Evidence for nonlinear development of magnetohydrodynamic scale intermittency in the inner heliosphere

Authors
Greco, A.; Matthaeus, W.H.; D'Amicis, R.; Servidio, S.; <div class="autor_fcen" id="2615">Dmitruk, P.</div>
Publication Year
2012
Language
English
Format
article
Status
Published version
Description
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. © 2012. The American Astronomical Society. All rights reserved.
Fil:Dmitruk, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Source
Astrophys. J. 2012;749(2)
Subject
magnetohydrodynamics (MHD)
solar wind
turbulence
Access level
Open access
License
http://creativecommons.org/licenses/by/2.5/ar
Repository
Biblioteca Digital (UBA-FCEN)
Institution
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identifier
snrd:HASH662214aca47f24b738236c