Volcanic activity on Io at the time of the Ulysses encounter

John R. Spencer, Robert R. Howell, Beth E. Clark, David R. Klassen, Daniel O'Connor

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The population of heavy ions in Io's torus is ultimately derived from Io volcanism. Ground-based infrared observations of Io between October 1991 and March 1992, contemporaneous with the 8 February 1992 Ulysses observations of the Io torus, show that volcanic thermal emission was at the low end of the normal range at all Io longitudes during this period. In particular, the dominant hot spot Loki was quiescent. Resolved images show that there were at least four hot spots on Io's Jupiter-facing hemisphere, including Loki and a long-lived spot on the leading hemisphere (Kanehekili), of comparable 3.5-micrometer brightness but higher temperature.

Original languageEnglish (US)
Pages (from-to)1507-1510
Number of pages4
JournalScience
Volume257
Issue number5076
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

Fingerprint

Dive into the research topics of 'Volcanic activity on Io at the time of the Ulysses encounter'. Together they form a unique fingerprint.

Cite this