dorsal/arxiv
View SchemaMeasurement of the electric fluctuation spectrum of magnetohydrodynamic turbulence
| Authors | S. D. Bale, P. J. Kellogg, F. S. Mozer, T. S. Horbury, H. Reme |
|---|---|
| Categories | |
| ArXiv ID | physics/0503103 |
| URL | https://arxiv.org/abs/physics/0503103 |
| DOI | 10.1103/PhysRevLett.94.215002 |
Abstract
Magnetohydrodynamic (MHD) turbulence in the solar wind is observed to show the spectral behavior of classical Kolmogorov fluid turbulence over an inertial subrange and departures from this at short wavelengths, where energy should be dissipated. Here we present the first measurements of the electric field fluctuation spectrum over the inertial and dissipative wavenumber ranges in a $\beta \gtrsim 1$ plasma. The $k^{-5/3}$ inertial subrange is observed and agrees strikingly with the magnetic fluctuation spectrum; the wave phase speed in this regime is shown to be consistent with the Alfv\'en speed. At smaller wavelengths $k \rho_i \geq 1$ the electric spectrum is softer and is consistent with the expected dispersion relation of short-wavelength kinetic Alfv\'en waves. Kinetic Alfv\'en waves damp on the solar wind ions and electrons and may act to isotropize them. This effect may explain the fluid-like nature of the solar wind.
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"abstract": "Magnetohydrodynamic (MHD) turbulence in the solar wind is observed to show\nthe spectral behavior of classical Kolmogorov fluid turbulence over an inertial\nsubrange and departures from this at short wavelengths, where energy should be\ndissipated. Here we present the first measurements of the electric field\nfluctuation spectrum over the inertial and dissipative wavenumber ranges in a\n$\\beta \\gtrsim 1$ plasma. The $k^{-5/3}$ inertial subrange is observed and\nagrees strikingly with the magnetic fluctuation spectrum; the wave phase speed\nin this regime is shown to be consistent with the Alfv\\\u0027en speed. At smaller\nwavelengths $k \\rho_i \\geq 1$ the electric spectrum is softer and is consistent\nwith the expected dispersion relation of short-wavelength kinetic Alfv\\\u0027en\nwaves. Kinetic Alfv\\\u0027en waves damp on the solar wind ions and electrons and may\nact to isotropize them. This effect may explain the fluid-like nature of the\nsolar wind.",
"arxiv_id": "physics/0503103",
"authors": [
"S. D. Bale",
"P. J. Kellogg",
"F. S. Mozer",
"T. S. Horbury",
"H. Reme"
],
"categories": [
"physics.space-ph",
"physics.plasm-ph"
],
"doi": "10.1103/PhysRevLett.94.215002",
"title": "Measurement of the electric fluctuation spectrum of magnetohydrodynamic turbulence",
"url": "https://arxiv.org/abs/physics/0503103"
},
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