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Synthesis of Small and Large Scale Dynamos

Published online by Cambridge University Press:  30 March 2016

Kandaswamy Subramanian
Kandaswamy Subramanian*
Affiliation:
National Centre for Radio Astrophysics, TIFR, Poona University Campus, Ganeshkhind, Pune 411 007, India

Abstract

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Using a closure model for the evolution of magnetic correlations, we uncover an interesting plausible saturated state of the small-scale fluctuation dynamo (SSD) and a novel anology between quantum mechanical tunnelling and the generation of large-scale fields. Large scale fields develop via the α-effect, but as magnetic helicity can only change on a resistive timescale, the time it takes to organize the field into large scales increases with magnetic Reynolds number. This is very similar to the results which obtain from simulations using the full MHD equations.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 12: Highlights of Astronomy. As presented at the XXIVth General Assembly of the IAU, 2000 , 2002 , pp. 739 - 741
Copyright
Copyright © Astronomical Society of Pacific 2002

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