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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/npg-2017-24
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
06 Jun 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).
Lifetime estimate for plasma turbulence
Yasuhito Narita1,2,3 and Zoltán Vörös1,2,4,5 1Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria
2Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria
3Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany
4Geodetic and Geophysical Institute, RCAES, Hungarian Academy of Sciences, Sopron, Hungary
5Department of Geophysics and Space Sciences, Eötvös University, Budapest, Hungary
Abstract. A method is proposed to experimentally determine the intrinsic time scale or a decay rate of turbulent fluctuations. The method is based on the assumption that the Breit-Wigner spectrum model with a non-Gaussian frequency broadening is valid in the data analysis. The decay rate estimate is applied to the multi-spacecraft magnetic field data in interplanetary space, yielding that the result that the decay rate on spatial scales of about 1000 km (about 10 times larger than the ion inertial length) is higher than the theoretical predictions from the random sweeping time scale of the eddy turnover time. The faster decay of fluctuation components in interplanetary space is interpreted as a realization of plasma physical (and not fluid mechanical) process.

Citation: Narita, Y. and Vörös, Z.: Lifetime estimate for plasma turbulence, Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2017-24, in review, 2017.
Yasuhito Narita and Zoltán Vörös
Yasuhito Narita and Zoltán Vörös
Yasuhito Narita and Zoltán Vörös

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Short summary
A method is proposed to determine the temporal decay rate of turbulent fluctuations, and is applied to four-point magnetic field data in interplanetary space. The measured decay or the energy transfer rate is larger than the theoretical estimate from the fluid turbulence theory. The faster decay represents one of the differences in turbulent processes between fluid and plasma media.
A method is proposed to determine the temporal decay rate of turbulent fluctuations, and is...
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