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

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Title: Mechanisms of Saturn's Near-Noon Transient Aurora: In Situ Evidence From Cassini Measurements
Authors: Yao, ZH
Radioti, A
Rae, IJ
Liu, J
Grodent, D
Ray, LC
Badman, SV
Coates, AJ
Gerard, J-C
Waite, JH
Yates, JN
Shi, QQ
Wei, Y
Bonfond, B
Dougherty, MK
Roussos, E
Sergis, N
Palmaerts, B
Item Type: Journal Article
Abstract: 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).
Issue Date: 18-Nov-2017
Date of Acceptance: 20-Oct-2017
URI: http://hdl.handle.net/10044/1/57270
DOI: https://dx.doi.org/10.1002/2017GL075108
ISSN: 0094-8276
Publisher: American Geophysical Union
Start Page: 11217
End Page: 11228
Journal / Book Title: GEOPHYSICAL RESEARCH LETTERS
Volume: 44
Issue: 22
Copyright Statement: ©2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
HUBBLE-SPACE-TELESCOPE
BURSTY BULK FLOWS
PI2 PULSATIONS
STATISTICAL-ANALYSIS
SUBSTORM ONSET
PLASMA SHEET
ALFVEN WAVES
MAGNETOSPHERE
RECONNECTION
MAGNETOPAUSE
MD Multidisciplinary
Meteorology & Atmospheric Sciences
Publication Status: Published
Open Access location: https://doi.org/10.1002/2017GL075108
Appears in Collections:Space and Atmospheric Physics
Physics



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