Io: Galileo evidence for major variations in regolith properties

Damon P. Simonelli, Joseph Veverka, Alfred S. McEwen

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Galileo SSI images taken at different times early in the Jupiter orbital tour show striking, widespread changes in Io's color and albedo patterns that result from observing the satellite's surface at different lighting and viewing geometries. Such changes indicate significant variations in the photometric or light-scattering behavior of the Ionian surface from region to region, and thereby provide strong evidence for major lateral variations in regolith properties. In particular, the regolith particles in Io's bright equatorial band appear to be larger than, or have a higher density of internal scatterers than, those in the satellite's higher-latitude regions. Such heterogeneity is not surprising on Io, given the rapid rate of volcanic resurfacing.

Original languageEnglish (US)
Article number97GL02506
Pages (from-to)2475-2478
Number of pages4
JournalGeophysical Research Letters
Issue number20
StatePublished - 1997

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)


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