The University of Southampton
University of Southampton Institutional Repository

Saturn plasma sources and associated transport processes

Saturn plasma sources and associated transport processes
Saturn plasma sources and associated transport processes

This article reviews the different sources of plasma for Saturn’s magnetosphere, as they are known essentially from the scientific results of the Cassini-Huygens mission to Saturn and Titan. At low and medium energies, the main plasma source is the H2O cloud produced by the “geyser” activity of the small satellite Enceladus. Impact ionization of this cloud occurs to produce on the order of 100 kg/s of fresh plasma, a source which dominates all the other ones: Titan (which produces much less plasma than anticipated before the Cassini mission), the rings, the solar wind (a poorly known source due to the lack of quantitative knowledge of the degree of coupling between the solar wind and Saturn’s magnetosphere), and the ionosphere. At higher energies, energetic particles are produced by energy diffusion and acceleration of lower energy plasma produced by the interchange instabilities induced by the rapid rotation of Saturn, and possibly, for the highest energy range, by contributions from the CRAND process acting inside Saturn’s magnetosphere. Discussion of the transport and acceleration processes acting on these plasma sources shows the importance of rotation-induced radial transport and energization of the plasma, and also shows how much the unexpected planetary modulation of essentially all plasma parameters of Saturn’s magnetosphere remains an unexplained mystery.

Magnetosphere, Plasma transport, Radiation belts, Satellites, Saturn, Solar wind
0038-6308
237-283
Blanc, M.
89fff285-db9d-4dca-aa68-47925af17ee2
Andrews, D. J.
cda6ad85-b896-4d75-b439-ea2e3b804a7c
Coates, A. J.
04f7e558-21ff-4b0e-9586-78c946babc90
Hamilton, D. C.
86f1fe89-bd97-43bf-bb02-f8758ae56dad
Jackman, C. M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Jia, X.
0b268c4d-354d-40fe-bf84-8618bed40f33
Kotova, A.
a3da57ab-8062-42ad-94ab-6cb99d0ef210
Morooka, M.
b487106d-c13c-4882-b99a-4a4d090846e2
Smith, H. T.
0830b70e-c324-4c90-b37d-bb57ae7a90bd
Westlake, J. H.
1e2e2abb-b71c-452b-a1b6-1a8000269438
Blanc, M.
89fff285-db9d-4dca-aa68-47925af17ee2
Andrews, D. J.
cda6ad85-b896-4d75-b439-ea2e3b804a7c
Coates, A. J.
04f7e558-21ff-4b0e-9586-78c946babc90
Hamilton, D. C.
86f1fe89-bd97-43bf-bb02-f8758ae56dad
Jackman, C. M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Jia, X.
0b268c4d-354d-40fe-bf84-8618bed40f33
Kotova, A.
a3da57ab-8062-42ad-94ab-6cb99d0ef210
Morooka, M.
b487106d-c13c-4882-b99a-4a4d090846e2
Smith, H. T.
0830b70e-c324-4c90-b37d-bb57ae7a90bd
Westlake, J. H.
1e2e2abb-b71c-452b-a1b6-1a8000269438

Blanc, M., Andrews, D. J., Coates, A. J., Hamilton, D. C., Jackman, C. M., Jia, X., Kotova, A., Morooka, M., Smith, H. T. and Westlake, J. H. (2015) Saturn plasma sources and associated transport processes. Space Science Reviews, 192 (1-4), 237-283. (doi:10.1007/s11214-015-0172-9).

Record type: Review

Abstract

This article reviews the different sources of plasma for Saturn’s magnetosphere, as they are known essentially from the scientific results of the Cassini-Huygens mission to Saturn and Titan. At low and medium energies, the main plasma source is the H2O cloud produced by the “geyser” activity of the small satellite Enceladus. Impact ionization of this cloud occurs to produce on the order of 100 kg/s of fresh plasma, a source which dominates all the other ones: Titan (which produces much less plasma than anticipated before the Cassini mission), the rings, the solar wind (a poorly known source due to the lack of quantitative knowledge of the degree of coupling between the solar wind and Saturn’s magnetosphere), and the ionosphere. At higher energies, energetic particles are produced by energy diffusion and acceleration of lower energy plasma produced by the interchange instabilities induced by the rapid rotation of Saturn, and possibly, for the highest energy range, by contributions from the CRAND process acting inside Saturn’s magnetosphere. Discussion of the transport and acceleration processes acting on these plasma sources shows the importance of rotation-induced radial transport and energization of the plasma, and also shows how much the unexpected planetary modulation of essentially all plasma parameters of Saturn’s magnetosphere remains an unexplained mystery.

Full text not available from this repository.

More information

Published date: 1 October 2015
Keywords: Magnetosphere, Plasma transport, Radiation belts, Satellites, Saturn, Solar wind

Identifiers

Local EPrints ID: 436465
URI: http://eprints.soton.ac.uk/id/eprint/436465
ISSN: 0038-6308
PURE UUID: 4cd3fdc1-55cd-423d-814c-8c0083130895
ORCID for C. M. Jackman: ORCID iD orcid.org/0000-0003-0635-7361

Catalogue record

Date deposited: 11 Dec 2019 17:30
Last modified: 07 Oct 2020 02:04

Export record

Altmetrics

Contributors

Author: M. Blanc
Author: D. J. Andrews
Author: A. J. Coates
Author: D. C. Hamilton
Author: C. M. Jackman ORCID iD
Author: X. Jia
Author: A. Kotova
Author: M. Morooka
Author: H. T. Smith
Author: J. H. Westlake

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×