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Low frequency extensions of the saturn kilometric radiation as a proxy for magnetospheric dynamics

Low frequency extensions of the saturn kilometric radiation as a proxy for magnetospheric dynamics
Low frequency extensions of the saturn kilometric radiation as a proxy for magnetospheric dynamics
Saturn Kilometric Radiation (SKR) is an auroral radio emission which can be detected quasi-continuously by the Cassini spacecraft. It has been shown to respond to magnetotail reconnection and to changes in solar wind conditions, and thus oers the potential to be used as a remote proxy for magnetospheric dynamics. This work has developed criteria for the selection of low frequency extensions (LFE), powerful intensications of the main SKR emission, accompanied by an expansion of the SKR to lower frequencies. Upon examination of data from the Cassini Radio and Plasma Wave Science (RPWS) instrument, we detect 282 LFE events which are further grouped into two categories. Shorter events (< 20 hours) associated with tail reconnection have a median waiting time of 10 hours, a median duration of 3.1 hours and a strong correlation with the northern and southern SKR phase systems. 60% of the short LFEs have a reconnection event within the preceding 6 hours. Longer events (> 20 hours), associated with increases in solar wind dynamic pressure, can last multiple planetary rotations, have a median waiting time of 20 days and show no relationship with SKR phase. An analysis of the power emitted during LFEs suggests that tail reconnection is not always observed or detected in situ which may partially explain the low correlation between LFEs and tail reconnection. We conclude that short LFEs are a good proxy for reconnection in the tail.
2169-9380
Reed, Joe
f23de801-80a4-4067-89df-14ed112e79a2
Jackman, Caitriona
9bc3456c-b254-48f1-ade0-912c5b8b4529
Lamy, Laurent
47c77ab1-f831-44fc-8ba9-72013b1059fe
Whiter, Daniel
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Kurth, W. S.
68ef824f-23ee-4e70-8b4c-b64021b7a3b9
Reed, Joe
f23de801-80a4-4067-89df-14ed112e79a2
Jackman, Caitriona
9bc3456c-b254-48f1-ade0-912c5b8b4529
Lamy, Laurent
47c77ab1-f831-44fc-8ba9-72013b1059fe
Whiter, Daniel
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Kurth, W. S.
68ef824f-23ee-4e70-8b4c-b64021b7a3b9

Reed, Joe, Jackman, Caitriona, Lamy, Laurent, Whiter, Daniel and Kurth, W. S. (2018) Low frequency extensions of the saturn kilometric radiation as a proxy for magnetospheric dynamics. Journal of Geophysical Research: Space Physics. (doi:10.1002/2017JA024499).

Record type: Article

Abstract

Saturn Kilometric Radiation (SKR) is an auroral radio emission which can be detected quasi-continuously by the Cassini spacecraft. It has been shown to respond to magnetotail reconnection and to changes in solar wind conditions, and thus oers the potential to be used as a remote proxy for magnetospheric dynamics. This work has developed criteria for the selection of low frequency extensions (LFE), powerful intensications of the main SKR emission, accompanied by an expansion of the SKR to lower frequencies. Upon examination of data from the Cassini Radio and Plasma Wave Science (RPWS) instrument, we detect 282 LFE events which are further grouped into two categories. Shorter events (< 20 hours) associated with tail reconnection have a median waiting time of 10 hours, a median duration of 3.1 hours and a strong correlation with the northern and southern SKR phase systems. 60% of the short LFEs have a reconnection event within the preceding 6 hours. Longer events (> 20 hours), associated with increases in solar wind dynamic pressure, can last multiple planetary rotations, have a median waiting time of 20 days and show no relationship with SKR phase. An analysis of the power emitted during LFEs suggests that tail reconnection is not always observed or detected in situ which may partially explain the low correlation between LFEs and tail reconnection. We conclude that short LFEs are a good proxy for reconnection in the tail.

Text Reed_et_al-2018-Journal_of_Geophysical_Research__Space_Physics - Accepted Manuscript
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Accepted/In Press date: 20 December 2017
e-pub ahead of print date: 21 January 2018

Identifiers

Local EPrints ID: 417106
URI: https://eprints.soton.ac.uk/id/eprint/417106
ISSN: 2169-9380
PURE UUID: 6963434c-928a-4b90-9c43-80f0c7e918d2
ORCID for Daniel Whiter: ORCID iD orcid.org/0000-0001-7130-232X

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Date deposited: 19 Jan 2018 17:30
Last modified: 23 Apr 2018 16:31

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Author: Joe Reed
Author: Laurent Lamy
Author: Daniel Whiter ORCID iD
Author: W. S. Kurth

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