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.
EVIDENCE FOR NONLINEAR DEVELOPMENT OF MAGNETOHYDRODYNAMIC SCALE INTERMITTENCY IN THE INNER HELIOSPHERE / Greco, Antonella; Matthaeus, Wh; D'Amicis, R; Servidio, Sergio; Dmitruk, P.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 749(2012), pp. 1-9.
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Titolo: | EVIDENCE FOR NONLINEAR DEVELOPMENT OF MAGNETOHYDRODYNAMIC SCALE INTERMITTENCY IN THE INNER HELIOSPHERE |
Autori: | |
Data di pubblicazione: | 2012 |
Rivista: | |
Citazione: | EVIDENCE FOR NONLINEAR DEVELOPMENT OF MAGNETOHYDRODYNAMIC SCALE INTERMITTENCY IN THE INNER HELIOSPHERE / Greco, Antonella; Matthaeus, Wh; D'Amicis, R; Servidio, Sergio; Dmitruk, P.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 749(2012), pp. 1-9. |
Handle: | http://hdl.handle.net/20.500.11770/136068 |
Appare nelle tipologie: | 1.1 Articolo in rivista |