Io - an intense brightening near 5 micrometers

Details Io - an intense brightening near 5 micrometers Io - an intense brightening near 5 micrometers

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...203..643w&link_type=abstract

Science, vol. 203, Feb. 16, 1979, p. 643-646.

Physics

12

Brightness, Infrared Radiation, Io, Spectrophotometry, Albedo, Jupiter (Planet), Luminous Intensity, Thermoluminescence, Io, Satellites, Jupiter, Infrared, Brightness, Albedo, Phase Angles, Reflectivity, Transient Events, Flux, Spectrum, Luminescence, Hypotheses, Emissions, Spectrophotometry, Micrometers

Scientific paper

Spectrophotometric observations of the Jovian satellite Io on February 20 and 21, 1978, (Universal Time) were made from 1.2 to 5.4 micrometers. Io's brightness at 4.7 to 5.4 micrometers was found to be three to five times greater at an orbital phase angle of 68 deg than at orbital phase angles of 23 deg (5.5 hours before the brightening) and 240 deg (20 hours after the brightening). Since the 5-micrometer albedo of Io is near unity under ordinary conditions, the observed transient phenomenon must have been the result of an emission mechanism. Although several such mechanisms were examined, the actual choice is not clear.

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