A Single Deformed Bow Shock for Titan-Saturn System

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Title: A Single Deformed Bow Shock for Titan-Saturn System
Author(s): Omidi, N
Sulaiman, AH
Kurth, W
Madanian, H
Cravens, T
Sergis, N
Dougherty, MK
Edberg, NJT
Item Type: Journal Article
Abstract: 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 showthat 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.
Publication Date: 6-Nov-2017
Date of Acceptance: 20-Oct-2017
URI: http://hdl.handle.net/10044/1/57259
DOI: https://dx.doi.org/10.1002/2017JA024672
ISSN: 2169-9380
Publisher: American Geophysical Union
Start Page: 11058
End Page: 11075
Journal / Book Title: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume: 122
Issue: 11
Copyright Statement: ©2017. American Geophysical Union. All Rights Reserved.
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
HOT FLOW ANOMALIES
SUPERSONIC SOLAR-WIND
MAGNETIC-FIELD
HYBRID SIMULATION
DIAMAGNETIC CAVITIES
FORESHOCK CAVITONS
PLASMA STRUCTURES
MAGNETOSHEATH
MAGNETOPAUSE
IONOSPHERE
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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