Infrared observations of eclipses of Io, its thermophysical parameters, and the thermal radiation of the Loki volcano and environs

Details Infrared observations of eclipses of Io, its thermophysical parameters, and the thermal radiation of the Loki volcano and environs Infrared observations of eclipses of Io, its thermophysical parameters, and the thermal radiation of the Loki volcano and environs

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988icar...75..207s&link_type=abstract

Icarus (ISSN 0019-1035), vol. 75, Aug. 1988, p. 207-232.

Physics

24

Infrared Telescopes, Io, Planetary Radiation, Thermal Radiation, Thermophysical Properties, Volcanoes, Bolometers, Eclipses, Infrared Radiation, Jupiter (Planet), Lava, Least Squares Method, Voyager Project

Scientific paper

Observations of Io during eclipses by Jupiter in 1981-1984 are reported. Data obtained at 3.45-30 microns using bolometer system No. 1 on the 3-m IRTF telescope at Mauna Kea are presented in extensive tables and graphs and analyzed by means of least-squares fitting of thermophysical models to the eclipse cooling and heating curves, thermal-radiation calculations for the Io volcanoes, and comparison with Voyager data. Best fits are obtained for a model comprising (1) a bright region with a vertically inhomogeneous surface and (2) a dark vertically homogeneous region with thermal inertia only about 0.1 times that of (1). Little evidence of volcanic-flux variability during the period is found, and the majority (but not all) of the excess thermal IR radiation in the sub-Jovian hemisphere is attributed to the Loki volcano and its lava lake.

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