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

Authors
Greco, Andres Francisco; Matthaeus, W. H.; D'Amicis, R.; Servidio, S.; Dmitruk, Pablo Ariel
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: Greco, Andres Francisco. Universita Della Calabria; Italia
Fil: Matthaeus, W. H.. Bartol Research Institute; Estados Unidos
Fil: D'Amicis, R.. Istituto Di Fisica Dello Spazio Interplanetario; Italia
Fil: Servidio, S.. Universita Della Calabria; Italia
Fil: Dmitruk, Pablo Ariel. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
Subject
MAGNETOHYDRODYNAMICS (MHD)
SOLAR WIND
TURBULENCE
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Open access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/56781