Hnat, B., Chapman, Sandra C., Rowlands, G. (George), Watkins, Nicholas W. and Freeman, M. P. (Mervyn P.) (2002) Scaling of solar wind e and the AU, AL and AE indices as seen by WIND. Geophysical Research Letters, Vol.29 (No.22). doi:10.1029/2002GL016054

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Abstract

We apply the finite size scaling technique to quantify the statistical properties of fluctuations in AU, AL and AE indices and in the parameter that represents energy input from the solar wind into the magnetosphere. We find that the exponents needed to rescale the probability density functions (PDF) of the fluctuations are the same to within experimental error for all four quantities. This self-similarity persists for time scales up to ~4 hours for AU, AL and and up to ~2 hours for AE. Fluctuations on shorter time scales than these are found to have similar long-tailed (leptokurtic) PDF, consistent with an underlying turbulent process. These quantitative and model-independent results place important constraints on models for the coupled solar wind-magnetosphere system.

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, Magnetosphere, Geomagnetic indexes
Journal or Publication Title:	Geophysical Research Letters
Publisher:	American Geophysical Union
ISSN:	0094-8276
Official Date:	2002
Dates:	Date Event 2002 Published
Volume:	Vol.29
Number:	No.22
DOI:	10.1029/2002GL016054
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)

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