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On the character and distribution of lower-frequency radio emissions at Saturn and their relationship to substorm-like events

On the character and distribution of lower-frequency radio emissions at Saturn and their relationship to substorm-like events
On the character and distribution of lower-frequency radio emissions at Saturn and their relationship to substorm-like events
With the arrival of the Cassini spacecraft at Saturn in July 2004, there have been quasi-continuous observations of Saturn kilometric radiation (SKR) emissions. Exploration of the nightside magnetosphere has revealed evidence of plasmoid-like magnetic structures and other phenomena indicative of the Kronian equivalent of terrestrial substorms. In general, there is a good correlation between the timing of reconnection events and enhancements in the auroral SKR emission. Eight of nine reconnection events studied occur at SKR phases where the SKR power would be expected to be rising with time. Thus, while the recurrence rate of substorm-like events at Saturn is likely much longer than the planetary rotation timescale, the events are favored to occur at a particular phase of the rotation. We show three examples in each of which the SKR spectrum extends to lower frequencies than usual. This can be interpreted as an expansion of the auroral particle acceleration region to higher altitudes along magnetic field lines as a direct consequence of an increase in the magnetosphere-ionosphere current density driven by substorm-like events. We then conduct a survey of such low-frequency extensions during the equatorial orbits of 2005–2006 and place some constraints on visibility of these radio emissions.
0148-0227
1-13
Jackman, C.M.
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Lamy, L.
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Freeman, M.P.
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Zarka, P.
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Cecconi, B.
eade7145-f6d1-4a0c-ad3d-9defe711c9d0
Kurth, W.S.
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Cowley, S.W.H.
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Dougherty, M.K.
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Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Lamy, L.
aad11182-ba51-4937-99f3-cf983891abdd
Freeman, M.P.
ca34cfc2-086e-4b43-9cb1-921ccbdadb10
Zarka, P.
7451615e-ffa7-4bf5-a710-fb03ad7e08fa
Cecconi, B.
eade7145-f6d1-4a0c-ad3d-9defe711c9d0
Kurth, W.S.
d36a3c96-504f-435c-9c62-767d71a5d3e6
Cowley, S.W.H.
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Dougherty, M.K.
dfb81a1a-1b8d-4326-8416-5f66eb79e00a

Jackman, C.M., Lamy, L., Freeman, M.P., Zarka, P., Cecconi, B., Kurth, W.S., Cowley, S.W.H. and Dougherty, M.K. (2009) On the character and distribution of lower-frequency radio emissions at Saturn and their relationship to substorm-like events. Journal of Geophysical Research, 114 (A08211), 1-13. (doi:10.1029/2008JA013997).

Record type: Article

Abstract

With the arrival of the Cassini spacecraft at Saturn in July 2004, there have been quasi-continuous observations of Saturn kilometric radiation (SKR) emissions. Exploration of the nightside magnetosphere has revealed evidence of plasmoid-like magnetic structures and other phenomena indicative of the Kronian equivalent of terrestrial substorms. In general, there is a good correlation between the timing of reconnection events and enhancements in the auroral SKR emission. Eight of nine reconnection events studied occur at SKR phases where the SKR power would be expected to be rising with time. Thus, while the recurrence rate of substorm-like events at Saturn is likely much longer than the planetary rotation timescale, the events are favored to occur at a particular phase of the rotation. We show three examples in each of which the SKR spectrum extends to lower frequencies than usual. This can be interpreted as an expansion of the auroral particle acceleration region to higher altitudes along magnetic field lines as a direct consequence of an increase in the magnetosphere-ionosphere current density driven by substorm-like events. We then conduct a survey of such low-frequency extensions during the equatorial orbits of 2005–2006 and place some constraints on visibility of these radio emissions.

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Jackman et al. Character distribution LFEs and substorms JGR09.pdf - Version of Record
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Published date: 18 August 2009
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 356970
URI: http://eprints.soton.ac.uk/id/eprint/356970
ISSN: 0148-0227
PURE UUID: 8cc1382e-3b21-482f-8d29-0e6643b31aec
ORCID for C.M. Jackman: ORCID iD orcid.org/0000-0003-0635-7361

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Date deposited: 03 Oct 2013 13:14
Last modified: 21 Nov 2021 03:09

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Contributors

Author: C.M. Jackman ORCID iD
Author: L. Lamy
Author: M.P. Freeman
Author: P. Zarka
Author: B. Cecconi
Author: W.S. Kurth
Author: S.W.H. Cowley
Author: M.K. Dougherty

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