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Survey of Saturn’s magnetopause and bow shock positions over the entire Cassini mission: boundary statistical properties, and exploration of associated upstream conditions

Survey of Saturn’s magnetopause and bow shock positions over the entire Cassini mission: boundary statistical properties, and exploration of associated upstream conditions
Survey of Saturn’s magnetopause and bow shock positions over the entire Cassini mission: boundary statistical properties, and exploration of associated upstream conditions
The Cassini spacecraft orbited the planet Saturn from July 2004 to September 2017, and its varied orbital trajectory took it across the magnetopause and bow shock boundaries multiple times, at varying radial distances, local times, latitudes, and phases of the solar cycle. Here we present a comprehensive list of these boundary crossings, derived primarily using data from the Cassini magnetometer instrument, with cross‐validation against the electron spectrometer data where available. There are a multitude of scientific avenues for exploitation of this list. In this work, we examine the variability in boundary location and use the crossing times in concert with models of the bow shock and magnetopause to infer the upstream solar wind dynamic pressure at the times of crossings. This analysis allows us to understand the limitations of the Cassini trajectory for studying boundary physics under a range of solar wind driving conditions. In addition, rapid traversals of the magnetosheath are used to estimate the range of speeds of boundary motion.
bow shock, Cassini, magnetopause, magnetosphere, Saturn, solar wind
2169-9380
Jackman, Caitriona
9bc3456c-b254-48f1-ade0-912c5b8b4529
Thomsen, Michelle
cdee0323-632c-474a-9da8-da8294b773cf
Dougherty, Michele
cec0e668-2e69-4de9-9748-b3064c17cdc1
Jackman, Caitriona
9bc3456c-b254-48f1-ade0-912c5b8b4529
Thomsen, Michelle
cdee0323-632c-474a-9da8-da8294b773cf
Dougherty, Michele
cec0e668-2e69-4de9-9748-b3064c17cdc1

Jackman, Caitriona, Thomsen, Michelle and Dougherty, Michele (2019) Survey of Saturn’s magnetopause and bow shock positions over the entire Cassini mission: boundary statistical properties, and exploration of associated upstream conditions. Journal of Geophysical Research: Space Physics. (doi:10.1029/2019JA026628).

Record type: Article

Abstract

The Cassini spacecraft orbited the planet Saturn from July 2004 to September 2017, and its varied orbital trajectory took it across the magnetopause and bow shock boundaries multiple times, at varying radial distances, local times, latitudes, and phases of the solar cycle. Here we present a comprehensive list of these boundary crossings, derived primarily using data from the Cassini magnetometer instrument, with cross‐validation against the electron spectrometer data where available. There are a multitude of scientific avenues for exploitation of this list. In this work, we examine the variability in boundary location and use the crossing times in concert with models of the bow shock and magnetopause to infer the upstream solar wind dynamic pressure at the times of crossings. This analysis allows us to understand the limitations of the Cassini trajectory for studying boundary physics under a range of solar wind driving conditions. In addition, rapid traversals of the magnetosheath are used to estimate the range of speeds of boundary motion.

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Accepted/In Press date: 19 August 2019
e-pub ahead of print date: 14 October 2019
Published date: October 2019
Keywords: bow shock, Cassini, magnetopause, magnetosphere, Saturn, solar wind

Identifiers

Local EPrints ID: 435914
URI: http://eprints.soton.ac.uk/id/eprint/435914
ISSN: 2169-9380
PURE UUID: 124d1d15-e3e4-47a2-80c5-1b6d2d726769
ORCID for Caitriona Jackman: ORCID iD orcid.org/0000-0003-0635-7361

Catalogue record

Date deposited: 22 Nov 2019 17:30
Last modified: 26 Nov 2021 05:03

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Contributors

Author: Michelle Thomsen
Author: Michele Dougherty

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