The morphology of Saturn's ultraviolet auroral oval and its time variations
Global images of the FUV auroral emission surrounding Saturn's south pole have been obtained with Space Telescope Imaging Spectrograph (STIS) since 1998. During this period, the planet's tilt offered a nearly complete view of the south auroral oval. Several tens of images were obtained in...
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ftorbi:oai:orbi.ulg.ac.be:2268/34073 2024-10-13T14:10:50+00:00 The morphology of Saturn's ultraviolet auroral oval and its time variations Gérard, Jean-Claude Grodent, Denis Clarke, J. T. 2004 https://orbi.uliege.be/handle/2268/34073 en eng http://adsabs.harvard.edu/abs/2004cosp.35.1390G https://orbi.uliege.be/handle/2268/34073 info:hdl:2268/34073 COSPAR General assembly, Paris, France [FR] Saturn Hubble aurora Physical chemical mathematical & earth Sciences Space science astronomy & astrophysics Physique chimie mathématiques & sciences de la terre Aérospatiale astronomie & astrophysique conference paper not in proceedings http://purl.org/coar/resource_type/c_18cp info:eu-repo/semantics/conferencePaper 2004 ftorbi 2024-09-27T07:01:56Z Global images of the FUV auroral emission surrounding Saturn's south pole have been obtained with Space Telescope Imaging Spectrograph (STIS) since 1998. During this period, the planet's tilt offered a nearly complete view of the south auroral oval. Several tens of images were obtained in January 2004, concurrent with in situ measurements of the solar wind parameters made with instruments on board the Cassini probe. This unique set of auroral images includes time-tagged exposures providing information on fast time variations. A subset of collected images is used to define a quiet reference oval. This oval serves a framework to investigate local time and longitudinal variations of brightness and latitudinal motions of the oval, including variation of its radius. Occasionally, the oval is not closed, or reduces to a bright spot apparently as a consequence of enhanced solar wind pressure pulses reaching the front of the magnetosphere. Comparisons with terrestrial counterpart indicate that auroral substorms are not observed on the nightside oval. Instead, some features are seen to rotate with the planet as in the Jovian aurora. These characteristics will be compared with predictions of recent models describing the global current system coupling the magnetosphere and the ionosphere. In particular, the latitude of the oval, departure from corotation and the longitudinal brightness distribution can be used to test the paradigm that the main auroral oval maps to a region of enhanced field-aligned current and to improve current models. Conference Object South pole University of Liège: ORBi (Open Repository and Bibliography) South Pole Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Saturn Hubble aurora Physical chemical mathematical & earth Sciences Space science astronomy & astrophysics Physique chimie mathématiques & sciences de la terre Aérospatiale astronomie & astrophysique |
spellingShingle |
Saturn Hubble aurora Physical chemical mathematical & earth Sciences Space science astronomy & astrophysics Physique chimie mathématiques & sciences de la terre Aérospatiale astronomie & astrophysique Gérard, Jean-Claude Grodent, Denis Clarke, J. T. The morphology of Saturn's ultraviolet auroral oval and its time variations |
topic_facet |
Saturn Hubble aurora Physical chemical mathematical & earth Sciences Space science astronomy & astrophysics Physique chimie mathématiques & sciences de la terre Aérospatiale astronomie & astrophysique |
description |
Global images of the FUV auroral emission surrounding Saturn's south pole have been obtained with Space Telescope Imaging Spectrograph (STIS) since 1998. During this period, the planet's tilt offered a nearly complete view of the south auroral oval. Several tens of images were obtained in January 2004, concurrent with in situ measurements of the solar wind parameters made with instruments on board the Cassini probe. This unique set of auroral images includes time-tagged exposures providing information on fast time variations. A subset of collected images is used to define a quiet reference oval. This oval serves a framework to investigate local time and longitudinal variations of brightness and latitudinal motions of the oval, including variation of its radius. Occasionally, the oval is not closed, or reduces to a bright spot apparently as a consequence of enhanced solar wind pressure pulses reaching the front of the magnetosphere. Comparisons with terrestrial counterpart indicate that auroral substorms are not observed on the nightside oval. Instead, some features are seen to rotate with the planet as in the Jovian aurora. These characteristics will be compared with predictions of recent models describing the global current system coupling the magnetosphere and the ionosphere. In particular, the latitude of the oval, departure from corotation and the longitudinal brightness distribution can be used to test the paradigm that the main auroral oval maps to a region of enhanced field-aligned current and to improve current models. |
format |
Conference Object |
author |
Gérard, Jean-Claude Grodent, Denis Clarke, J. T. |
author_facet |
Gérard, Jean-Claude Grodent, Denis Clarke, J. T. |
author_sort |
Gérard, Jean-Claude |
title |
The morphology of Saturn's ultraviolet auroral oval and its time variations |
title_short |
The morphology of Saturn's ultraviolet auroral oval and its time variations |
title_full |
The morphology of Saturn's ultraviolet auroral oval and its time variations |
title_fullStr |
The morphology of Saturn's ultraviolet auroral oval and its time variations |
title_full_unstemmed |
The morphology of Saturn's ultraviolet auroral oval and its time variations |
title_sort |
morphology of saturn's ultraviolet auroral oval and its time variations |
publishDate |
2004 |
url |
https://orbi.uliege.be/handle/2268/34073 |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) |
geographic |
South Pole Hubble |
geographic_facet |
South Pole Hubble |
genre |
South pole |
genre_facet |
South pole |
op_source |
COSPAR General assembly, Paris, France [FR] |
op_relation |
http://adsabs.harvard.edu/abs/2004cosp.35.1390G https://orbi.uliege.be/handle/2268/34073 info:hdl:2268/34073 |
_version_ |
1812818367360270336 |