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Title: Theory of incompressible MHD turbulence with scale-dependent alignment, anisotropy, and cross-helicity

Abstract

A theory of incompressible MHD turbulence with nonvanishing cross-helicity is derived based on two new observations from the Wind spacecraft. The first is the observation that the normalized cross-helicity {sigma}{sub c} is approximately scale-invariant throughout the inertial range. The second is the observation that the probablities p and q for velocity and magnetic field fluctuations to be positively or negatively aligned are also approximately scale-invariant. The theory extends the theory of Boldyrev (2006) to turbulence with nonvanishing cross-helicity assuming that the cascades of the two Elsasser energies are both in a state of critical balance.

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
970029
Report Number(s):
LA-UR-09-05884; LA-UR-09-5884
TRN: US1000720
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article
Journal Name:
American Institute of Physics
Additional Journal Information:
Journal Name: American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
70; 71; ALIGNMENT; ANISOTROPY; FLUCTUATIONS; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; SOLAR WIND; TURBULENCE; VELOCITY

Citation Formats

Podesta, John J. Theory of incompressible MHD turbulence with scale-dependent alignment, anisotropy, and cross-helicity. United States: N. p., 2009. Web.
Podesta, John J. Theory of incompressible MHD turbulence with scale-dependent alignment, anisotropy, and cross-helicity. United States.
Podesta, John J. Thu . "Theory of incompressible MHD turbulence with scale-dependent alignment, anisotropy, and cross-helicity". United States. https://www.osti.gov/servlets/purl/970029.
@article{osti_970029,
title = {Theory of incompressible MHD turbulence with scale-dependent alignment, anisotropy, and cross-helicity},
author = {Podesta, John J},
abstractNote = {A theory of incompressible MHD turbulence with nonvanishing cross-helicity is derived based on two new observations from the Wind spacecraft. The first is the observation that the normalized cross-helicity {sigma}{sub c} is approximately scale-invariant throughout the inertial range. The second is the observation that the probablities p and q for velocity and magnetic field fluctuations to be positively or negatively aligned are also approximately scale-invariant. The theory extends the theory of Boldyrev (2006) to turbulence with nonvanishing cross-helicity assuming that the cascades of the two Elsasser energies are both in a state of critical balance.},
doi = {},
url = {https://www.osti.gov/biblio/970029}, journal = {American Institute of Physics},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {1}
}