Calculated occultation profiles of Io and the hot spots

Alfred S. McEwen, Laurence A. Soderblom, Dennis L. Matson, Torrence V. Johnson, Jonathan I. Lunine

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Occultations of Io by other Galilean satellites in 1985 provide a means to locate volcanic hot spots and to model their temperatures. We have computed the expected time variations in the integral reflected and emitted radiation of the occultations as a function of wavelength (visual to 8.7µm). The best current ephemerides were used to calculate the geometry of each event as viewed from Earth. Visual reflectances were modeled from global mosaics of Io. Thermal emission from the hot spots was calculated from Voyager 1 IRIS observations and, for regions unobserved by IRIS, from a model based on the distribution of low‐albedo features. The occultations may help determine (1) the location and temperature distribution of Loki; (2) the source(s) of excess emission in the region from long 50° to 200°; and (3) the distribution of small, high‐temperature sources.

Original languageEnglish (US)
Pages (from-to)201-204
Number of pages4
JournalGeophysical Research Letters
Issue number3
StatePublished - Mar 1986
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences


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