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  Recurrent Magnetic Dipolarization at Saturn: Revealed by Cassini

Yao, Z. H., Radioti, A., Grodent, D., Ray, L. C., Palmaerts, B., Sergis, N., et al. (2018). Recurrent Magnetic Dipolarization at Saturn: Revealed by Cassini. Journal of Geophysical Research: Space Physics, 123(10), 8502-8517. doi:10.1029/2018JA025837.

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Genre: Journal Article

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 Creators:
Yao, Z. H., Author
Radioti, A., Author
Grodent, D., Author
Ray, L. C, Author
Palmaerts, B., Author
Sergis, N., Author
Dialynas, K., Author
Coates, A. J., Author
Arridge, C. S., Author
Roussos, Elias1, Author              
Badman, S. V., Author
Ye, Sheng‐Yi, Author
Gérard, J.‐C., Author
Delamere, P. A., Author
Guo, R. L., Author
Pu, Z. Y., Author
Waite, J. H., Author
Krupp, Norbert1, Author              
Mitchell, D. G., Author
Dougherty, M. K., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: Planetary magnetospheres receive plasma and energy from the Sun or moons of planets and consequently stretch magnetic field lines. The process may last for varied timescales at different planets. From time to time, energy is rapidly released in the magnetosphere and subsequently precipitated into the ionosphere and upper atmosphere. Usually, this energy dissipation is associated with magnetic dipolarization in the magnetosphere.This process is accompanied by plasma acceleration and field‐aligned current formation, and subsequently auroral emissions are often significantly enhanced. Using measurements from multiple instruments on board the Cassini spacecraft, we reveal that magnetic dipolarization events at Saturn could reoccur after one planetary rotation and name them as recurrent dipolarizations. Three events are presented, including one from the dayside magnetosphere, which has no known precedent with terrestrial magnetospheric observations. During these events, recurrent energizations of plasma (electrons or ions) were also detected, which clearly demonstrate that these processes shall not be simply attributed to modulation of planetary periodic oscillation, although we do not exclude the possibility that the planetary periodic oscillation may modulate other processes (e.g., magnetic reconnection) which energizes particles. We discuss the potential physical mechanisms for generating the recurrent dipolarization process in a comprehensive view, including aurora and energetic neutral atom emissions.

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Language(s): eng - English
 Dates: 2019-04-242018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2018JA025837
 Degree: -

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Title: Journal of Geophysical Research: Space Physics
  Other : JGR-A
  Abbreviation : J. Geophys. Res. - A
Source Genre: Journal
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Affiliations:
Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 123 (10) Sequence Number: - Start / End Page: 8502 - 8517 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264