Artículo
Technique for measuring and correcting the Taylor microscale
Chuychai, P.; Weygand, J. M.; Matthaeus, W. H.; Dasso, Sergio Ricardo
; Smith, C. W.; Kivelson, M. G.
Fecha de publicación:
06/2014
Editorial:
American Geophysical Union
Revista:
Journal Of Geophysical Research
ISSN:
0148-0227
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We discuss and develop methods to estimate and refine measurements of the Taylor microscale from discrete data sets. To study how well a method works, we construct a time series of discrete data with a known power spectrum and Taylor scale, but with various truncations of the resolution that eliminate higher frequencies in a controlled fashion. We compute the second-order structure function and correlation function, assuming that the unresolved dissipation range spectrum has various values of spectral index. A series of Taylor scale estimates are obtained from parabolic fits to subsets of the correlation function data, and these are extrapolated to the limit of zero separation. The error in this procedure, for finite time resolution sampling, depends on the spectral index in the dissipation range. When the spectral form is known, we can compute a correction factor that improves the estimate of the Taylor microscale value determined from the extrapolation method and band-limited data. Application of this technique to spacecraft observations of solar wind fluctuations is illustrated.
Palabras clave:
Turbulence
,
Magnetohydrodynamics
,
Taylor Microscale
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Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Chuychai, P.; Weygand, J. M.; Matthaeus, W. H.; Dasso, Sergio Ricardo; Smith, C. W.; et al.; Technique for measuring and correcting the Taylor microscale; American Geophysical Union; Journal Of Geophysical Research; 119; 6; 6-2014; 4256-4265
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