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Volcanic Activity at Tvashtar Catena, IoTvashtar Catena (63 N, 120 W) is one of the most interesting features on Io. This chain of large paterae (caldera-like depressions) has exhibited highly variable volcanic activity in a series of observations. Tvashtar is the type example of a style of volcanism seen only at high latitudes, with short-lived Pele-type plumes and short-lived by intense thermal events. Evidence for a hot spot at Tvashtar was first detected in an eclipse observation in April 1997 (orbit G7) by the Solid State Imager (SSI) on the Galileo Spacecraft. Tvashtar was originally targeted for observation at higher resolution in the close flyby in November 1999 (I25) because of its interesting large-scale topography. There are relatively few but generally larger paterae at high latitudes on Io. I25 images revealed a 25 km long, 1-2 km high lava curtain via a pattern of saturation and bleeding in the CCD image, which requires very high temperatures.
Document ID
20040058023
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Milazzo, M. P.
(Arizona Univ. Tucson, AZ, United States)
Keszthelyi, L. P.
(Geological Survey Flagstaff, AZ, United States)
Radebaugh, J.
(Arizona Univ. Tucson, AZ, United States)
Davies, A. G.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
McEwen, A. S.
(Arizona Univ. Tucson, AZ, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Lunar and Planetary Science XXXV: Io, with a Dash of Titan
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Public Use Permitted.
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