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Title:
Estimating eruption temperature from thermal emission spectra of lava fountain activity in the Erta'Ale (Ethiopia) volcano lava lake: Implications for observing Io's volcanoes
Authors:
Davies, Ashley Gerard; Keszthelyi, Laszlo; McEwen, Alfred S.
Affiliation:
AA(Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA); AB(Astrogeology Science Center, U.S. Geological Survey, Flagstaff, Arizona, USA); AC(Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona, USA)
Publication:
Geophysical Research Letters, Volume 38, Issue 21, CiteID L21308 (GeoRL Homepage)
Publication Date:
11/2011
Origin:
AGU
AGU Keywords:
Planetary Sciences: Comets and Small Bodies: Volcanism (5480, 8450), Planetary Sciences: Solar System Objects: Io, Volcanology: Planetary volcanism (5480, 6063, 8148), Volcanology: Remote sensing of volcanoes (4337), Volcanology: Instruments and techniques
Abstract Copyright:
(c) 2011: American Geophysical Union
DOI:
10.1029/2011GL049418
Bibliographic Code:
2011GeoRL..3821308D

Abstract

We have analysed high-spatial-resolution and high-temporal-resolution temperature measurements of the active lava lake at Erta'Ale volcano, Ethiopia, to derive requirements for measuring eruption temperatures at Io's volcanoes. Lava lakes are particularly attractive targets because they are persistent in activity and large, often with ongoing lava fountain activity that exposes lava at near-eruption temperature. Using infrared thermography, we find that extracting useful temperature estimates from remote-sensing data requires (a) high spatial resolution to isolate lava fountains from adjacent cooler lava and (b) rapid acquisition of multi-color data. Because existing spacecraft data of Io's volcanoes do not meet these criteria, it is particularly important to design future instruments so that they will be able to collect such data. Near-simultaneous data at more than two relatively short wavelengths (shorter than 1 mum) are needed to constrain eruption temperatures. Resolving parts of the lava lake or fountains that are near the eruption temperature is also essential, and we provide a rough estimate of the required image scale.
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