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The overall configuration of the interplanetary magnetic field upstream of Saturn as revealed by Cassini observations

The overall configuration of the interplanetary magnetic field upstream of Saturn as revealed by Cassini observations
The overall configuration of the interplanetary magnetic field upstream of Saturn as revealed by Cassini observations

The Cassini spacecraft approached Saturn during the declining phase of the solar cycle, at a time when the heliosphere was highly structured by compressions and rarefactions associated with corotating interaction regions (CIRs). We examine in detail the hourly averaged interplanetary magnetic field (IMF) data prior to Saturn Orbit Insertion and during one subsequent orbit of Cassini closer to solar minimum, where the spacecraft spent several months in me solar wind. We observe the effects of CIRs on IMF structure and show examples of where this structure is disturbed by the passage of strong coronal mass ejections and by solar cycle effects. We examine the field directions and find that in general, they correspond well to the predictions of the Parker model, but with several notable deviations, which we discuss.

2169-9380
1-10
Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Forsyth, R.J.
62ee04c4-acb7-4481-88d8-8feffd7f8584
Dougherty, M.K.
aa297043-7e86-4501-952b-a6363edaaba8
Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Forsyth, R.J.
62ee04c4-acb7-4481-88d8-8feffd7f8584
Dougherty, M.K.
aa297043-7e86-4501-952b-a6363edaaba8

Jackman, C.M., Forsyth, R.J. and Dougherty, M.K. (2008) The overall configuration of the interplanetary magnetic field upstream of Saturn as revealed by Cassini observations. Journal of Geophysical Research: Space Physics, 113 (8), 1-10, [A08114]. (doi:10.1029/2008JA013083).

Record type: Article

Abstract

The Cassini spacecraft approached Saturn during the declining phase of the solar cycle, at a time when the heliosphere was highly structured by compressions and rarefactions associated with corotating interaction regions (CIRs). We examine in detail the hourly averaged interplanetary magnetic field (IMF) data prior to Saturn Orbit Insertion and during one subsequent orbit of Cassini closer to solar minimum, where the spacecraft spent several months in me solar wind. We observe the effects of CIRs on IMF structure and show examples of where this structure is disturbed by the passage of strong coronal mass ejections and by solar cycle effects. We examine the field directions and find that in general, they correspond well to the predictions of the Parker model, but with several notable deviations, which we discuss.

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Published date: 1 August 2008

Identifiers

Local EPrints ID: 437124
URI: http://eprints.soton.ac.uk/id/eprint/437124
ISSN: 2169-9380
PURE UUID: ef91966f-9558-4755-bac8-8f5fd9655048
ORCID for C.M. Jackman: ORCID iD orcid.org/0000-0003-0635-7361

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

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Contributors

Author: C.M. Jackman ORCID iD
Author: R.J. Forsyth
Author: M.K. Dougherty

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