Journal
ASTROPHYSICAL JOURNAL
Volume 713, Issue 2, Pages 920-934Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/713/2/920
Keywords
magnetohydrodynamics (MHD); solar wind; turbulence
Categories
Funding
- Caltech [44A1085631]
- NASA [NNX08AJ19G, NNX09AG28G]
- NSF SHINE [ATM0850705]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0850705] Funding Source: National Science Foundation
- NASA [118539, NNX09AG28G, 100198, NNX08AJ19G] Funding Source: Federal RePORTER
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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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