期刊
ASTROPHYSICAL JOURNAL
卷 749, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/749/2/105
关键词
magnetohydrodynamics (MHD); solar wind; turbulence
资金
- NASA [NNX08AI47G]
- NSF SHINE [ATM-0752135]
- Solar Probe ISIS Theory and Modeling project
- Marie Curie Project [PIRSES-2010-269297-Turboplasmas]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1063439] Funding Source: National Science Foundation
The formation of coherent structures in turbulence is a signature of a developing cascade and therefore might be observable by analyzing inner heliospheric solar wind turbulence. To test this idea, data from the Helios 2 mission, for six streams of solar wind at different heliocentric distances and of different velocities, were subjected to statistical analysis using the partial variance of increments (PVI) approach. We see a clear increase of the PVI distribution function versus solar wind age for higher PVI cutoff, indicating development of non-Gaussian coherent structures. The plausibility of this interpretation is confirmed by a similar behavior observed in two-dimensional magnetohydrodynamics simulation data at corresponding dimensionless nonlinear times.
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