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Implications of rapid planetary rotation for the Dungey magnetotail of Saturn

Implications of rapid planetary rotation for the Dungey magnetotail of Saturn
Implications of rapid planetary rotation for the Dungey magnetotail of Saturn

Employing our current understanding of the structure and dynamics of Saturn's magnetosphere, we present a time-dependent model of the kronian Dungey cycle magnetotail, which is based upon a modification of a similar model developed for Earth's magnetotail (Milan, 2004a). The major difference arises due to the rapid rotation of Saturn and the partial corotation that this imposes on the open field lines threading the polar cap. This results in twisted tail lobes, with the form of concentric cylinders of oldest to newest open flux from the inside out. The oldest, and hence longest, open field lines form the backbone of a highly extended magnetotail. Surrounding this are bundles of field lines disconnected by tail reconnection, propagating down-tail at the solar wind speed. Owing to the twisted nature of the tail, these bundles remain entangled with the lobe cores to form "exterior flux ropes." In the limit that the addition and removal of open flux from the magnetosphere by magnetic reconnection can be treated as a last-in-first-out system, we formulate a description of the flux transport within the tail and drive this with estimated dayside reconnection voltages deduced from Cassini observations of the IMF made upstream of Saturn (Jackman et al., 2004).

2169-9380
1-10
Milan, S.E.
b6dd5367-b0c4-4f30-953a-f2d13078d656
Bunce, E.J.
208e1177-a92f-47a6-878d-ef27ed03f811
Cowley, S.W.H.
e8174910-ddcd-4a23-9d7c-0e1117def06c
Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Milan, S.E.
b6dd5367-b0c4-4f30-953a-f2d13078d656
Bunce, E.J.
208e1177-a92f-47a6-878d-ef27ed03f811
Cowley, S.W.H.
e8174910-ddcd-4a23-9d7c-0e1117def06c
Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529

Milan, S.E., Bunce, E.J., Cowley, S.W.H. and Jackman, C.M. (2005) Implications of rapid planetary rotation for the Dungey magnetotail of Saturn. Journal of Geophysical Research: Space Physics, 110 (A3), 1-10, [A03209]. (doi:10.1029/2004JA010716).

Record type: Article

Abstract

Employing our current understanding of the structure and dynamics of Saturn's magnetosphere, we present a time-dependent model of the kronian Dungey cycle magnetotail, which is based upon a modification of a similar model developed for Earth's magnetotail (Milan, 2004a). The major difference arises due to the rapid rotation of Saturn and the partial corotation that this imposes on the open field lines threading the polar cap. This results in twisted tail lobes, with the form of concentric cylinders of oldest to newest open flux from the inside out. The oldest, and hence longest, open field lines form the backbone of a highly extended magnetotail. Surrounding this are bundles of field lines disconnected by tail reconnection, propagating down-tail at the solar wind speed. Owing to the twisted nature of the tail, these bundles remain entangled with the lobe cores to form "exterior flux ropes." In the limit that the addition and removal of open flux from the magnetosphere by magnetic reconnection can be treated as a last-in-first-out system, we formulate a description of the flux transport within the tail and drive this with estimated dayside reconnection voltages deduced from Cassini observations of the IMF made upstream of Saturn (Jackman et al., 2004).

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Published date: March 2005

Identifiers

Local EPrints ID: 437122
URI: http://eprints.soton.ac.uk/id/eprint/437122
ISSN: 2169-9380
PURE UUID: 323a8c2e-a118-42e1-ba97-6cfeae33980e
ORCID for C.M. Jackman: ORCID iD orcid.org/0000-0003-0635-7361

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Date deposited: 17 Jan 2020 17:35
Last modified: 10 Nov 2021 03:35

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Contributors

Author: S.E. Milan
Author: E.J. Bunce
Author: S.W.H. Cowley
Author: C.M. Jackman ORCID iD

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