Magnetosphere-ionosphere coupling at Jupiter:Effect of field-aligned potentials on angular momentum transport

Ray, L. C. and Ergun, R. E. and Delamere, P. A. and Bagenal, F. (2010) Magnetosphere-ionosphere coupling at Jupiter:Effect of field-aligned potentials on angular momentum transport. Journal of Geophysical Research: Space Physics, 115 (9). ISSN 2169-9402

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Abstract

We present a time-independent model of Jupiter's rotation-driven aurora based on angular momentum conservation, including the effects of a field-aligned potential (φ∥) and an ionospheric conductivity that is modified by precipitating electrons. We argue that φ∥ arises from a limit to field-aligned current at high latitudes, and hence, we apply a current-voltage relation, which takes into account the low plasma densities at high latitudes. The resulting set of nonlinear equations that govern the behavior of angular momentum transfer is underconstrained and leads to a set of solutions, including those derived in earlier work. We show that solutions with high angular momentum transfer, large radial currents, and small mass transport rates (Ṁ ≤ 1000 kg/s) exist. Our set of solutions can reproduce many of the observed characteristics of Jupiter's main auroral oval, including the energy of the precipitating electrons, the energy flux into the ionosphere, the width of the aurora at the ionosphere, and net radial current across the field for a radial mass transport value of ∼500 kg/s.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Geophysical Research: Space Physics
Additional Information:
Copyright 2010 by the American Geophysical Union
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1911
Subjects:
ID Code:
83392
Deposited By:
Deposited On:
02 Dec 2016 14:54
Refereed?:
Yes
Published?:
Published
Last Modified:
21 Oct 2020 04:21