Scaling in long term data sets of geomagnetic indices and solar wind epsilon as seen by WIND spacecraft

Hnat, B.; Chapman, S.C.; Rowlands, G.; Watkins, N.W.; Freeman, M.P.. 2003 Scaling in long term data sets of geomagnetic indices and solar wind epsilon as seen by WIND spacecraft. Geophysical Research Letters, 30 (22), 2174. 4. https://doi.org/10.1029/2003GL018209

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Abstract/Summary

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:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2003GL018209
Programmes:	BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Magnetic Reconnection, Substorms and their Consequences
ISSN:	0094-8276
Additional Information. Not used in RCUK Gateway to Research.:	Copyright American Geophysical Union
Date made live:	11 Apr 2012 12:44 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/17646

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