Possible spectral diagnostics for turbulent electric fields in solar flares

Bakshi, P.; Kalman, G.

doi:10.1007/bf00152268

Cited by 14 publications

(4 citation statements)

References 5 publications

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“…In laboratory plasmas, Langmuir oscillations have for instance been observed as they were excited by electron beams interacting with the plasma [19]. The effect of Langmuir waves on hydrogen Stark profiles has been discussed for a long time in different types of plasmas [4,6,20,21]. In this context simple models for the Langmuir field are given by [20] − → E L (t) = − → E p cos(ω p t + ϕ) , where ω p is the electron plasma frequency, or by [4,5] −…”

Section: Effect Of Langmuir Wavesmentioning

confidence: 99%

Stochastic Processes Applied to the Spectroscopic Diagnostic of Hydrogen in Edge Plasmas

Hannachi

Capes

Godbert‐Mouret

et al. 2014

Contrib. Plasma Phys.

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Stochastic processes may be used as an efficient model for the line shapes affected by Stark effect in edge plasma conditions. We check the accuracy of this approach on the Lyman γ line of hydrogen perturbed by ions only. We also use a stochastic process to investigate the effect of plasma oscillations on a line shape. Our model assumes that Langmuir waves are a sequence of oscillating electric fields changing their amplitude and phase according to an exponential waiting time distribution. The possible effects of Langmuir waves on the Lyman α Stark profile are discussed in edge plasma conditions.

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Section: Effect Of Langmuir Wavesmentioning

confidence: 99%

Stochastic Processes Applied to the Spectroscopic Diagnostic of Hydrogen in Edge Plasmas

Hannachi

Capes

Godbert‐Mouret

et al. 2014

Contrib. Plasma Phys.

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“…For ratios W of the order of one, a Gaussian distribution of the electric-field strengths has been measured [17], and is also predicted theoretically for the highest fields [15]. In the following, we have used a half-normal distribution for the reduced electric-field magnitude F = E/E 0 , with the Holtsmark microfield E 0 defined by E 0 = e/(4πε 0 r 2 0 ), where the average interparticle distance r 0 is given by (4/3)πr 3 0 N e = 1. The PDF P (F ) can be written as a function of the standard deviation σ of F :…”

mentioning

confidence: 90%

“…Introduction. -The influence of collective electric fields on a line shape emitted in a plasma has been studied for several decades in different types of plasmas [1,2,3]. Most of the collective fields considered were described by linear waves, e.g.…”

mentioning

confidence: 99%

Effect of nonlinear wave collapse on line shapes in a plasma

Hannachi¹,

Stamm²,

Rosato³

et al. 2016

EPL

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The nonlinear interaction of waves can change the structural and radiative properties of plasmas. We describe the main features of a fully ionized unmagnetized plasma affected by strong Langmuir turbulence characterized by nonlinear wave collapse, and propose a simple model for evaluating the changes expected on a hydrogen line shape affected by such conditions. Our model is based on a stochastic renewal model using an exponential waiting time distribution and a half-normal probability density function for the electric field magnitude of the turbulent wave packet. The first results obtained with a simulation calculation of the hydrogen L  line show that strong Langmuir turbulence can provide an additional broadening to a Stark profile.

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“…Theoretical papers: 2577,2612,2621 ,2638,2808,2827,2831 ,2880,3012,3048, 3054 Combined theoretical-comments: 2708,3006 Combined theoretical-experimental: 2792…”

Section: Astrophysical Applicationsmentioning

confidence: 99%

Bibliography on atomic line shapes and shifts (June 1975 through June 1978)

Fuhr¹,

Miller²,

Martin³

1978

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This is the third supplement to the NBS Special Publication 366, Bibliography on Atomic Line Shapes and Shifts (1889 through March 1972). It contains about 600 references and covers the literature from June 1975 through June 1978. As before, the bibliography contains five major parts: (1) All general interest papers are catalogued according to the broadening mechanisms (and, further, according to special topics under several of the mechanisms) and as to whether the work is a general theory, a general review, a table of profiles or parameters, a comment on existing work, a study of general experimental measurement techniques, or an experimental effort of general importance. Also included are selected papers on important applications of line broadening and on miscellaneous topics relating to atomic spectral line shapes and shifts. (2) In Part 2 all papers containing numerical data are ordered as to element, ionization stage, and broadening mechanism (in the case of foreign gas broadening the perturbing species are listed), and it is indicated whether the data are experimentally or theoretically derived. (3) While in the two preceding parts of the bibliography the references are listed for brevity by identification numbers only, in Part 3 all references are listed completely by journal, authors, and title and are generally arranged by year of publication and alphabetically by authors' names within the year. (4) This section contains a list of all authors and their papers. (5) A final section provides corrections or additions to the second supplement to the original bibliography.

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Possible spectral diagnostics for turbulent electric fields in solar flares

Cited by 14 publications

References 5 publications

Stochastic Processes Applied to the Spectroscopic Diagnostic of Hydrogen in Edge Plasmas

Stochastic Processes Applied to the Spectroscopic Diagnostic of Hydrogen in Edge Plasmas

Effect of nonlinear wave collapse on line shapes in a plasma

Bibliography on atomic line shapes and shifts (June 1975 through June 1978)

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