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Heliospheric conditions at Saturn during Cassini's ring-grazing and proximal orbits

Heliospheric conditions at Saturn during Cassini's ring-grazing and proximal orbits
Heliospheric conditions at Saturn during Cassini's ring-grazing and proximal orbits

We surveyed energetic charged particle measurements by Cassini between 2016 and the end of the mission in order to identify transients of solar energetic particles and galactic cosmic rays. Such transients offer hints about the state of the heliosphere and valuable context for interpreting space weather phenomena in Saturn's magnetosphere. The period studied includes the mission's Ring-Grazing and Proximal orbits, which due to their week-long periods are ideal for capturing short timescale dynamics in the planet's magnetosphere, including solar periodicities. We find that Saturn was exposed to corotating interaction regions for nearly all the 21 final months of Cassini and encountered just two interplanetary coronal mass ejections. Several independent studies report solar periodicities and storm-time conditions in the magnetosphere at times, which coincide with the transients that we identify here.

Galactic Cosmic Rays, Heliosphere, Magnetosphere, Saturn, Solar Energetic Particles, Solar Wind
0094-8276
10812-10818
Roussos, E.
6b85b964-976c-4bd0-b1aa-b2ba918482da
Krupp, N.
388f700a-7583-4b21-b358-27b51bc6317a
Paranicas, C.
afafdeb4-2f93-4322-848f-f35eb7054fb0
Kollmann, P.
e8028cc0-a696-4475-8836-c67ae718bb14
Mitchell, D.G.
990d4f16-a95d-46ed-9d79-175bd5ea336d
Krimigis, S.M.
6fc8b68e-aee4-4088-b506-1c36004c78a0
Palmaerts, B.
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Dialynas, K.
cc1114c8-7dc3-4c7a-b3ae-2cd739264fb9
Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Roussos, E.
6b85b964-976c-4bd0-b1aa-b2ba918482da
Krupp, N.
388f700a-7583-4b21-b358-27b51bc6317a
Paranicas, C.
afafdeb4-2f93-4322-848f-f35eb7054fb0
Kollmann, P.
e8028cc0-a696-4475-8836-c67ae718bb14
Mitchell, D.G.
990d4f16-a95d-46ed-9d79-175bd5ea336d
Krimigis, S.M.
6fc8b68e-aee4-4088-b506-1c36004c78a0
Palmaerts, B.
8098c221-14f6-4871-85eb-d489f21fda0c
Dialynas, K.
cc1114c8-7dc3-4c7a-b3ae-2cd739264fb9
Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529

Roussos, E., Krupp, N., Paranicas, C., Kollmann, P., Mitchell, D.G., Krimigis, S.M., Palmaerts, B., Dialynas, K. and Jackman, C.M. (2018) Heliospheric conditions at Saturn during Cassini's ring-grazing and proximal orbits. Geophysical Research Letters, 45 (20), 10812-10818. (doi:10.1029/2018GL078093).

Record type: Article

Abstract

We surveyed energetic charged particle measurements by Cassini between 2016 and the end of the mission in order to identify transients of solar energetic particles and galactic cosmic rays. Such transients offer hints about the state of the heliosphere and valuable context for interpreting space weather phenomena in Saturn's magnetosphere. The period studied includes the mission's Ring-Grazing and Proximal orbits, which due to their week-long periods are ideal for capturing short timescale dynamics in the planet's magnetosphere, including solar periodicities. We find that Saturn was exposed to corotating interaction regions for nearly all the 21 final months of Cassini and encountered just two interplanetary coronal mass ejections. Several independent studies report solar periodicities and storm-time conditions in the magnetosphere at times, which coincide with the transients that we identify here.

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More information

Accepted/In Press date: 12 May 2018
e-pub ahead of print date: 21 May 2018
Published date: 28 October 2018
Keywords: Galactic Cosmic Rays, Heliosphere, Magnetosphere, Saturn, Solar Energetic Particles, Solar Wind

Identifiers

Local EPrints ID: 425989
URI: https://eprints.soton.ac.uk/id/eprint/425989
ISSN: 0094-8276
PURE UUID: ce629158-7ffd-4a70-a59a-661937edffc5

Catalogue record

Date deposited: 09 Nov 2018 17:30
Last modified: 18 Dec 2018 17:30

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Contributors

Author: E. Roussos
Author: N. Krupp
Author: C. Paranicas
Author: P. Kollmann
Author: D.G. Mitchell
Author: S.M. Krimigis
Author: B. Palmaerts
Author: K. Dialynas
Author: C.M. Jackman

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