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Title: Alpha effect in partially ionized plasmas
Authors: Krishan, V
Gangadhara, R. T
Keywords: Astrophysical Turbulence;Pulsars;Dynamos;Solar and Space Plasmas;Ionized Plasmas;Partially Ionized Plasmas;Alpha Effect
Issue Date: 2008
Publisher: Springer Netherlands
Citation: Hasan, S. S., Gangadhara, R. T. and Krishan, V. eds., Turbulence, dynamos, accretion disks, pulsars and collective plasma processes, First Kodai-Trieste workshop on plasma astrophysics held at the Kodaikanal Observatory., Astrophysics and space science proceedings., Kodaikanal., India, 2007., pp. 55 - 68
Abstract: There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma the magnetic induction is subjected to the ambipolar diffusion and the Hall effect in addition to the usual resistive dissipation. In this paper we initiate the study of the kinematic dynamo in a partially ionized turbulent plasma. The Hall effect arises from the treatment of the electrons and the ions as two separate fluids and the ambipolar diffusion due to the inclusion of neutrals as the third fluid. It is shown that these nonideal effects modify the so called α effect and the turbulent diffusion coefficient β in a rather substantial way. The Hall effect may enhance or quench the dynamo action altogether. The ambipolar diffusion brings in an α which depends on the mean magnetic field. The new correlations embodying the coupling of the charged fluids and the neutral fluid appear in a decisive manner. The turbulence is necessarily magnetohydrodynamic with new spatial and time scales. The nature of the new correlations is demonstrated by taking the Alfvénic turbulence as an example.
Description: Restricted Access
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ISBN: 978-1-4020-8867-4
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Appears in Collections:IIAP Publications

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