TY - JOUR
T1 - Temperature and area constraints of the South Volund Volcano on Io from the NIMS and SSI instruments during the Galileo G1 orbit
AU - Davies, Ashley Gerard
AU - McEwen, Alfred S.
AU - Lopes-Gautier, Rosaly M.C.
AU - Keszthelyi, Laszlo
AU - Carlson, Robert W.
AU - Smythe, William D.
PY - 1997
Y1 - 1997
N2 - 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.
AB - 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.
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U2 - 10.1029/97GL02310
DO - 10.1029/97GL02310
M3 - Article
AN - SCOPUS:0031252228
SN - 0094-8276
VL - 24
SP - 2447
EP - 2450
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 20
M1 - 97GL02310
ER -