EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Parametric instability in the expanding solar wind

Andrea Verdini1, Roland Grappin2, Francesco Malara3, Leonardo Primavera3, and Luca Del Zanna1
Andrea Verdini et al.
  • 1Dipartimento di Fisica e Astronomia, Università di Firenze, Sesto Fiorentino, Italy
  • 2LPP, Ecole Polytechnique, Palaiseau, France
  • 3Dipartimento di Fisica, Università della Calabria, Dipartimento di Fisica, Rende, Italy

Recent measurments of Parker Solar Probe show that alfvenic fluctuations in the solar wind often appear in the form of swithcback with constant total magnetic field. Our aim is to understand if and how such fluctuations can contribute to the heating or acceleration of the solar wind, via the Parametric Instability. The intability of one dimensional Alfvénic fluctuations has been extensively studied in both homogenoeus plasma and in the expanding solar wind, less so for the two-dimensional case which is closer to expected three-dimensional nature of switchbacks. In this work we study under which condition an Alfvén wave with a two dimensional spectrum (as introduced in Primavera et al ApJ 2019) can decay in the expanding solar wind and we will present preliminary results.

How to cite: Verdini, A., Grappin, R., Malara, F., Primavera, L., and Del Zanna, L.: Parametric instability in the expanding solar wind, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15590,, 2021.

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