Artículos de revistas
Evidence for nonlinear development of magnetohydrodynamic scale intermittency in the inner heliosphere
Fecha
2012-04Registro en:
Greco, Andres Francisco; Matthaeus, W. H.; D'Amicis, R.; Servidio, S.; Dmitruk, Pablo Ariel; Evidence for nonlinear development of magnetohydrodynamic scale intermittency in the inner heliosphere; IOP Publishing; Astrophysical Journal; 749; 2; 4-2012; 105-112
0004-637X
CONICET Digital
CONICET
Autor
Greco, Andres Francisco
Matthaeus, W. H.
D'Amicis, R.
Servidio, S.
Dmitruk, Pablo Ariel
Resumen
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.