Ionic acoustic wave

The ionic acoustic wave is a Onde of plasma. It belongs to the three clean modes of a plasma not-magnetized with the wave of Langmuir and the Light wave.

They are characterized by low frequencies contrary to the other clean modes.

This low frequency makes it possible to take into account the reaction of the ions to the passage of the wave. Indeed, the pulsation $\backslash \; omega$ is close to the pulsation plasma $\backslash \; omega\_i$ specific to the ions.

Its relation of dispersion is $\backslash \; omega^2=k^2v\_s^2=k^2\; \backslash \; frac\; \{\backslash \; gamma\_eKT\_e+\; \backslash \; gamma\_iKT\_i\}\; \{M\}$

where $v\_s$ is a speed known as acoustic, $T\_e$ and $T\_i$ are the temperatures electronics and ionic respectively, K is the Nombre of wave, K is the Boltzmann constant, M is the mass of the ions, $\backslash \; gamma\_e$ and $\backslash \; gamma\_i$ is the adiabatic indices electronics and ionic.

Like all acoustic Wave, its aspect corpuscular is described by the Phonon S.

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