Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...721l..10m&link_type=abstract
The Astrophysical Journal Letters, Volume 721, Issue 1, pp. L10-L13 (2010).
Astronomy and Astrophysics
Astronomy
3
Interplanetary Medium, Magnetic Fields, Solar Wind, Turbulence
Scientific paper
A method is devised for estimating the two-time correlation function and the associated Eulerian decorrelation timescale in turbulence. With the assumptions of a single decorrelation time and a frozen-in flow approximation for the single-point analysis, the method compares two-point correlation measurements with single-point correlation measurements at the corresponding spatial lag. This method is applied to interplanetary magnetic field measurements from the Advanced Composition Explorer and Wind spacecraft. An average Eulerian decorrelation time of 2.9 hr is found. This measures the total rate of distortion of turbulent fluid elements—including sweeping, nonlinear distortion, and wave propagation.
Dasso Sergio
Galland Kivelson Margaret
Matthaeus William H.
Osman Kareem T.
Weygand James M.
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