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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-2017-41
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Review article
07 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).
Intermittent turbulence in the heliosheath and the magnetosheath plasmas based on Voyager and THEMIS data
Wiesław M. Macek1,2, Anna Wawrzaszek2, and Beata Kucharuk1 1Faculty of Mathematics and Natural Sciences, Cardinal Stef an Wyszyński University, Wóycickiego 1/3, 01-938 Warsaw, Poland
2Space Research Centre, Polish Academy of Science, Bartycka 18A, 00-716 Warsaw, Poland
Abstract. Turbulence is complex behavior that is ubiquitous in space, including the environments of the heliosphere and the magnetosphere. Our studies on solar wind turbulence including the heliosheath, and even at the heliospheric boundaries, also beyond the ecliptic plane, have shown that turbulence is intermittent in the entire heliosphere. As is known turbulence in space plasmas often exhibits substantial deviations from normal distributions. Therefore, we also analyze the fluctuations of plasma and magnetic field parameters also in the magnetosheath behind the Earth's bow shock. In particular, based on THEMIS observations, we have already suggested that turbulence behind the quasiperpendicular shock is more intermittent with larger kurtosis then that behind the quasi-parallel shocks. Following this study we would like to present detailed analysis of the level of intermittency in the magnetosheath depending on various characteristics of plasma behind the bow shock and now also near the magnetopause. In particular, we have verified that behind the bow shock turbulence is often more intermittent at higher Alfvenic Mach numbers than at the lower numbers. However, the level of intermittency for the outgoing waves seems to be similar as for the incoming waves, which is consistent with equipartition of energy between these oppositely propagating Alfven waves. We hope that the difference in characteristic behavior of these fluctuations in various regions of space plasmas can help to detect some complex structures in space missions in the near future.

Citation: Macek, W. M., Wawrzaszek, A., and Kucharuk, B.: Intermittent turbulence in the heliosheath and the magnetosheath plasmas based on Voyager and THEMIS data, Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2017-41, in review, 2017.
Wiesław M. Macek et al.
Wiesław M. Macek et al.
Wiesław M. Macek et al.

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