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  Reconnection Acceleration in Saturn's Dayside Magnetodisk: A Multicase Study with Cassini

Guo, R. L., Yao, Z. H., Sergis, N., Wei, Y., Mitchell, D., Roussos, E., et al. (2018). Reconnection Acceleration in Saturn's Dayside Magnetodisk: A Multicase Study with Cassini. The Astrophysical Journal Letters, 868(2): L23. doi:10.3847/2041-8213/aaedab.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-7DEB-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-7DEC-8
Genre: Journal Article

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 Creators:
Guo, R. L., Author
Yao, Z. H., Author
Sergis, N., Author
Wei, Y., Author
Mitchell, D., Author
Roussos, Elias1, Author              
Palmaerts, B., Author
Dunn, W. R., Author
Radioti, A., Author
Ray, L. C., Author
Coates, A. J., Author
Grodent, D., Author
Arridge, C. S., Author
Kollmann, P., Author
Krupp, Norbert1, Author              
Waite, J. H., Author
Dougherty, M. K., Author
Burch, J. L., Author
Wan, 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: Recently, rotationally driven magnetic reconnection was first discovered in Saturn's dayside magnetosphere. This newly confirmed process could potentially drive bursty phenomena at Saturn, i.e., pulsating energetic particles and auroral emissions. Using Cassini's measurements of magnetic fields and charged particles, we investigate particle acceleration features during three magnetic reconnection events observed in Saturn's dayside magnetodisk. The results suggest that the rotationally driven reconnection process plays a key role in producing energetic electrons (up to 100 keV) and ions (several hundreds of kiloelectron volts). In particular, we find that energetic oxygen ions are locally accelerated at all three reconnection sites. Isolated, multiple reconnection sites were recorded in succession during an interval lasting for much less than one Saturn rotation period. Moreover, a secondary magnetic island is reported for the first time at the dayside, collectively suggesting that the reconnection process is not steady and could be "drizzle-like." This study demonstrates the fundamental importance of internally driven magnetic reconnection in accelerating particles in Saturn's dayside magnetosphere, and likewise in the rapidly rotating Jovian magnetosphere and beyond.

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Language(s): eng - English
 Dates: 2019-04-242018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/2041-8213/aaedab
 Degree: -

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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Affiliations:
Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 868 (2) Sequence Number: L23 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215