title: Galileo's First Images of Jupiter and the Galilean Satellites
abstract: The first images of Jupiter, Io, Europa, and Ganymede from the Galileo spacecraft reveal new information about Jupiter's Great Red Spot (GRS) and the surfaces of the Galilean satellites. Features similar to clusters of thunderstorms were found in the GRS. Nearby wave structures suggest that the GRS may be a shallow atmospheric feature. Changes in surface color and plume distribution indicate differences in resurfacing processes near hot spots on Io. Patchy emissions were seen while Io was in eclipse by Jupiter. The outer margins of prominent linear markings (triple bands) on Europa are diffuse, suggesting that material has been vented from fractures. Numerous small circular craters indicate localized areas of relatively old surface. Pervasive brittle deformation of an ice layer appears to have formed grooves on Ganymede. Dark terrain unexpectedly shows distinctive albedo variations to the limit of resolution.
authors.affiliation: M. J. S. Belton, National Optical Astronomy Observatories, 950 North Cherry Ave, Tucson, AZ 85719, USA|* To whom correspondence should be addressed. E-mail: belton@noao.edu
authors.forename: M J S
authors.initials: MJS
authors.lastname: Belton
authors.affiliation: J. W. Head III, R. Pappalardo, G. Collins, Department of Geological Science, Brown University, Providence, RI 02912, USA.
authors.forename: J W
authors.initials: JW
authors.lastname: Head
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authors.forename: A P
authors.initials: AP
authors.lastname: Ingersoll
authors.affiliation: R. Greeley and R. Sullivan, Department of Geology, Arizona State University, Tempe, AZ 85287-1414, USA.
authors.forename: R
authors.initials: R
authors.lastname: Greeley
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authors.forename: A S
authors.initials: AS
authors.lastname: McEwen
authors.affiliation: K. P. Klaasen, D. Senske, T. V. Johnson, G. S. Orton, R. A. West, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
authors.forename: K P
authors.initials: KP
authors.lastname: Klaasen
authors.affiliation: K. P. Klaasen, D. Senske, T. V. Johnson, G. S. Orton, R. A. West, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
authors.forename: D
authors.initials: D
authors.lastname: Senske
authors.affiliation: J. W. Head III, R. Pappalardo, G. Collins, Department of Geological Science, Brown University, Providence, RI 02912, USA.
authors.forename: R
authors.initials: R
authors.lastname: Pappalardo
authors.affiliation: J. W. Head III, R. Pappalardo, G. Collins, Department of Geological Science, Brown University, Providence, RI 02912, USA.
authors.forename: G
authors.initials: G
authors.lastname: Collins
authors.affiliation: A. P. Ingersoll and A. R. Vasavada, Department of Geology and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: A R
authors.initials: AR
authors.lastname: Vasavada
authors.affiliation: R. Greeley and R. Sullivan, Department of Geology, Arizona State University, Tempe, AZ 85287-1414, USA.
authors.forename: R
authors.initials: R
authors.lastname: Sullivan
authors.affiliation: D. Simonelli, J. Veverka, P. J. Gierasch, D. Banfield, M. Bell, J. A. Burns, P. Thomas, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
authors.forename: D
authors.initials: D
authors.lastname: Simonelli
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authors.lastname: Geissler
authors.affiliation: M. H. Carr, U.S. Geological Survey, Menlo Park, CA 94025, USA.
authors.forename: M H
authors.initials: MH
authors.lastname: Carr
authors.affiliation: M. E. Davies, RAND, Santa Monica, CA 90406, USA.
authors.forename: M E
authors.initials: ME
authors.lastname: Davies
authors.affiliation: D. Simonelli, J. Veverka, P. J. Gierasch, D. Banfield, M. Bell, J. A. Burns, P. Thomas, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
authors.forename: J
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authors.lastname: Veverka
authors.affiliation: D. Simonelli, J. Veverka, P. J. Gierasch, D. Banfield, M. Bell, J. A. Burns, P. Thomas, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
authors.forename: P J
authors.initials: PJ
authors.lastname: Gierasch
authors.affiliation: D. Simonelli, J. Veverka, P. J. Gierasch, D. Banfield, M. Bell, J. A. Burns, P. Thomas, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
authors.forename: D
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authors.lastname: Banfield
authors.affiliation: D. Simonelli, J. Veverka, P. J. Gierasch, D. Banfield, M. Bell, J. A. Burns, P. Thomas, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
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authors.lastname: Bell
authors.affiliation: C. R. Chapman, Southwest Research Institute, Boulder, CO 80302, USA.
authors.forename: C R
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authors.lastname: Chapman
authors.affiliation: C. Anger, ITTRES Ltd, Calgary, Alberta TIY 5Z6, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Anger
authors.affiliation: A. S. McEwen, P. Geissler, R. Greenberg, Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 87721, USA.
authors.forename: R
authors.initials: R
authors.lastname: Greenberg
authors.affiliation: G. Neukum, Institute for Planetary Exploration, Deutsche Forschunganstalt für Luft und Raumfahrt, Berlin, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Neukum
authors.affiliation: C. B. Pilcher, National Aeronautical and Space Administration, Washington, DC 20546, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Pilcher
authors.affiliation: R. F. Beebe, Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA.
authors.forename: R F
authors.initials: RF
authors.lastname: Beebe
authors.affiliation: D. Simonelli, J. Veverka, P. J. Gierasch, D. Banfield, M. Bell, J. A. Burns, P. Thomas, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Burns
authors.affiliation: F. Fanale, Institute for Geophysics, University of Hawaii, Honolulu, HI 96822, USA.
authors.forename: F
authors.initials: F
authors.lastname: Fanale
authors.affiliation: W. Ip, Max Planck Institute für Aeronomie, Lindau, Germany. D. Morrison and J. Moore, NASA Ames Research Center, Moffett Field, CA 94035, USA.
authors.forename: W
authors.initials: W
authors.lastname: Ip
authors.affiliation: K. P. Klaasen, D. Senske, T. V. Johnson, G. S. Orton, R. A. West, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
authors.forename: T V
authors.initials: TV
authors.lastname: Johnson
authors.affiliation: M. J. S. Belton, National Optical Astronomy Observatories, 950 North Cherry Ave, Tucson, AZ 85719, USA
authors.forename: D
authors.initials: D
authors.lastname: Morrison
authors.affiliation: M. J. S. Belton, National Optical Astronomy Observatories, 950 North Cherry Ave, Tucson, AZ 85719, USA
authors.forename: J
authors.initials: J
authors.lastname: Moore
authors.affiliation: K. P. Klaasen, D. Senske, T. V. Johnson, G. S. Orton, R. A. West, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
authors.forename: G S
authors.initials: GS
authors.lastname: Orton
authors.affiliation: D. Simonelli, J. Veverka, P. J. Gierasch, D. Banfield, M. Bell, J. A. Burns, P. Thomas, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
authors.forename: P
authors.initials: P
authors.lastname: Thomas
authors.affiliation: K. P. Klaasen, D. Senske, T. V. Johnson, G. S. Orton, R. A. West, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: West