Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0905.3382)
· References in the article
· Citations to the Article (4) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The Turbulent Heating Rate in Strong Magnetohydrodynamic Turbulence with Nonzero Cross Helicity
Authors:
Chandran, Benjamin D. G.; Quataert, Eliot; Howes, Gregory G.; Hollweg, Joseph V.; Dorland, William
Affiliation:
AA(Space Science Center and Department of Physics, University of New Hampshire, NH, USA ), AB(Department of Astronomy, University of California, Berkeley, CA, USA ), AC(Department of Physics & Astronomy, University of Iowa, IA, USA ), AD(Space Science Center and Department of Physics, University of New Hampshire, NH, USA ), AE(Department of Physics, University of Maryland, MD, USA )
Publication:
The Astrophysical Journal, Volume 701, Issue 1, pp. 652-657 (2009). (ApJ Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
magnetic fields, MHD, solar wind, Sun: corona, Sun: flares, turbulence
DOI:
10.1088/0004-637X/701/1/652
Bibliographic Code:
2009ApJ...701..652C

Abstract

Different results for the cascade power epsilon in strong, incompressible magnetohydrodynamic turbulence with nonzero cross helicity appear in the literature. In this paper, we discuss the conditions under which these different results are valid. Our conclusions can be expressed in terms of the density ρ, the rms amplitudes z + and z - of Alfvénic fluctuations propagating parallel and antiparallel to the background magnetic field B 0, and the correlation length (outer scale) measured perpendicular to B 0, denoted L bottom. We argue that if z + Gt z - and if the z - fluctuations are sustained by the reflection of z + fluctuations in a strong background magnetic field, then epsilon ~ ρ(z +)2 z -/L bottom as in previous studies by Hossain, Matthaeus, Dmitruk, Lithwick, Goldreich, Sridhar, and others. On the other hand, if the minority wave type (z -) is sustained by some form of forcing that is uncorrelated with or only weakly correlated with the z + fluctuations, then epsilon can be much less than ρ(z +)2 z -/L bottom, as in previous studies by Dobrowolny, Lazarian, Chandran, and others. The mechanism for generating the minority wave type strongly affects the cascade power because it controls the coherence time for interactions between oppositely directed wave packets at the outer scale.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints