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Saturn Plasma Sources and Associated Transport Processes
Univ Toulouse 3, CNRS, IRAP, F-31062 Toulouse, France..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England..
Univ Maryland, Dept Phys, College Pk, MD 20742 USA..
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2015 (English)In: Space Science Reviews, ISSN 0038-6308, E-ISSN 1572-9672, Vol. 192, no 1-4, 237-283 p.Article, review/survey (Refereed) Published
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Abstract [en]

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 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.

Place, publisher, year, edition, pages
2015. Vol. 192, no 1-4, 237-283 p.
Keyword [en]
Saturn, Magnetosphere, Satellites, Plasma transport, Solar wind, Radiation belts
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-272106DOI: 10.1007/s11214-015-0172-9ISI: 000363723000007OAI: oai:DiVA.org:uu-272106DiVA: diva2:893070
Funder
Swedish National Space Board
Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2017-11-30Bibliographically approved

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Andrews, David. J.

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