Role of cross helicity in magnetohydrodynamic turbulence

Details Role of cross helicity in magnetohydrodynamic turbulence Role of cross helicity in magnetohydrodynamic turbulence

2008-07-16

arxiv.org/abs/0807.2635v2

Physical Review Letters, 102, 025003 (2009)

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.025003

Strong incompressible three-dimensional magnetohydrodynamic turbulence is investigated by means of high resolution direct numerical simulations. The simulations show that the configuration space is characterized by regions of positive and negative cross-helicity, corresponding to highly aligned or anti-aligned velocity and magnetic field fluctuations, even when the average cross-helicity is zero. To elucidate the role of cross-helicity, the spectra and structure of turbulence are obtained in imbalanced regions where cross-helicity is non-zero. When averaged over regions of positive and negative cross-helicity, the result is consistent with the simulations of balanced turbulence. An analytical explanation for the obtained results is proposed.

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