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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-135
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-135
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 16 Sep 2019

Submitted as: regular paper | 16 Sep 2019

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

A multi-fluid model of the magnetopause

Roberto Manuzzo1,2, Francesco Califano2, Gerard Belmont1, and Laurence Rezeau1 Roberto Manuzzo et al.
  • 1LPP, CNRS, Ecole Polytechnique, Sorbonne Université, Univ. Paris-Sud, Observatoire de Paris, Université Paris-Saclay, PSLResearch University, France
  • 2Department of Physics E. Fermi, Universitá di Pisa, Italy

Abstract. Observation of the solar wind – magnetosphere boundary provides a unique opportunity to investigate the physics underlying the interaction between two collisionless magnetized plasmas with different temperature, density and magnetic field topology. Their mixing across the interface as well as the boundary dynamics are affected by the development of fluid (and kinetic) instabilities driven by large scale inhomogeneities in particle and electromagnetic fields. Building up a realistic initial equilibrium state of the magnetopause according to observations is still a challenge nowadays. In this paper we address the modeling of the particles and electromagnetic fields configuration across the Earth's magnetopause by means of a three-fluid analytic model. The model relies on one hot and one cold ion population and on a neutralizing electron population. The goal is to build up an analytic model able to reproduce as closely as possible the observations. Some parameters of the model are set by using a fit procedure aiming at minimizing their difference with respect to experimental data provided by the Magnetospheric MultiScale mission. All the other profiles, concerning the electron pressure and the relative densities of the cold and hot ion populations, are calculated in order to satisfy the fluid equilibrium equations. Finally, by means of a new tri-fluid code, we have checked the stability of the large-scale equilibrium model for a given experimental case and given the proof that the system is unstable to reconnection. This model could be of interest for the interpretation of satellite results and for the study of the dynamics at the boundary between the Magnetosphere and the solar wind.

Roberto Manuzzo et al.
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Roberto Manuzzo et al.
Model code and software

Being on time in magnetic reconnection M. Faganello, F. Califano, and F. Pegoraro https://doi.org/10.1088/1367-2630/11/6/063008

Roberto Manuzzo et al.
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Short summary
We investigate the magnetopause stability and mixing by a new 3fluid model aimed at reproducing at best the system configuration obtained directly from satellite data. This "realistic" model is a basic starting point for numerical simulations. The realistic 3fluid equilibrium presented in this paper should allow for a step further and could be applied to other experimental cases in the future. MMS DATA AVAILABLE AT: MMS data server: https://lasp.colorado.edu/mms/sdc/public/about/browse-wrapper.
We investigate the magnetopause stability and mixing by a new 3fluid model aimed at reproducing...
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