Theory of waves incoherently scattered

Details Theory of waves incoherently scattered Theory of waves incoherently scattered

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.280..167b&link_type=abstract

Royal Society (London), Philosophical Transactions, Series A, vol. 280, no. 1293, Oct. 23, 1975, p. 167-191.

Computer Science

5

Electromagnetic Scattering, Incoherent Scattering, Ionospheric Propagation, Plasma-Electromagnetic Interaction, Thomson Scattering, Fourier Analysis, Free Electrons, Incident Radiation, Photoelectrons, Plasma Frequencies, Spatial Filtering, Wave Scattering

Scientific paper

Electromagnetic waves impinging upon a plasma at frequencies larger than the plasma frequency suffer weak scattering. The scattering arises from the existence of electron density fluctuations. The so-called incoherent scattering theory basically deals with fluctuations of random thermal origin; however, for practical purposes, it must also take account of these fluctuations caused by streaming photo-electrons. As is well known, in any scattering experiment, the received signal corresponds to a particular spatial Fourier component of the fluctuations, the wavevector of which is a function of the wavelength of the radiowave. Wavelengths short with respect to the Debye length of the medium relate to fluctuations due to noninteracting Maxwellian electrons, while larger wavelengths relate to fluctuations due to collective Coulomb interactions. In the latter case, the scattered signal exhibits a spectral distribution which is characteristic of the main properties of the electron and ion gases and, therefore, provides a powerful diagnosis of the state of the plasma.

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