Effects of the Second Harmonic on the GAM in Electron Scale Turbulence

doi:https://doi.org/10.48550/arxiv.1401.6300

Open AccessArticle10.48550/arxiv.1401.6300

Effects of the Second Harmonic on the GAM in Electron Scale Turbulence

Johan Anderson,H. Nordman,R. Singh-2014-01-24-arXiv (Cornell University)

TL;DRAbstract

The effects higher order harmonics have been self-consistently included in the derivation of the electron branch of the electron Geodesic Acoustic Mode (el-GAM) in an Electron-Temperature-Gradient (ETG) turbulence background. The work is based on a two-fluid model including finite $β$-effects while retaining non-adiabatic ions. In solving the linear dispersion relation, it is found that the due to the coupling to the $m=2$ mode the real frequency may be significantly altered and yield higher values.

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The effects higher order harmonics have been self-consistently included in the derivation of the electron branch of the electron Geodesic Acoustic Mode (el-GAM) in an Electron-Temperature-Gradient (ETG) turbulence background. The work is based on a two-fluid model including finite $β$-effects while retaining non-adiabatic ions. In solving the linear dispersion relation, it is found that the due to the coupling to the $m=2$ mode the real frequency may be significantly altered and yield higher values.

Keywords

Dispersion relationPhysicsAdiabatic processElectronHarmonicsTurbulenceCoupling (piping)Scale (ratio)

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