The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

Observation of saturnian stream particles in the interplanetary space

Observation of saturnian stream particles in the interplanetary space
Observation of saturnian stream particles in the interplanetary space

In January 2004 the dust instrument on the Cassini spacecraft detected the first high-velocity grain expelled from Saturn - a so-called stream particle. Prior to Cassini's arrival at Saturn in July 2004 the instrument registered 801 faint impacts, whose impact signals showed the characteristic features of a high-velocity impact by a tiny grain. The impact rates as well as the directionality of the stream particles clearly correlate with the sector structure of the interplanetary magnetic field (IMF). The Cosmic Dust Analyser (CDA) registered stream particles dominantly during periods when the IMF direction was tangential to the solar wind flow and in the prograde direction. This finding provides clear evidence for a continuous outflow of tiny dust grains with similar properties from the saturnian system. Within the compressed part of co-rotating interaction regions (CIRs) of the IMF, characterized by enhanced magnetic field strength and compressed solar wind plasma, CDA observed impact bursts of faster stream particles. We find that the bursts result from the stream particles being sped up inside the compressed CIR regions. Our analysis of the stream-particle dynamics inside rarefaction regions of the IMF implies that saturnian stream particles have sizes between 2 and 9 nm and exit the saturnian systems closely aligned with the planet's ring plane with speeds in excess of 70 km s-1.

Magnetic fields, Saturn, Solar wind
0019-1035
653-661
Hsu, Hsiang Wen
c64ba3e4-d55b-4871-98da-94a38dc480d6
Kempf, Sascha
101173f0-b948-4ae5-b3fd-d089dd51f0c9
Jackman, Caitriona M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Hsu, Hsiang Wen
c64ba3e4-d55b-4871-98da-94a38dc480d6
Kempf, Sascha
101173f0-b948-4ae5-b3fd-d089dd51f0c9
Jackman, Caitriona M.
9bc3456c-b254-48f1-ade0-912c5b8b4529

Hsu, Hsiang Wen, Kempf, Sascha and Jackman, Caitriona M. (2010) Observation of saturnian stream particles in the interplanetary space. Icarus, 206 (2), 653-661. (doi:10.1016/j.icarus.2009.06.033).

Record type: Article

Abstract

In January 2004 the dust instrument on the Cassini spacecraft detected the first high-velocity grain expelled from Saturn - a so-called stream particle. Prior to Cassini's arrival at Saturn in July 2004 the instrument registered 801 faint impacts, whose impact signals showed the characteristic features of a high-velocity impact by a tiny grain. The impact rates as well as the directionality of the stream particles clearly correlate with the sector structure of the interplanetary magnetic field (IMF). The Cosmic Dust Analyser (CDA) registered stream particles dominantly during periods when the IMF direction was tangential to the solar wind flow and in the prograde direction. This finding provides clear evidence for a continuous outflow of tiny dust grains with similar properties from the saturnian system. Within the compressed part of co-rotating interaction regions (CIRs) of the IMF, characterized by enhanced magnetic field strength and compressed solar wind plasma, CDA observed impact bursts of faster stream particles. We find that the bursts result from the stream particles being sped up inside the compressed CIR regions. Our analysis of the stream-particle dynamics inside rarefaction regions of the IMF implies that saturnian stream particles have sizes between 2 and 9 nm and exit the saturnian systems closely aligned with the planet's ring plane with speeds in excess of 70 km s-1.

This record has no associated files available for download.

More information

Published date: 1 April 2010
Keywords: Magnetic fields, Saturn, Solar wind

Identifiers

Local EPrints ID: 437321
URI: http://eprints.soton.ac.uk/id/eprint/437321
ISSN: 0019-1035
PURE UUID: b2ef13b3-527b-4932-9fc5-74cf522634bf
ORCID for Caitriona M. Jackman: ORCID iD orcid.org/0000-0003-0635-7361

Catalogue record

Date deposited: 24 Jan 2020 17:31
Last modified: 10 Nov 2021 03:35

Export record

Altmetrics

Contributors

Author: Hsiang Wen Hsu
Author: Sascha Kempf

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.

×