The results of recent developments in the theory of fluctuations in plasmas show that the previously used theory of bremsstrahlung is incomplete and the exact expressions for bremsstrahlung should include transition bremsstrahlung. The collective effects in bremsstrahlung known previously as Debye screening are changed to a qualitatively different structure, which removes the effect of ion polarization in bremsstrahlung and introduces a new effective polarization which depends on an effective ion charge and electron velocity. The results may be relevant for applications in plasmas when the wavelength is greater than the Debye length. It is shown that for the problem of photon transport in the solar interior the correct collective corrections to the bremsstrahlung change the opacity by only about −0·35%, which is less than was calculated previously when collective effects in bremsstrahlung where estimated without taking recent results of plasma fluctuation theory into account
We give an approximate analytical solution, correct to the first order in m / M , the electron to ion mass ratio, for the ion background modification under the influence of the free non linear electron plasma oscillations driven by the initial unbalance between electron and ion density distribution, n,(x, 0) = no and n,(x, 0) = n,(l + a cos kx). When the electron plasma oscillations grow starting from a very small perturbation (a 5 0.02), we find a remarkable modification in the ion background profile before the electron oscillation wavebreaking takes place.
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