[Todos] Coloquios del Departamento de Física (extra, hoy viernes 30/9, 11hs)

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Recordamos el coloquio de hoy,

                                              COLOQUIO EXTRA
                                     
                                      Viernes 30/9,  11hs, Aula Federman

                 Negative effective magnetic pressure instability in
turbulence simulations

                                                AXEL BRANDENBURG

                                                NORDITA, Suecia

   We present the first numerical demonstration of the negative effective
   magnetic pressure instability in direct numerical simulations of
   stably-stratified, externally-forced, isothermal hydromagnetic
   turbulence. By the action of this instability, initially uniform
   horizontal magnetic field forms flux concentrations whose scale is
   large compared to the turbulent scale. We further show that the magnetic
   energy of these large-scale structures is only weakly dependent on
   the magnetic Reynolds number. Our results support earlier mean-field
   calculations and analytic work which identified this instability.
   Applications to the formation of active regions in the Sun are
   discussed.
    
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