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Simultaneous Cassini VIMS and UVIS observations of Saturn's southern aurora
Melin, H.; Stallard, T.; Miller, S. et al.
2011In EPSC-DPS Joint Meeting 2011
 

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Abstract :
[en] Here, temporally simultaneous and spatially overlapping Cassini VIMS and UVIS observations of Saturn's southern aurora are presented. The pointing is fixed at a constant local time of 04:55, covering latitudes between 64°S and 82°S and longitudes between 127° and 186°. The spatial resolution is high, with 1 mrad covering ˜300 km, such that only a small part of the pre-dawn aurora is observed. Ultraviolet auroral H and H2 emissions from UVIS are compared to infrared H+3 emission from VIMS. The auroral emission is structured into three arcs - H, H2 and H+3 are morphologically identical in the bright main auroral oval (˜73°S), but there is an equatorward arc that is seen predominantly in H (˜70°S), and a poleward arc (˜74°S) that is seen mainly in H2 and H+3 . These observations indicate that, for the main auroral oval, the UV emission is a good proxy for the infrared H+3 morphology (and vice versa), but for emission either poleward or equatorward this is no longer true. Hence, given the highly dynamic nature of the aurora of Saturn, simultaneous UV/IR observations are crucial for completing the picture of how the atmosphere interacts with the magnetosphere.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Melin, H.;  Department of Physics & Astronomy, University of Leicester, United Kingdom (h.melin@ion.le.ac.uk) ; Space Environment Technologies, Planetary and Space Science Division, Pacific Palisades, United States (h.melin@gmail.com)
Stallard, T.;  Department of Physics & Astronomy, University of Leicester, United Kingdom (h.melin@ion.le.ac.uk)
Miller, S.;  University College London, UK
Gustin, Jacques ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des atmosphères et des environnements planétaires
Galand, M.;  Imperial College, UK
Badman, S. V.;  JAXA Institute of Space and Astronautical Science, Japan
Pryor, W.;  Space Environment Technologies, Planetary and Space Science Division, Pacific Palisades, United States (h.melin@gmail.com) ; Central Arizona College, USA
O'Donoghue, J.;  Department of Physics & Astronomy, University of Leicester, United Kingdom (h.melin@ion.le.ac.uk)
Brown, R. H.;  University of Arizona, USA
Baines, K. H.;  )
Language :
English
Title :
Simultaneous Cassini VIMS and UVIS observations of Saturn's southern aurora
Publication date :
01 October 2011
Event name :
EPSC-DPS Joint Meeting 2011
Event date :
2-7 October 2011
Main work title :
EPSC-DPS Joint Meeting 2011
Pages :
1764
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since 06 August 2012

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