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Parametric Instability of a Broad-band Alfvén Wave: Nonlinear Evolution and Saturation

Published online by Cambridge University Press:  13 May 2016

F. Malara ,
L. Primavera  and
P. Veltri
F. Malara
Affiliation:
Dipartimento di Fisica, Università della Calabria, via P. Bucci, 87036 Rende (CS), Italy Istituto Nazionale per la Fisica della Materia, Unità di Cosenza, via P. Bucci, 87036 Rende (CS), Italy
L. Primavera
Affiliation:
Dipartimento di Fisica, Università della Calabria, via P. Bucci, 87036 Rende (CS), Italy Istituto Nazionale per la Fisica della Materia, Unità di Cosenza, via P. Bucci, 87036 Rende (CS), Italy
P. Veltri
Affiliation:
Dipartimento di Fisica, Università della Calabria, via P. Bucci, 87036 Rende (CS), Italy Istituto Nazionale per la Fisica della Materia, Unità di Cosenza, via P. Bucci, 87036 Rende (CS), Italy

Abstract

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The nonlinear evolution of parametric instability of a non-monocrhomatic Alfvén wave is studied using numerical simulations. After a linear stage the instability saturates. For β ~ 1 the initial mode remains dominant, except at large scales, where an inverse cascade of backscattered Alfvénic modes is present. A comparison with solar wind data gives a qualitative agreement, indicating that parametric instability could play an important role in the evolution of solar wind turbulence.

Type
Session V: Coronal Heating and Solar Wind Acceleration
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 511 - 513
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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