Publication: Spectral properties and length scales of two-dimensional magnetic field models
2
Issued Date
2007-01-01
Resource Type
ISSN
15384357
0004637X
0004637X
DOI
Other identifier(s)
2-s2.0-35348897137
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Mahidol University
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SCOPUS
Bibliographic Citation
Astrophysical Journal. Vol.667, No.2 I (2007), 956-962
Suggested Citation
W. H. Matthaeus, J. W. Bieber, D. Ruffolo, P. Chuychai, J. Minnie Spectral properties and length scales of two-dimensional magnetic field models. Astrophysical Journal. Vol.667, No.2 I (2007), 956-962. doi:10.1086/520924 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/24426
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Title
Spectral properties and length scales of two-dimensional magnetic field models
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Abstract
Two-dimensional (2D) models of magnetic field fluctuations and turbulence are widely used in space, astrophysical, and laboratory contexts. Here we discuss some general properties of such models and their observable power spectra. While the field line random walk in a one-dimensional (slab) model is determined by the correlation scale, for 2D models, it is characterized by a different length scale, the ultrascale. We discuss properties of correlation scales and ultrascales for 2D models and present a technique for determining an ultrascale from observations at a single spacecraft, demonstrating its accuracy for synthetic data. We also categorize how the form of the low-wavenumber spectrum affects the correlation scales and ultrascales, thus controlling the diffusion of magnetic field lines and charged test particle motion. © 2007. The American Astronomical Society. All rights reserved.