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Observation of universality in the generalized similarity of evolving solar wind turbulence as seen by ULYSSES

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Chapman, Sandra C., Nicol, R. M., Leonardis, E., Kiyani, K. and Carbone, V. (2009) Observation of universality in the generalized similarity of evolving solar wind turbulence as seen by ULYSSES. Astrophysical Journal Letters, Vol.695 (No.2). L185-L188. doi:10.1088/0004-637X/695/2/L185 ISSN 2041-8213.

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Official URL: http://dx.doi.org/10.1088/0004-637X/695/2/L185

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Abstract

We perform statistical analysis of the fluctuating magnetic field observed in-situ by the Ulysses spacecraft, from the perspective of quantitative characterization of the evolving magnetohydrodynamic (MHD) turbulence. We focus on two successive polar passes around solar minimum which provide extended intervals of quiet, fast solar wind at a range of radial distances and latitudes: the south polar pass of 1994 and the north polar pass of 1995. Fully developed inertial range turbulence has a characteristic statistical similarity property of quantities that characterize the flow, such as the magnetic field components Bk(t), so that the pth moment of fluctuations has power-law dependence on scale t such that < |Bk(t + tau) - Bk( t)|(p) >similar to tau(zeta(p)). We instead find a generalized similarity < |Bk( t + tau) - Bk(t)|(p) >similar to g(tau/tau(0))(zeta(p)) consistent with extended self-similarity; and in particular all of these Ulysses observations, from both polar passes, share the same single function g(tau/tau(0)). If these observations are indeed characteristic of MHD turbulence evolving in-situ, then this quantifies for the first time a key aspect of the universal nature of evolving MHD turbulence in a system of finite size, with implications both for theoretical development, and for our understanding of the evolving solar wind.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Solar wind, Plasma (Ionized gases), Plasma turbulence, Magnetohydrodynamics
Journal or Publication Title: Astrophysical Journal Letters
Publisher: IOP Publishing Ltd
ISSN: 2041-8213
Official Date: 20 April 2009
Dates:
DateEvent
20 April 2009Published
Volume: Vol.695
Number: No.2
Number of Pages: 4
Page Range: L185-L188
DOI: 10.1088/0004-637X/695/2/L185
Status: Peer Reviewed
Publication Status: Published
Funder: Science and Technology Facilities Council (Great Britain) (STFC), Engineering and Physical Sciences Research Council (EPSRC), British Council

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