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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2016 > Séminaires 2016 > Le jeudi 3 Novembre à 11h

Le jeudi 3 Novembre à 11h

Daniel Gomez, Instituto de Astronomia y Fisica del Espacio and Department of Physics, University of Buenos Aires, Argentina

Titre : Turbulence and magnetic reconnection in two-fluid plasmas
Quand : jeudi 3 Novembre, 11h
Lieu : salle du CPhT Aile 0 à Palaiseau (en visio conference à Jussieu, Tour 24-34, 5eme étage).

Résumé :
In space plasmas, turbulence and magnetic reconnection are ubiquitous physical processes that have been traditionally studied using a one-fluid resistive MHD description.

Within the theoretical framework of the two-fluid model, we retain the effects of the Hall current and electron inertia. This general fluid description brings into play two new spatial scales, such as the ion and electron inertial lengths. We perform numerical simulations of the two-fluid equations and study the physical processes arising at sub-ion and even at electron scales both for turbulence and for magnetic reconnection.
When a stationary turbulent regime is established, our simulations show changes in the slope of the energy power spectrum at the ion and electron inertial lengths, in agreement with the slopes obtained using dimensional analysis. Using non-dissipative two-fluid simulations, we confirm that magnetic reconnection arises only when the effects of electron inertia are retained. In a stationary regime, we obtain that the reconnection rate is proportional to the ion inertial length, as also emerges from a scaling law derived from dimensional arguments.


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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)