EGU21-8342, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-8342
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Instantaneous multiscale properties of solar wind dynamical regimes and their attractors

Theophile Caby1, Tommaso Alberti2, Davide Faranda3, Reik V. Donner4, Giuseppe Consolini2, Sandro Vaienti5, and Vincenzo Carbone6
Theophile Caby et al.
  • 1Université des Antilles, Laboratoire de Mathématiques Informatique et Applications, Pointe-à-Pitre Cedex, Guadeloupe, France
  • 2Istituto Nazionale di Astrofisica, Istituto di Astrofisica e Planetologia Spaziali, Roma, Italy
  • 3Laboratoire des Sciences du Climat et de l’Environnement, UMR 8212 CEA-CNRS-UVSQ, IPSL and Université Paris-Saclay, 91191 Gif-sur-Yvette, France
  • 4Magdeburg-Stendal University of Applied Sciences, Department of Water, Environment, Construction and Safety, Magdeburg, Germany
  • 5Aix Marseille Université, Université de Toulon, CNRS, CPT, 13009 Marseille, France
  • 6Università della Calabria, Dipartimento di Fisica, Rende (CS), Italy

The solar wind is characterized by a multiscale dynamics showing features of chaos, turbulence, intermittency, and recurring large-scale patterns, pointing towards the existence of an underlying attractor. However, magnetic field and plasma parameters usually show different scaling regimes with different physical and dynamical properties. Here by using a recent and novel approach developed in the framework of dynamical systems  we investigate the multiscale instantaneous properties of solar wind magnetic field phase space by means of the evaluation of instantaneous dimension and stability. We show the existence of a break in the average attractor dimension occurring at the observed scaling break between the inertial and the dissipative regimes. We further show that sometimes the dynamics is higher dimensional (d>3) suggesting that the phase space is larger than that described by the system variables and invoking for an external forcing mechanism, together with the existence of at least one unstable fixed point that cannot be definitely associated with noise. Instantaneous properties of the attractor therefore provide an efficient way of evaluating dynamical properties and building up improved cascade models.

How to cite: Caby, T., Alberti, T., Faranda, D., Donner, R. V., Consolini, G., Vaienti, S., and Carbone, V.: Instantaneous multiscale properties of solar wind dynamical regimes and their attractors, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8342, https://doi.org/10.5194/egusphere-egu21-8342, 2021.

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