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

Jackman, C. M. and Thomsen, M. F. and Mitchell, D. G. and Sergis, N. and Arridge, C. S. and Felici, M. and Badman, S. V. and Paranicas, C. and Jia, X. and Hospodarksy, G. B. and Andriopoulou, M. and Khurana, K. K. and Smith, A. W. and Dougherty, M. K. (2015) Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts:evidence of quasi-steady reconnection. Journal of Geophysical Research: Space Physics, 120 (5). pp. 3603-3617. ISSN 2169-9380

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Abstract

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 similar 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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Geophysical Research: Space Physics
Additional Information:
©2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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ID Code:
75580
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Deposited On:
11 Sep 2015 13:04
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Jul 2020 05:14