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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/angeo-2018-129
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2018-129
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

ANGEO Communicates 05 Dec 2018

ANGEO Communicates | 05 Dec 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

On the ion-inertial range density power spectra in solar wind turbulence

Rudolf A. Treumann1,3, Wolfgang Baumjohann2, and Yasuhito Narita2 Rudolf A. Treumann et al.
  • 1International Space Science Institute, Bern, Switzerland
  • 2Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • 3Geophysics Department, Ludwig-Maximilians-University Munich, Germany

Abstract. De-magnetised ions in the ion inertial range of quasi-neutral plasmas respond to Kolmogorov inertial range velocity turbulence power spectra via the spectrum of the velocity turbulence related random mean square induction electric field. Maintenance of electrical quasi-neutrality in this field causes deformation in the power spectral density of the density turbulence. Experimentally confirmed Kolmogorov inertial range spectra in solar wind velocity turbulence and observations of density power spectra suggest that the observed unexplained scale-limited occasional bumps in the density power spectrum may be caused by this electric ion response. Magnetic power spectra react passively to the density spectrum by warranting pressure balance. This effect still neglects contribution of Hall currents and is restricted to the ion inertial range scale. It occurs under certain conditions only. While both density and magnetic turbulence spectra in the range of ion inertial scales deviate from Kolmogorov, the velocity turbulence preserves its Kolmogorov inertial range shape in this process to which spectral advection turns out to be secondary.

Rudolf A. Treumann et al.
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Rudolf A. Treumann et al.
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Short summary
Occasional deviations in density and magnetic power spectral densities in an intermediate frequency range are interpreted as ion response to the Kolmogorov turbulent velocity spectrum.
Occasional deviations in density and magnetic power spectral densities in an intermediate...
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