofsky¹,

A. K. Ghosh²,

E N Almey³

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1974

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Cited by 7 publications

References 13 publications

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Measurements of electromagnetic field modifications in turbulent plasma

Ghosh¹,

Shkarofsky²,

Almey³

1977

Radio Science

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An experimental technique is developed to measure the modification of an electric field in a turbulent plasma. The method is suitable for use up to near critical density of the plasma. Measurements have been performed under three plasma conditions, namely, underdense, intermediate density, and near critical density. The results show more rapid attenuation of the coherent wave than predicted by exponential decrease, which is attributed to refraction in our nonuniform plasma column. The data indicate an initial buildup of the incoherent wave (both direct and cross‐polarized components) and then a decrease to a certain level depending on the equivalent thickness as the wave penetrates into the plasma.

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Measurements of electromagnetic field modifications in turbulent plasma

Ghosh¹,

Shkarofsky²,

Almey³

1977

Radio Science

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A model of radar scattering from a turbulent cylindrical plasma

Bisbing¹

1977

Radio Science

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A theory of scattering from a weakly fluctuating random medium is formulated in terms of the effect of the background medium on the propagation of the incident and scattered waves. The nonrandom background medium is treated by a rigorous representation for electromagnetic waves interacting with a cylindrically symmetric, radially nonuniform plasma. The resulting boundary value problem is solved numerically using a 50-1ayered approximation of the radial distribution. The scattering from the turbulent fluctuations, including depolarization effects, is calculated using existing theories that approximate the plasma by a weakly fluctuating refractive index except that the propagation in the background medium determines the local effective wavenumber and the weight factor for local turbulence scattering. This model is in good agreement with published data on microwave scattering from laboratory plasma where the microwaves do not interact with collisionless overdense regions in the plasma because of refractive effects.

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Microwave scattering from an overdense turbulent plasma

Attwood

1974

The Physics of Fluids

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Experimental results of microwave scattering from a turbulent plasma are presented. For underdense values of mean and fluctuation electron density, scattering is similar to that noted by several other groups, following Born predictions for very weak scattering and saturating as the critical point is approached. Near the critical point for average electron density, a crossover from volume to surface scattering is observed. For sufficiently overdense values, scattering resembles that from a reflecting surface of appropriate shape and statistics, mean density distribution notwithstanding. Scattering in this latter regime is used as a diagnostic tool to determine the probability distribution function for orientation fluctuations displayed by the overdense thrashing plasma column.

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Direct and cross polarized backscatter power from a turbulent plasma

Cited by 7 publications

References 13 publications

Measurements of electromagnetic field modifications in turbulent plasma

Measurements of electromagnetic field modifications in turbulent plasma

A model of radar scattering from a turbulent cylindrical plasma

Microwave scattering from an overdense turbulent plasma

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