Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-05-20
Astrophys.J.701:652-657,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
16 pages, 2 figures, accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/701/1/652
Different results for the cascade power in strong, incompressible MHD turbulence with nonzero cross helicity appear in the literature. In this paper, we discuss the conditions under which these different results are valid. We define z+ to be the rms amplitude of Alfven waves propagating parallel to the background magnetic field, and z- to be the rms amplitude of Alfven waves propagating anti-parallel to the background magnetic field. Nonzero cross helicity implies that z+ and z- differ, and we take z- to be less than z+. We find that the mechanism that generates the z- fluctuations strongly affects the cascade power, because it controls the coherence time for interactions between oppositely directed wave packets at the outer scale. In particular, for fixed values of z+ and z-, the cascade power is in many cases larger when the z- fluctuations are generated by the reflection of z+ fluctuations than when the z- fluctuations are generated by forcing that is only weakly correlated with the z+ fluctuations.
Chandran Benjamin D. G.
Dorland William
Hollweg Joseph V.
Howes Gregory G.
Quataert Eliot
No associations
LandOfFree
The Turbulent Heating Rate in Strong MHD Turbulence with Nonzero Cross Helicity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Turbulent Heating Rate in Strong MHD Turbulence with Nonzero Cross Helicity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Turbulent Heating Rate in Strong MHD Turbulence with Nonzero Cross Helicity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-444238