March, T. K., Chapman, Sandra C. and Dendy, R. O.. (2005) Mutual information between geomagnetic indices and the solar wind as seen by WIND : implications for propagation time estimates. Geophysical Research Letters, Vol.32 . ISSN 0094-8276

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Abstract

The determination of delay times of solar wind conditions at the sunward libration point to effects on Earth is investigated using mutual information. This measures the amount of information shared between two timeseries. We consider the mutual information content of solar wind observations, from WIND, and the geomagnetic indices. The success of five commonly used schemes for estimating interplanetary propagation times is examined. Propagation assuming a fixed plane normal at 45 degrees to the GSE x-axis (i.e. the Parker Spiral estimate) is found to give optimal mutual information. The mutual information depends on the point in space chosen as the target for the propagation estimate, and we find that it is maximized by choosing a point in the nightside rather than dayside magnetosphere. In addition, we employ recurrence plot analysis to visualize contributions to the mutual information, this suggests that it appears on timescales of hours rather than minutes.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Solar wind, Geomagnetic indexes, Magnetospheric radio wave propagation, Magnetosphere
Journal or Publication Title:	Geophysical Research Letters
Publisher:	American Geophysical Union
ISSN:	0094-8276
Date:	2005
Volume:	Vol.32
Identification Number:	10.1029/2004GL021677
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3885

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