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A Single Deformed Bow Shock for Titan-Saturn System
Solana Sci Inc, Solana Beach, CA 92075 USA..
Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA..
Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA..
Univ Kansas, Dept Phys, Lawrence, KS 66045 USA..
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2017 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 122, no 11, p. 11058-11075Article in journal (Refereed) Published
Abstract [en]

During periods of high solar wind pressure, Saturn's bow shock is pushed inside Titan's orbit exposing the moon and its ionosphere to the solar wind. The Cassini spacecraft's T96 encounter with Titan occurred during such a period and showed evidence for shocks associated with Saturn and Titan. It also revealed the presence of two foreshocks: one prior to the closest approach (foreshock 1) and one after (foreshock 2). Using electromagnetic hybrid (kinetic ions and fluid electrons) simulations and Cassini observations, we show that the origin of foreshock 1 is tied to the formation of a single deformed bow shock for the Titan-Saturn system. We also report the observations of a structure in foreshock 1 with properties consistent with those of spontaneous hot flow anomalies formed in the simulations and previously observed at Earth, Venus, and Mars. The results of hybrid simulations also show the generation of oblique fast magnetosonic waves upstream of the outbound Titan bow shock in agreement with the observations of large-amplitude magnetosonic pulsations in foreshock 2. We also discuss the implications of a single deformed bow shock for new particle acceleration mechanisms and also Saturn's magnetopause and magnetosphere.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2017. Vol. 122, no 11, p. 11058-11075
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-342087DOI: 10.1002/2017JA024672ISI: 000419938600011OAI: oai:DiVA.org:uu-342087DiVA, id: diva2:1186885
Available from: 2018-03-01 Created: 2018-03-01 Last updated: 2018-03-01Bibliographically approved

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Edberg, Niklas J. T.

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Swedish Institute of Space Physics, Uppsala Division
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