Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 466, Issue 4, Pages 3918-3927Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw3251
Keywords
MHD; turbulence; solar wind
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Funding
- National Aeronautics and Space Administration (NASA) [NNX15AI80G]
- National Science Foundation (NSF) [PHY-1500041, AGS-1258998, AGS-1624501]
- UK Science and Technologies Facilities Council (STFC)
- Engineering & Physical Sciences Research Council (EPSRC)
- US NSF Grant [ACI-1053575]
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We propose a simple statistical model of three-dimensionally anisotropic, intermittent, strong Alfvenic turbulence, incorporating both critical balance and dynamic alignment. Our model is based on log-Poisson statistics for Elsasser-field increments along the magnetic field. We predict the scalings of Elsasser-field conditional two-point structure functions with point separations in all three directions in a coordinate system locally aligned with the direction of the magnetic field and of the fluctuating fields and obtain good agreement with numerical simulations. We also derive a scaling of the parallel coherence scale of the fluctuations, l(parallel to) proportional to lambda(1/2), where lambda is the perpendicular scale. This is indeed observed for the bulk of the fluctuations in numerical simulations.
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