Nicol, R. M., Chapman, Sandra C. and Dendy, R. O.. (2008) The signature of evolving turbulence in quiet solar wind as seen by Ulysses. Astrophysical Journal, Vol.679 (No.1). pp. 862-870. ISSN 0004-637X

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Abstract

Solar wind fluctuations, such as magnetic field or velocity, show power-law power spectra suggestive both of an inertial range of intermittent turbulence (with similar to-5/3 exponent), and at lower frequencies, of fluctuations of coronal origin (with similar to-1 exponent). The Ulysses spacecraft spent many months in the quiet fast solar wind above the Sun's polar coronal holes in a highly ordered magnetic field. We use statistical analysis methods such as the generalized structure function (GSF) and extended self- similarity (ESS) to quantify the scaling of the moments of the probability density function of fluctuations in the magnetic field. The GSFs give power law scaling in the f(-1) range of the form <vertical bar y(t + tau) - y(t)vertical bar(m)> similar to tau(zeta(m)), but ESS is required to reveal scaling in the inertial range, which is of the form <vertical bar y(t + tau) - y(t)vertical bar(m)> similar to[g(tau)](zeta(m)). We find that g(tau) is independent of spacecraft position and g(tau) similar to tau (-log)((lambda tau))(10). The f(-1) scaling fluctuates with radial spacecraft position. This confirms that, whereas the f(-1) fluctuations are directly influenced by the corona, the inertial range fluctuations are consistent with locally evolving turbulence, but with an envelope g(tau), which captures the formation of the quiet fast solar wind.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Magnetic fields, Solar wind, Turbulence
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Date:	20 May 2008
Volume:	Vol.679
Number:	No.1
Number of Pages:	9
Page Range:	pp. 862-870
Identification Number:	10.1086/586732
Status:	Peer Reviewed
Publication Status:	Published
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URI:	http://wrap.warwick.ac.uk/id/eprint/30085

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