Non-local mean field dynamo theory and magnetic fronts in galaxies / Fedotov S,Ivanov A,Zubarev A // GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS. - 2003. - V. 97, l. 2. - P. 135-148.

ISSN/EISSN:

0309-1929 / нет данных

Type:

Article

Abstract:

In this article we address the problem of magnetic field generation and front propagation in turbulent electrically conducting fluids, involving the velocity with finite correlations times and small magnetic diffusivity. We suggest an integro-differential dynamo equation which involves the non-local terms for both the dynamo source a-term and turbulent transport of the mean magnetic field. We derive a set of formulas which allows us to determine the rate of magnetic front propagation in galaxies valid for arbitrary memory kernels. We illustrate the general results through the use of the exponential correlation functions for memory kernels and `no-z' approximation. We find that the memory effects have strong influence on for both the growth rate and propagation speed. We perform numerical simulations of exterior front speed, and find that the transport memory essentially decreases the propagation rate.

Author keywords:

memory effects; dynamo; front propagation SPIRAL GALAXIES; PROPAGATION; SYSTEMS

DOI:

10.1080/0309192031000108715

Web of Science ID:

ISI:000184124800003

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	TAYLOR \& FRANCIS LTD
Address	4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND
Language	English
Keywords-Plus	SPIRAL GALAXIES; PROPAGATION; SYSTEMS
Research-Areas	Astronomy \& Astrophysics; Geochemistry \& Geophysics; Mechanics
Web-of-Science-Categories	Astronomy \& Astrophysics; Geochemistry \& Geophysics; Mechanics
ResearcherID-Numbers	Zubarev, Adrey/B-4752-2014 Fedotov, Sergei/H-5880-2012 Ivanov, Alexey/E-4442-2011
ORCID-Numbers	Ivanov, Alexey/0000-0001-8239-4039
Number-of-Cited-References	18
Usage-Count-Since-2013	1
Journal-ISO	Geophys. Astrophys. Fluid Dyn.
Doc-Delivery-Number	700RK