Characteristics of the Taylor microscale in the solar wind/foreshock: magnetic field and electron velocity measurements

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https://angeo.copernicus.org/articles/31/2063/2013/

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https://doi.org/10.5194/angeo-31-2063-2013
 http://hdl.handle.net/11603/30846

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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https://orcid.org/0000-0002-5317-988X

Date

2013-11-22

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journal articles
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Citation of Original Publication

Gurgiolo, C., M. L. Goldstein, W. H. Matthaeus, A. Viñas, and A. N. Fazakerley. “Characteristics of the Taylor Microscale in the Solar Wind/Foreshock: Magnetic Field and Electron Velocity Measurements.” Annales Geophysicae 31, no. 11 (November 22, 2013): 2063–75. https://doi.org/10.5194/angeo-31-2063-2013.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The Taylor microscale is one of the fundamental turbulence scales. Not easily estimated in the interplanetary medium employing single spacecraft data, it has generally been studied through two point correlations. In this paper we present an alternative, albeit mathematically equivalent, method for estimating the Taylor microscale (λT). We make two independent determinations employing multi-spacecraft data sets from the Cluster mission, one using magnetic field data and a second using electron velocity data. Our results using the magnetic field data set yields a scale length of 1538 ± 550 km, slightly less than, but within the same range as, values found in previous magnetic-field-based studies. During time periods where both magnetic field and electron velocity data can be used, the two values can be compared. Relative comparisons show λT computed from the velocity is often significantly smaller than that from the magnetic field data. Due to a lack of events where both measurements are available, the absolute λT based on the electron fluid velocity is not able to be determined.