Hnat, B., Chapman, Sandra C., Rowlands, G. (George), Watkins, Nicholas W. and Freeman, M. P. (Mervyn P.) (2003) Scaling in long term data sets of geomagnetic indices and solar wind ϵ as seen by WIND spacecraft. Geophysical Research Letters, Vol.30 (No.22). doi:10.1029/2003GL018209 ISSN 0094-8276.

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Abstract

We study scaling in fluctuations of the geomagnetic indices (AE, AU, and AL) that provide a measure of magnetospheric activity and of the ε parameter which is a measure of the solar wind driver. Generalized structure function (GSF) analysis shows that fluctuations exhibit self-similar scaling up to about 1 hour for the AU index and about 2 hours for AL, AE and ε when the most extreme fluctuations over 10 standard deviations are excluded. The scaling exponents of the GSF are found to be similar for the three AE indices, and to differ significantly from that of ε. This is corroborated by direct comparison of their rescaled probability density functions.

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, Geomagnetic indexes, Magnetosphere
Journal or Publication Title:	Geophysical Research Letters
Publisher:	American Geophysical Union
ISSN:	0094-8276
Official Date:	2003
Dates:	Date Event 2003 Published
Volume:	Vol.30
Number:	No.22
DOI:	10.1029/2003GL018209
Status:	Peer Reviewed
Access rights to Published version:	Open Access (Creative Commons)
Funder:	Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)

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