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Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection

We present a case study of an event from 20 August (day 232) of 2006, when the Cassini spacecraft was sampling the region near 32 R(S) and 22 h LT in Saturn's magnetotail. Cassini observed a strong northward‐to‐southward turning of the magnetic field, which is interpreted as the signature of di...

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Autores principales: Jackman, C. M., Thomsen, M. F., Mitchell, D. G., Sergis, N., Arridge, C. S., Felici, M., Badman, S. V., Paranicas, C., Jia, X., Hospodarksy, G. B., Andriopoulou, M., Khurana, K. K., Smith, A. W., Dougherty, M. K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4981121/
https://www.ncbi.nlm.nih.gov/pubmed/27570722
http://dx.doi.org/10.1002/2015JA020995
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author Jackman, C. M.
Thomsen, M. F.
Mitchell, D. G.
Sergis, N.
Arridge, C. S.
Felici, M.
Badman, S. V.
Paranicas, C.
Jia, X.
Hospodarksy, G. B.
Andriopoulou, M.
Khurana, K. K.
Smith, A. W.
Dougherty, M. K.
author_facet Jackman, C. M.
Thomsen, M. F.
Mitchell, D. G.
Sergis, N.
Arridge, C. S.
Felici, M.
Badman, S. V.
Paranicas, C.
Jia, X.
Hospodarksy, G. B.
Andriopoulou, M.
Khurana, K. K.
Smith, A. W.
Dougherty, M. K.
author_sort Jackman, C. M.
collection PubMed
description We present a case study of an event from 20 August (day 232) of 2006, when the Cassini spacecraft was sampling the region near 32 R(S) and 22 h LT in Saturn's magnetotail. Cassini observed a strong northward‐to‐southward turning of the magnetic field, which is interpreted as the signature of dipolarization of the field as seen by the spacecraft planetward of the reconnection X line. This event was accompanied by very rapid (up to ~1500 km s(−1)) thermal plasma flow toward the planet. At energies above 28 keV, energetic hydrogen and oxygen ion flow bursts were observed to stream planetward from a reconnection site downtail of the spacecraft. Meanwhile, a strong field‐aligned beam of energetic hydrogen was also observed to stream tailward, likely from an ionospheric source. Saturn kilometric radiation emissions were stimulated shortly after the observation of the dipolarization. We discuss the field, plasma, energetic particle, and radio observations in the context of the impact this reconnection event had on global magnetospheric dynamics.
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spelling pubmed-49811212016-08-24 Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection Jackman, C. M. Thomsen, M. F. Mitchell, D. G. Sergis, N. Arridge, C. S. Felici, M. Badman, S. V. Paranicas, C. Jia, X. Hospodarksy, G. B. Andriopoulou, M. Khurana, K. K. Smith, A. W. Dougherty, M. K. J Geophys Res Space Phys Research Articles We present a case study of an event from 20 August (day 232) of 2006, when the Cassini spacecraft was sampling the region near 32 R(S) and 22 h LT in Saturn's magnetotail. Cassini observed a strong northward‐to‐southward turning of the magnetic field, which is interpreted as the signature of dipolarization of the field as seen by the spacecraft planetward of the reconnection X line. This event was accompanied by very rapid (up to ~1500 km s(−1)) thermal plasma flow toward the planet. At energies above 28 keV, energetic hydrogen and oxygen ion flow bursts were observed to stream planetward from a reconnection site downtail of the spacecraft. Meanwhile, a strong field‐aligned beam of energetic hydrogen was also observed to stream tailward, likely from an ionospheric source. Saturn kilometric radiation emissions were stimulated shortly after the observation of the dipolarization. We discuss the field, plasma, energetic particle, and radio observations in the context of the impact this reconnection event had on global magnetospheric dynamics. John Wiley and Sons Inc. 2015-05 2015-05-19 /pmc/articles/PMC4981121/ /pubmed/27570722 http://dx.doi.org/10.1002/2015JA020995 Text en ©2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Jackman, C. M.
Thomsen, M. F.
Mitchell, D. G.
Sergis, N.
Arridge, C. S.
Felici, M.
Badman, S. V.
Paranicas, C.
Jia, X.
Hospodarksy, G. B.
Andriopoulou, M.
Khurana, K. K.
Smith, A. W.
Dougherty, M. K.
Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection
title Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection
title_full Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection
title_fullStr Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection
title_full_unstemmed Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection
title_short Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi‐steady reconnection
title_sort field dipolarization in saturn's magnetotail with planetward ion flows and energetic particle flow bursts: evidence of quasi‐steady reconnection
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4981121/
https://www.ncbi.nlm.nih.gov/pubmed/27570722
http://dx.doi.org/10.1002/2015JA020995
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