2D Partially-Ionized Magnetohydrodynamic Turbulence: probing the interior of Gas Giant Planet Atmospheres

Data: 
11/07/2018 - 14:00 - 15:00
Local: 
Auditório 2

 

2D Partially-Ionized Magnetohydrodynamic Turbulence: probing the interior of Gas Giant Planet Atmospheres
 
 
Santiago Benavides
MIT
 
 
Ionization occurs in the upper atmospheres of Hot Jupiters, as well as the interiors of Gas Giant Planets, leading to Magnetohydrodynamic (MHD) effects which couple the momentum and the magnetic field and can thereby significantly alter the dynamics. The interactions of these MHD regions with the non-ionized atmosphere will occur in transition regions (also called ``semi-conducting'' regions) where only a fraction of the fluid is ionized. To explore the dynamics of the semi-conducting regions we utilize Partially-Ionized MHD (PIMHD), a two-fluid model -- one neutral and one ionized and subject to MHD -- coupled by a collision, or Joule heating, term proportional to the difference in velocities. We examine the parameter space of 2D PIMHD turbulence in hopes of better understanding its characteristics in certain, possibly realistic, regimes. We pay particular attention to the collisional heating term and its role in dissipation and energy exchange between the two species. This knowledge will serve as the basis to further studies in which we look at, in a more realistic setting, the PIMHD dynamics in Gas Giant Planets or Hot Jupiter atmospheres.
 
 
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