Poster (Scientific congresses and symposiums)
Likely Detection of UV Auroral Emission from the Magnetic Footprint of Callisto
Clarke, John; Bhattacharyya, Dolon; Montgomery, Jordan et al.
2012AGU Fall Meeting 2012
 

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Keywords :
Callisto; Jupiter; aurora
Abstract :
[en] A large number of UV images of Jupiter's aurora were obtained in 2007/2008 with the Hubble Space Telescope (HST) ACS/SBC camera. The initial results on variations with the solar wind conditions have been published elsewhere, but the large database permits other studies to be performed. In particular, while auroral emissions have been detected from the magnetic footprints of Io, Europa, and Ganymede in Jupiter's atmosphere, the footprint of Callisto has been located too close to the main auroral oval to be detected. We have thus analyzed images of the ultraviolet auroral emissions of Jupiter taken using the F115LP filter on the HST/ACS instrument. Using a unique co-addition method, we have identified a strong candidate for the footprint of Callisto on May 24, 2007. We tested this finding by applying the same co-addition method to a nearly identical auroral configuration on May 30, 2007 when Callisto was well removed in its orbit. Comparing the two co-added images, we can clearly see the presence of Callisto’s footprint on the 24th and its absence on the 30th. The method relies as well on the motion of Callisto's footprint remaining under the satellite, while most of the auroral emissions rotate with the planet. The images and analysis method will be presented in this presentation.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Clarke, John;  Boston University > Center for Space Physics
Bhattacharyya, Dolon;  Boston University > Center for Space Physics
Montgomery, Jordan;  Boston University > Center for Space Physics
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des atmosphères et des environnements planétaires
Bonfond, Bertrand  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
Likely Detection of UV Auroral Emission from the Magnetic Footprint of Callisto
Publication date :
06 December 2012
Event name :
AGU Fall Meeting 2012
Event organizer :
American Geophysical Union
Event place :
San Francisco, United States - California
Event date :
from 03-12-2012 to 07-12-2012
Audience :
International
Available on ORBi :
since 15 January 2013

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