[en] During the Juno orbit 34 Ganymede encounter, the ultraviolet spectrograph mapped UV sunlight reflected by Ganymede from a closest approach altitude of 1,044 km, allowing us to study spatial variations
in Ganymede's far ultraviolet reflectance at higher resolution than has previously been possible. We find that a characteristic signature of water ice seen around 165 nm in laboratory spectra is absent over much of
the observed area, but is detectable in the north high latitude region. We suggest that the spectral difference between the high latitudes and other icy regions, such as Tros crater, may be explained by the presence of
additional UV-absorbing contaminants such as NH3 at lower latitudes. We also note a decrease in the relative reflectance of the high latitude regions at wavelengths >190 nm, which may be the start of a previously observed ozone absorption feature.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Molyneux, P. M. ; Southwest Research Institute San Antonio TX USA
Greathouse, T. K. ; Southwest Research Institute San Antonio TX USA
Gladstone, G. R. ; Southwest Research Institute San Antonio TX USA ; University of Texas at San Antonio San Antonio TX USA
Versteeg, M. H. ; Southwest Research Institute San Antonio TX USA
Hue, V. ; Southwest Research Institute San Antonio TX USA
Kammer, J. ; Southwest Research Institute San Antonio TX USA
Davis, M. W. ; Southwest Research Institute San Antonio TX USA
Bolton, S. J. ; Southwest Research Institute San Antonio TX USA
Giles, R. ; Southwest Research Institute San Antonio TX USA
Connerney, J. E. P. ; Space Research Corporation Annapolis MD USA
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
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