INVESTIGADORES
MININNI Pablo Daniel
congresos y reuniones científicas
Título:
Beyond MHD: Hall-MHD turbulence and dynamo action
Autor/es:
P.D. MININNI
Lugar:
Philadelphia, Estados Unidos
Reunión:
Congreso; 48th Annual Meeting of the Division of Plasma Physics, American Physical Society; 2006
Institución organizadora:
APS
Resumen:
The relevance of two fluid effects has recently been pointed out
in several studies of astrophysical and laboratory plasmas. The
effect of adding the Hall current to the dynamics of the flow was
studied in several scenarios, particularly dynamo action and
reconnection. Some of the works in Hall-magnetohydrodynamics
(Hall-MHD) present conflicting results, indicating in some cases
that the Hall effect can help the growth of a large scale
magnetic field or a large scale self-organization process, while
in other cases the Hall currents were observed to generate small
scales and filamentation. In this talk we will discuss both
analytically and numerically three dimensional Hall-MHD
turbulence as the result of a dynamo. The dynamo process,
believed to be responsible for sustaining the magnetic fields
observed in several astrophysical objects, is an example in which
the small scale fluctuations can have an impact in the evolution
of the fields in the largest scales in the system. The inclusion
of the Hall effect in the small scales allows for novel
interactions between separated scales dominated by MHD or by two
fluid effects.