Infrared polarization measurements of Io in 1986

Details Infrared polarization measurements of Io in 1986 Infrared polarization measurements of Io in 1986

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1095s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Sept. 1988, p. 1095-1105.

Astronomy and Astrophysics

Astronomy

11

Infrared Astronomy, Io, Polarimetry, Sunlight, Albedo, Least Squares Method, Thermal Emission, Visible Spectrum, Volcanoes, Voyager Project

Scientific paper

New polarization measurements of Io were made with two different polarimeters at 3.8 and 4.8 μm. The measurements, at phase angles ≡2°, detect the polarization of reflected sunlight at both wavelengths. Only upper limits can be determined for the volcanic activity in 1986, but these limits show that there has been a remarkable decrease in activity, particularly of the Loki volcano, at these short wavelengths. The 1984 data (Goguen and Sinton, 1985) are reanalyzed with the new model, which includes polarization of reflected sunlight. The inclusion of this polarization makes only minor changes from the results of that paper. The large amount of thermal emission from the Loki volcano in 1984 produced a polarization that was dominant over that of reflected sunlight.

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