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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2012 > Séminaires 2012 > Le jeudi 22 mars à 14h

Le jeudi 22 mars à 14h

Enrico CAMPOREALE (Queen Mary College, London)

"Simulations of turbulent relaxation in solar wind plasma and the role of reconnection"

à Palaiseau, salle de réunion du LIX

We present results from two-dimensional fully-kinetic Particle-in-Cell (PIC) simulations of decaying electromagnetic
fluctuations. The computational box is such that wavelengths ranging from electron to ion gyroradii are
resolved. The parameters used are realistic for the solar wind, and the ion to electron mass ratio is physical. The
simulations study the regime of cascade from scales from close to the ion scale to electron scales.We firstly analyse
the simulation results in the light of the Vlasov linear theory. The dispersion curves of lightly damped modes in
this regime suggest that a linear mechanism could be responsible for the observed steepening of power spectra at
electron scales, but a straightforward identification of turbulent fluctuations as an ensemble of linear modes is not
possible. In contrast to dissipation mechanisms based on linear modes, magnetic reconnection offers a different
route to particle heating and energization at small scales. We show that reconnection events do occur during the
simulations of turbulent relaxation, and we illustrate the signatures of electron heating for these events. We also
investigate the role of controlling parameters for the effectiveness of reconnection in the dissipation process.


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)