Mars; proton aurora; Lyman alpha; solar activity; CME; CIR
Résumé :
[en] We report observations of the proton aurora at Mars, obtained with the Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) ultraviolet spectrograph on board Mars Express between 2004 and 2011. This is a third type of UV aurora that is discovered on Mars, in addition to the discrete and diffuse nightside aurora. It is observed only on the dayside as it is produced by the direct interaction of solar wind protons with the upper atmosphere. The auroral signature is an enhancement of the Lyman-α emission in the order of a few kilorayleighs. The proton aurora features peak emissions around 120 to 150 km. From the full SPICAM database, limb observations have been investigated and six clear cases have been found. We identify either coronal mass ejections and/or corotating interaction regions as triggers for each of these events.
Disciplines :
Aérospatiale, astronomie & astrophysique
Auteur, co-auteur :
Ritter, Birgit ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Hubert, Benoît ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Rodriguez, L.; Royal Observatory of Belgium, Brussels, Belgium
Montmessin, F.; LATMOS-CNRS/IPSL/Université de Versailles-St Quentin-en-Yvelines, Guyancourt, France)
Langue du document :
Anglais
Titre :
Observations of the Proton Aurora on Mars With SPICAM on Board Mars Express
Date de publication/diffusion :
01 janvier 2018
Titre du périodique :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Maison d'édition :
American Geophysical Union, Washington, Etats-Unis - District de Columbia
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