Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...749..105g&link_type=abstract
The Astrophysical Journal, Volume 749, Issue 2, article id. 105 (2012).
Astronomy and Astrophysics
Astronomy
Magnetohydrodynamics: Mhd, Solar Wind, Turbulence
Scientific paper
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.
D'Amicis Raffaella
Dmitruk Pablo
Greco Andrés
Matthaeus William H.
Servidio Sergio
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