[en] The two main ultraviolet-signatures resulting from the Io-magnetosphere interaction are the local auroras on Io's atmosphere, and the Io footprints on Jupiter. We study here how Io's daily eclipses affect the footprint. Previous observations showed that its atmosphere collapses in eclipse. While remote observers can observe Io's local auroras briefly when Io disappears behind Jupiter, Juno is able to follow the Io footprint in the unlit hemisphere. Theoretical models of the variability of the energy flux fed into the Alfvén wings, ultimately powering the footprints, are not sufficiently constrained by observations. For the first time, we use observations of Io's footprint from the Ultraviolet Spectrograph (UVS) on Juno recorded as Io went into eclipse. We benchmark the trend of the footprint brightness using observations by UVS taken over Io's complete orbit and find that the footprint emitted power variation with Jupiter's rotation shows fairly consistent trends with previous observations. Two exploitable data sets provided measurements when Io was simultaneously in eclipse. No statistically significant changes were recorded as Io left and moved into eclipse, respectively, suggesting either that (i) Io's atmospheric densities within and outside eclipse are large enough to produce a saturated plasma interaction, that is, in the saturated state, changes in Io's atmospheric properties to first order do not control the total Alfvénic energy flux, (ii) the atmospheric collapse during the Juno observations was less than previously observed, or (iii) additional processes of the Alfvén wings in addition to the Poynting flux generated at Io control the footprint luminosity. <P />
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hue, V.; Southwest Research Institute, San Antonio, TX USA
Greathouse, T. K.; Southwest Research Institute, San Antonio, TX USA
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Saur, J.; Institut für Geophysik und Meteorologie, Universität zu Köln, Cologne, Germany
Gladstone, G. R.; Southwest Research Institute, San Antonio, TX USA ; Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX USA
Roth, L.; School of Electrical Engineering, Royal Institute of Technology KTH, Stockholm, Sweden
Davis, M. W.; Southwest Research Institute, San Antonio, TX USA
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) > Labo de physique atmosphérique et planétaire (LPAP)
Kammer, J. A.; Southwest Research Institute, San Antonio, TX USA
Szalay, J. R.; Department of Astrophysical Sciences, Princeton University, Princeton, NJ USA
Versteeg, M. H.; Southwest Research Institute, San Antonio, TX USA
Bolton, S. J.; Southwest Research Institute, San Antonio, TX USA
Connerney, J. E. P.; Space Research Corporation, Annapolis, MD USA ; NASA Goddard Spaceflight Center, Greenbelt, MD USA
Levin, S. M.; Jet Propulsion Laboratory, Pasadena, CA USA
Hinton, P. C.; Southwest Research Institute, San Antonio, TX USA ; Laboratory for Atmosphere and Space Physics, University of Colorado Boulder, Boulder, CO USA
Bagenal, F.; Southwest Research Institute, San Antonio, TX USA ; Laboratory for Atmosphere and Space Physics, University of Colorado Boulder, Boulder, CO USA)
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
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