Other
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985sci...230...65g&link_type=abstract
Science (ISSN 0036-8075), vol. 230, Oct. 4, 1985, p. 65-69.
Other
25
Infrared Photometry, Io, Linear Polarization, Planetary Composition, Polarimetry, Volcanoes, Basalt, Planetary Rotation, Refractivity, Sulfur, Temperature Distribution, Thermal Emission, Jupiter, Satellites, Io, Characteristics, Volcanism, Refractive Index, Polarimetry, Infrared, Wavelengths, Thermal Properties, Polarization, Emissions, Hot Spots, Rotation, Parameters, Models, Loki Patera, Ra Patera, Comparisons
Scientific paper
The thermal emission from Io's volcanic hot spots is linearly polarized. Infrared measurements at 4.76 micrometers show disk-integrated polarization as large as 1.6 percent. The degree and position angle of linear polarization vary with Io's rotation in a manner characteristic of emission from a small number of hot spots. A model incorporating three hot spots best fits the data. The largest of these hot spots lies to the northeast of Loki Patera, as mapped from Voyager, and the other spot on the trailing hemisphere is near Ra Patera. The hot spot on the leading hemisphere corresponds to no named feature on the Voyager maps. The value determined for the index of refraction of the emitting surface is a lower bound; it is similar to that of terrestrial basalts and is somewhat less than that of sulfur.
Goguen Jay D.
Sinton William M.
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