Mechanisms of Saturn's Near-Noon Transient Aurora: In Situ Evidence From Cassini Measurements

Aurora; Cassini; Field-aligned current; Plasma wave; Saturn; Magnetic fields; Magnetoplasma; Magnetosphere; Planets; Plasma flow; Plasma waves; Remote sensing; Field aligned currents; Potential mechanism; Simultaneous measurement; Ultraviolet imaging spectrographs; Wave mode conversions; Plasma diagnostics

Abstract :

[en] Although auroral emissions at giant planets have been observed for decades, the physical mechanisms of aurorae at giant planets remain unclear. One key reason is the lack of simultaneous measurements in the magnetosphere while remote sensing of the aurora. We report a dynamic auroral event identified with the Cassini Ultraviolet Imaging Spectrograph (UVIS) at Saturn on 13 July 2008 with coordinated measurements of the magnetic field and plasma in the magnetosphere. The auroral intensification was transient, only lasting for ∼30 min. The magnetic field and plasma are perturbed during the auroral intensification period. We suggest that this intensification was caused by wave mode conversion generated field-aligned currents, and we propose two potential mechanisms for the generation of this plasma wave and the transient auroral intensification. A survey of the Cassini UVIS database reveals that this type of transient auroral intensification is very common (10/11 time sequences, and ∼10% of the total images). ©2017. American Geophysical Union.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Yao, Zhonghua ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Radioti, Aikaterini ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Rae, I. J.; UCL Mullard Space Science Laboratory Dorking UK

Liu, Jiang; University of California, Los Angeles - UCLA > IGPP

Grodent, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Ray, L. C.; Department of Physics Lancaster University Lancaster UK

Badman, S. V.; Department of Physics Lancaster University Lancaster UK

Coates, A. J.; UCL Mullard Space Science Laboratory Dorking UK

Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)

Waite, J. H.; Southwest Research Institute San Antonio, TX USA

More authors (8 more)

Language :

English

Title :

Mechanisms of Saturn's Near-Noon Transient Aurora: In Situ Evidence From Cassini Measurements

Publication date :

2017

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

Blackwell Publishing Ltd

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://onlinelibrary.wiley.com/doi/10.1002/2017GL075108/epdf

Available on ORBi :

since 11 January 2018

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