Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8593s&link_type=abstract
Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8593-8620.
Astronomy and Astrophysics
Astronomy
45
Io, Planetary Geology, Planetology, Spaceborne Astronomy, Volcanoes, Albedo, Astronomical Photography, Ballistics, Brightness, Plumes, Sulfur, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Jupiter, Satellites, Io, Volcanism, Eruptions, Plumes?, Voyager 1, Voyager 2, Ejecta Blankets, Size, Velocity, Topography, Brightness, Distribution, Shape, Patterns, Deposits, Models, Shock, Deposition, Geology, Volatile Elements, Amirani Volcano, Volund Volcano, Sulfur, Loki Volcano, Surt Volcano, Pele Volcano, Prometheus
Scientific paper
Nine eruption plumes which were observed during the Voyager 1 encounter with Io are discussed. During the Voyager 2 encounter, four months later, eight of the eruptions were still active although the largest became inactive sometime between the two encounters. Plumes range in height from 60 to over 300 km with corresponding ejection velocities of 0.5 to 1.0 km/s and plume sources are located on several plains and consist of fissures or calderas. The shape and brightness distribution together with the pattern of the surface deposition on a plume 3 is simulated by a ballistic model with a constant ejection velocity of 0.5 km/s and ejection angles which vary from 0-55 deg. The distribution of active and recent eruptions is concentrated in the equatorial regions and indicates that volcanic activity is more frequent and intense in the equatorial regions than in the polar regions. Due to the geologic setting of certain plume sources and large reservoirs of volatiles required for the active eruptions, it is concluded that sulfur volcanism rather than silicate volcanism is the most likely driving mechanism for the eruption plumes.
Cook Allan F.
Hansen Charles
Schneider Nicholas M.
Strom Richard G.
Terrile Richard J.
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