Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/19168
Title: Statistical characteristics of field-aligned currents in Saturn's nightside magnetosphere
Authors: Talboys, D. L.
Bunce, E. J.
Cowley, S. W. H.
Arridge, C. S.
Coates, A. J.
Dougherty, M. K.
First Published: 15-Apr-2011
Publisher: American Geophysical Union (AGU); Wiley
Citation: Journal of Geophysical Research-SPACE PHYSICS, 2011, 116
Abstract: [1] During 2008, the Cassini spacecraft traversed Saturn's high-latitude field-aligned current systems on sequential north–south periapsis passes in the nightside magnetosphere. Two types of current systems have previously been identified, associated with antisymmetric azimuthal field signatures in the northern and southern hemispheres. The first exhibits exclusively “lagging” field morphology, while the second also includes an equatorward interval of “leading” field. Here we report the statistical characteristics of these currents, their strength, ionospheric location, and relationship to plasma boundaries. From high to low latitude, the first type comprises a downward current followed by an upward current, whose strengths are ∼0.5–3.5 MA per radian of azimuth. The downward current maps to ionospheric colatitudes of ∼13.5° and ∼16° in the north and south, respectively, usually centered in the outer magnetosphere, while the upward current maps to ∼16.5° and ∼19° in the north and south, located within the ring current region. The second type comprises a distributed downward current of ∼1–2 MA rad−1 flowing in the open field and outer magnetosphere regions, followed by an upward current of ∼2.5–5 MA rad−1 mapping to ∼15.5° and ∼18° in the north and south, corresponding to the outer magnetosphere and outer ring current, and a further downward current of ∼1–2.5 MA rad−1 mapping to ∼17.5° and ∼20° in the north and south, corresponding to the inner ring current.
DOI Link: 10.1029/2010JA016102
ISSN: 0148-0227
Links: http://hdl.handle.net/2381/19168
http://onlinelibrary.wiley.com/doi/10.1029/2010JA016102/abstract
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2011 by the American Geophysical Union. All rights reserved. Archived with reference to Usage Permissions granted to authors, available at http://publications.agu.org/author-resource-center/usage-permissions/
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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