Variation in the H 3 + Emission of Uranus

Details Variation in the H 3 + Emission of Uranus Variation in the H 3 + Emission of Uranus

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474l..73l&link_type=abstract

Astrophysical Journal Letters v.474, p.L73

Astronomy and Astrophysics

Astronomy

15

Planets And Satellites: Individual Uranus, Infrared: Solar System, Atmospheric Effects

Scientific paper

Infrared images of Uranus, obtained in 1993 April, at wavelengths sensitive to the H3+ molecular ion, are presented. These show that spatial variation in the emission from the planet is discernible. Comparison with magnetic field modeling of Uranus indicates that sources of this variation may include auroral activity and other features, but the images show that the spatial variation is more limited than in the case of Jupiter. This conclusion is born out by spectra obtained on four consecutive nights during 1995 June, which show that the overall temporal variability of the H3+ emission is ~20%. Comparison of the 1995 June spectra with data obtained in 1992, and the 1993 images, shows that the overall brightness of H3+ emission of Uranus can vary by a factor of 2 on a timescale of years.

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