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Record Details

Record 1 of 10033
Io's Volcanism: Thermo-Physical Models of Silicate Lava Compared with Observations of Thermal Emission
External Online Source: doi:10.1006/icar.1996.0189
Author and Affiliation:
Davies, Ashely G.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA United States)
Abstract: Analyses of thermal infrared outbursts from the jovian satellite Io indicate that at least some of these volcanic events are due to silicate lava. Analysis of the January 9, 1990 outburst indicates that this was an active eruption consisting of a large lava flow (with mass eruption rate of order 10(exp 5) cubic m/sec) and a sustained area at silicate liquidus temperatures. This is interpreted as a series of fire fountains along a rift zone. A possible alternative scenario is that of an overflowing lava lake with extensive fire fountaining. The January 9, 1990 event is unique as multispectral observations with respect to time were obtained. In this paper, a model is presented for the thermal energy lost by active and cooling silicate lava flows and lakes on Io. The model thermal emission is compared with Earth-based observations and Voyager IRIS data. The model (a) provides an explanation of the thermal anomalies on Io's surface; (b) provides constraints on flow behavior and extent and infers some flow parameters; and (c) determines flow geometry and change in flow size with time, and the temperature of each part of the flow or lava lake surface as a function of its age. Models of heat output from active lava flows or inactive but recently emplaced lava flows or overturning lava lakes alone are unable to reproduce the observations. If the January 9, 1990 event is the emplacement of a lava flow, the equivalent of 27 such events per year would yield a volume of material sufficient, if uniformly distributed, to resurface all of Io at a rate of 1 cm/year.
Publication Date: Jan 01, 1996
Document ID:
19990110654
(Acquired Nov 26, 1999)
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Reprint
Publication Information: ICARUS (ISSN 0019-1035); Volume 124; 45-61
Publisher Information: Academic Press, Inc., United States
Financial Sponsor: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA United States
Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA United States
Organization Source: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA United States
Description: Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: IO; JUPITER (PLANET); IRIS SATELLITES; LAVA; VOLCANOES; THERMAL EMISSION; FLOW CHARACTERISTICS; FLOW GEOMETRY; FLUID FLOW; THERMAL ENERGY; INFRARED INTERFEROMETERS; INFRARED RADIATION; INFRARED SPECTROMETERS
Availability Source: Other Sources
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