Temperature and area constraints of the South Volund Volcano on Io from the NIMS and SSI instruments during the Galileo G1 orbit

Ashley Gerard Davies, Alfred S. McEwen, Rosaly M C Lopes-Gautier, Laszlo Keszthelyi, Robert W. Carlson, William D. Smythe

Research output: Contribution to journalArticle

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Abstract

Analysis of data from darkside and eclipse observations of Io by the NIMS and SSI instruments show that the South Volund hot spot is a manifestation of high temperature active silicate volcanism. The NIMS data are fitted with a two temperature model (developed from modelling terrestrial lavas) which yields a better fit to the data than a single temperature fit. The multispectral color temperatures obtained from NIMS are compared with the brightness temperatures obtained from the SSI instrument, and show excellent agreement for the hotter of the two components fitted to the NIMS data. The two components might correspond to a cooled crust which has formed on the surface of an active flow or lava lake, at a temperature of approximately 450 K, and covering an area of about 50 km2, and a hotter and much smaller component, at a temperature of approximately 1100 K and an area of less than 0.1 km2. The hot component implies the existence of cracks in the surface crust of a flow or lake through which the hot interior radiates, a hot vent area, or breakouts of lava forming new flow lobes. The ratio of these areas is consistent with the crack-to-crust ratio of some lava flows and lava lakes on Earth.

Original languageEnglish (US)
Pages (from-to)2447-2450
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number20
StatePublished - 1997

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Io
volcanoes
lava
volcano
orbits
lakes
crusts
crust
temperature
lake
crack
cracks
vents
brightness temperature
eclipses
lava flow
lobes
hot spot
volcanism
silicates

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Davies, A. G., McEwen, A. S., Lopes-Gautier, R. M. C., Keszthelyi, L., Carlson, R. W., & Smythe, W. D. (1997). Temperature and area constraints of the South Volund Volcano on Io from the NIMS and SSI instruments during the Galileo G1 orbit. Geophysical Research Letters, 24(20), 2447-2450.

Temperature and area constraints of the South Volund Volcano on Io from the NIMS and SSI instruments during the Galileo G1 orbit. / Davies, Ashley Gerard; McEwen, Alfred S.; Lopes-Gautier, Rosaly M C; Keszthelyi, Laszlo; Carlson, Robert W.; Smythe, William D.

In: Geophysical Research Letters, Vol. 24, No. 20, 1997, p. 2447-2450.

Research output: Contribution to journalArticle

Davies, AG, McEwen, AS, Lopes-Gautier, RMC, Keszthelyi, L, Carlson, RW & Smythe, WD 1997, 'Temperature and area constraints of the South Volund Volcano on Io from the NIMS and SSI instruments during the Galileo G1 orbit', Geophysical Research Letters, vol. 24, no. 20, pp. 2447-2450.
Davies, Ashley Gerard ; McEwen, Alfred S. ; Lopes-Gautier, Rosaly M C ; Keszthelyi, Laszlo ; Carlson, Robert W. ; Smythe, William D. / Temperature and area constraints of the South Volund Volcano on Io from the NIMS and SSI instruments during the Galileo G1 orbit. In: Geophysical Research Letters. 1997 ; Vol. 24, No. 20. pp. 2447-2450.
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