Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence
Abstract
Here, this article presents a calculation of the mean electromotive force arising from general smallscale magnetohydrodynamical turbulence, within the framework of the secondorder correlation approximation. With the goal of improving understanding of the accretion disk dynamo, effects arising through smallscale magnetic fluctuations, velocity gradients, density and turbulence stratification, and rotation, are included. The primary result, which supplements numerical findings, is that an offdiagonal turbulent resistivity due to magnetic fluctuations can produce largescale dynamo actionthe magnetic analog of the "shearcurrent" effect. In addition, consideration of alpha effects in the stratified regions of disks gives the puzzling result that there is no strong prediction for a sign of alpha, since the effects due to kinetic and magnetic fluctuations, as well as those due to shear and rotation, are each of opposing signs and tend to cancel each other.
 Authors:

 Princeton Univ., Princeton, NJ (United States)
 Publication Date:
 Research Org.:
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1256591
 Alternate Identifier(s):
 OSTI ID: 1224869
 Report Number(s):
 PPPL5183
Journal ID: ISSN 15393755; PLEEE8
 Grant/Contract Number:
 AC0209CH11466; AC0209CH11466
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
 Additional Journal Information:
 Journal Volume: 92; Journal Issue: 5; Journal ID: ISSN 15393755
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Squire, J., and Bhattacharjee, A. Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence. United States: N. p., 2015.
Web. doi:10.1103/PhysRevE.92.053101.
Squire, J., & Bhattacharjee, A. Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence. United States. doi:10.1103/PhysRevE.92.053101.
Squire, J., and Bhattacharjee, A. Mon .
"Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence". United States. doi:10.1103/PhysRevE.92.053101. https://www.osti.gov/servlets/purl/1256591.
@article{osti_1256591,
title = {Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence},
author = {Squire, J. and Bhattacharjee, A.},
abstractNote = {Here, this article presents a calculation of the mean electromotive force arising from general smallscale magnetohydrodynamical turbulence, within the framework of the secondorder correlation approximation. With the goal of improving understanding of the accretion disk dynamo, effects arising through smallscale magnetic fluctuations, velocity gradients, density and turbulence stratification, and rotation, are included. The primary result, which supplements numerical findings, is that an offdiagonal turbulent resistivity due to magnetic fluctuations can produce largescale dynamo actionthe magnetic analog of the "shearcurrent" effect. In addition, consideration of alpha effects in the stratified regions of disks gives the puzzling result that there is no strong prediction for a sign of alpha, since the effects due to kinetic and magnetic fluctuations, as well as those due to shear and rotation, are each of opposing signs and tend to cancel each other.},
doi = {10.1103/PhysRevE.92.053101},
journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics},
number = 5,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}
Web of Science
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