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Inverse cascade and magnetic vortices in kinetic Alfvén-wave turbulence
| Content Provider | Scilit |
|---|---|
| Author | Miloshevich, G. Laveder, D. Passot, T. Sulem, P. L. |
| Copyright Year | 2021 |
| Description | A Hamiltonian two-field gyrofluid model for kinetic Alfvén waves (KAWs) in a magnetized electron–proton plasma, retaining ion finite-Larmor-radius corrections and parallel magnetic field fluctuations, is used to study the inverse cascades that develop when turbulence is randomly driven at sub-ion scales. In the directions perpendicular to the ambient field, the dynamics of the cascade turns out to be non-local and the ratio $\chi _f$ of the wave period to the characteristic nonlinear time at the driving scale affects some of its properties. For example, at small values of $\chi _f$ , parametric decay instability of the modes driven by the forcing can develop, enhancing for a while inverse transfers. The balanced state, obtained at early time when the two counter-propagating waves are equally driven, also becomes unstable at small $\chi _f$ , leading to an inverse cascade. For $\beta _e$ smaller than a few units, the cascade slows down when reaching the low-dispersion spectral range. For higher $\beta _e$ , the ratio of the KAW to the Alfvén frequencies displays a local minimum. At the corresponding transverse wavenumber, a condensate is formed, and the cascade towards larger scales is then inhibited. Depending on the parameters, a parallel inverse cascade can develop, enhancing the elongation of the ion-scale magnetic vortices that generically form. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/2161FACEE036D89CB897E15F20DF2000/S0022377820001531a.pdf/div-class-title-inverse-cascade-and-magnetic-vortices-in-kinetic-alfven-wave-turbulence-div.pdf |
| ISSN | 00223778 |
| e-ISSN | 14697807 |
| DOI | 10.1017/s0022377820001531 |
| Journal | Journal of Plasma Physics |
| Issue Number | 2 |
| Volume Number | 87 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2021-03-08 |
| Access Restriction | Open |
| Subject Keyword | Journal of Plasma Physics Fluids and Plasmas Physics Astrophysical Plasmas Plasma Waves Plasma Simulation |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics |
