Eur. Phys. J. D (2017) 71: 68
https://doi.org/10.1140/epjd/e2017-70737-2

Regular Article

Line shapes in turbulent plasmas^*

¹ PIIM, UMR 7345 Aix-Marseille Université/CNRS, Centre de Saint-Jérôme, 13397 Marseille Cedex 20, France
² PRIMALAB, Faculty of material sciences, University of Batna 1, 5 Av. Chahid Boukhlouf, 05000 Batna, Algeria
³ Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia

^a e-mail: roland.stamm@univ-amu.fr

Received: 25 November 2016
Received in final form: 7 February 2017
Published online: 21 March 2017

Abstract

The fluctuations and oscillations observed in turbulent plasmas may affect the line shapes emitted by atoms and ions. We investigate several plasma conditions for which a spectroscopic signature of plasma turbulence can be observed. Starting from the simple model of microturbulence for Doppler profile, we examine how information on turbulent fluctuations is obtained in astrophysics and magnetic fusion plasmas. We recall the potential of a formalism which expresses the measured line shape in function of the probability density function of the fluctuating plasma parameters. New calculations of hydrogen dipole autocorrelation functions and line shapes are presented for plasmas affected by strong Langmuir turbulence and nonlinear wave collapse. We propose a model using a sequence of envelope solitons for the electric field created by the wave packets and felt by the emitters, and show that the line shape may be dominated by the effect of strong Langmuir turbulence.