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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/angeo-2020-24
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2020-24
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 May 2020

11 May 2020

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A revised version of this preprint was accepted for the journal ANGEO and is expected to appear here in due course.

Resolution dependence of magnetosheath waves in global hybrid-Vlasov simulations

Maxime Dubart1, Urs Ganse1, Adnane Osmane1, Andreas Johlander1, Markus Battarbee1, Maxime Grandin1, Yann Pfau-Kempf1, Lucile Turc1, and Minna Palmroth1,2 Maxime Dubart et al.
  • 1Department of Physics, University of Helsinki, Helsinki, Finland
  • 2Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland

Abstract. Plasma waves are ubiquitous in the Earth's magnetosheath. The most commonly observed waves arise from instabilities generated by temperature anisotropy of the ions, such as the mirror and proton cyclotron instabilities. We investigate here the spatial resolution dependence of the mirror and proton cyclotron instabilities in a global hybrid-Vlasov simulation using the Vlasiator model. We compare the proton velocity distribution functions, power spectra and growth rates of the instabilities in a set of simulations with three different spatial resolutions but otherwise identical set-up. We find that the proton cyclotron instability is absent at the lowest resolution and that only the mirror instability remains, which leads to an increased temperature anisotropy in the simulation. We conclude that the proton cyclotron instability is resolved well enough at the highest spatial resolution and that an increase of resolution does not improve the resolution of the instability enough to justify this increase at the cost of numerical resources in future simulations. We also find that a resolution around 0.6 the inertial length in the solar wind, presents an acceptable minimum spatial resolution in which the proton cyclotron is still correctly resolved. These results should be taken into consideration regarding the optimal grid spacing for the modelling of magnetosheath waves, within available computational resources.

Maxime Dubart et al.

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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Maxime Dubart et al.

Video supplement

Magnetic Field magnitude and VDFs resolution 300km M. Dubart, U. Ganse, A. Osmane, A. Johlander, M. Battarbee, M. Grandin, Y. Pfau-Kempf, L. Turc, and M. Palmroth https://doi.org/10.5446/46345

Magnetic Field magnitude and VDFs resolution 600km M. Dubart, U. Ganse, A. Osmane, A. Johlander, M. Battarbee, M. Grandin, Y. Pfau-Kempf, L. Turc, and M. Palmroth https://doi.org/10.5446/46730

Magnetic Field magnitude and VDFs resolution 900km M. Dubart, U. Ganse, A. Osmane, A. Johlander, M. Battarbee, M. Grandin, Y. Pfau-Kempf, L. Turc, and M. Palmroth https://doi.org/10.5446/46731

Maxime Dubart et al.

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Latest update: 24 Nov 2020
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Short summary
Plasma waves are ubiquitous in the Earth's magnetosphere. They are responsible for many energetic processes happening in Earth's atmosphere, such as auroras. In order to understand these processes, thorough investigations of these waves are needed. We use a state-of-the-art numerical model to do so. Here we investigate the impact of different spatial resolutions in the model on these waves in order to improve in the future the model without wasting computational resources.
Plasma waves are ubiquitous in the Earth's magnetosphere. They are responsible for many...
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