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  Long-standing Small-scale Reconnection Processes at Saturn Revealed by Cassini

Guo, R. L., Yao, Z. H., Sergis, N., Wei, Y., Xu, X. J., Coates, A. J., et al. (2019). Long-standing Small-scale Reconnection Processes at Saturn Revealed by Cassini. Astrophysical Journal, Letters, 884(1): L14. doi:10.3847/2041-8213/ab4429.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-DB35-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-DB36-8
Genre: Journal Article

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 Creators:
Guo, R. L., Author
Yao, Z. H., Author
Sergis, N., Author
Wei, Y., Author
Xu, X. J., Author
Coates, A. J., Author
Delamere, P. A., Author
Roussos, Elias1, Author              
Arridge, C. S., Author
Waite, J. H., Author
Krupp, Norbert1, Author              
Mitchell, D., Author
Burch, J., Author
Dougherty, M. K., Author
Wa, W. X., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: The internal mass source from the icy moon Enceladus in Saturn's rapidly rotating magnetosphere drives electromagnetic dynamics in multiple spatial and temporal scales. The distribution and circulation of the internal plasma and associated energy are thus crucial in understanding Saturn's magnetospheric environment. Magnetic reconnection is one of the key processes in driving plasma and energy transport in the magnetosphere, and also a fundamental plasma process in energizing charged particles. Recent works suggested that reconnection driven by Saturn's rapid rotation might appear as a chain of microscale structures, named drizzle-like reconnection. The drizzle-like reconnection could exist not only in the nightside magnetodisk, but also in the dayside magnetodisk. Here, using in situ measurements from the Cassini spacecraft, we report multiple reconnection sites that were successively detected during a time interval longer than one rotation period. The time separation between two adjacently detected reconnection sites can be much less than one rotation period, implying that the reconnection processes are likely small-scale, or frequently repetitive. The spatial distribution of the identified long-standing multiple small reconnection site sequences shows no significant preference on local times. We propose that the small reconnection sites discussed in this Letter are rotationally driven and rotate with the magnetosphere. Since the reconnection process on Saturn can be long-durational, the rotational regime can cause these small-scale reconnection sites to spread to all local times, resulting in global release of energy and mass from the magnetosphere.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3847/2041-8213/ab4429
 Degree: -

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Title: Astrophysical Journal, Letters
  Other : ApJL
Source Genre: Journal
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Publ. Info: Bristol, UK : Institute of Physics Publishing (IOP)
Pages: - Volume / Issue: 884 (1) Sequence Number: L14 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_1