The Turbulent Cascade for High Cross-Helicity States at 1 AU

Details The Turbulent Cascade for High Cross-Helicity States at 1 AU The Turbulent Cascade for High Cross-Helicity States at 1 AU

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...713..920s&link_type=abstract

The Astrophysical Journal, Volume 713, Issue 2, pp. 920-934 (2010).

Astronomy and Astrophysics

Astronomy

6

Magnetohydrodynamics: Mhd, Solar Wind, Turbulence

Scientific paper

We apply third-moment theory that describes the energy cascade within the inertial range of magnetohydrodynamic turbulence to observations of large cross-helicity states at 1 AU. We find that in contrast to intervals with smaller helicity that form the bulk of the observations, large helicity states demonstrate a significant back-transfer of energy from small to large scales. This occurs in such a manner as to reinforce the dominance of the outward-propagating fluctuations. We find no evidence of a significant anisotropy in the back-transfer dynamics and conclude that the process must be short-lived in order to be consistent with solar wind observations. We offer this as partial explanation for large helicity states in the solar wind.

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