Generación de campos magnéticos en astrofísica en presencia de efecto Hall

P.D. MININNI, D.O. GÓMEZ, Y S.M. MAHAJAN

Buenos Aires, Argentina

Congreso; 45 Reunión anual de la Asociación Argentina de Astronomía; 2002

Asociación Argentina de Astronomía

Magnetic field generation in astrophysical environments has been historically described within the framework of dynamo activity in magnetohydrodynamics. However, this canonical framework is not applicable in objects where kinetic effects, such as the Hall effect, are relevant. Some of the astrophysical systems where the Hall effect might be important are: turbulence in the early universe, white dwarfs, neutron stars, and accretion discs (specially in protostellar discs). In the present work, we present theoretical results and numerical simulations showing that the Hall currents have a profound effect on turbulent dynamo action. The results are compared with the classical dynamo theory. Depending on the stenght of the Hall effect the generation of magnetic energy can strongly increase or decrease, reaching values much larger than those obtained in magnetohydrodynamic turbulent dynamos.