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The origin of Saturn's magnetic periodicities: Northern and southern current systems

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journal contribution
posted on 2016-01-12, 12:55 authored by D. J. Southwood, Stanley William Herbert Cowley
The recent survey by Andrews et al. (2012) of the separate northern and southern ~10.7 h periodic magnetic signals in Saturn's magnetosphere limits very much their governing current systems. The existence of signals with pure or close to pure northern or southern periods in respective polar caps taken with the relatively narrow bandwidth of the signals indicates that the actual periodicities are imposed independently from northern and southern polar regions, i.e., the open field line regions. Field-aligned currents must flow on the boundaries of these regions to exclude signals from the other hemisphere. Equatorward of the polar cap, on closed magnetic shells, there are distinct north and south “cam” source currents, the distinction being made clear by a difference in polarization. We outline the consequences for the governing current systems and the implications for sustaining the energy and power dissipation in the system.

History

Citation

Journal of Geophysical Research: Space Physics , 2014, 119 (3), pp. 1563-1571 (9)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Journal of Geophysical Research: Space Physics

Publisher

American Geophysical Union (AGU)

issn

2169-9380

eissn

2169-9402

Acceptance date

2014-02-02

Copyright date

2014

Available date

2016-01-12

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2013JA019632/abstract

Language

en

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