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Scaling of solar wind e and the AU, AL and AE indices as seen by WIND

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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). ISSN 0094-8276

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Official URL: http://dx.doi.org/10.1029/2002GL016054

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 > 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

Identification Number:

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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