Spectroscopic Imaging of the Atmosphere of Callisto

Computer Science

Scientific paper

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Hst Proposal Id #9056 Solar System

Scientific paper

We propose to obtain long-slit imaging ultraviolet spectra of Callisto, using STIS with the G140L grating, to study the interaction of the Jovian plasma environment with the tenuous carbon dioxide atmosphere of this icy satellite. This spectral range is rich in emissions of CO, ionC1, ionC2, and ionO1 characteristic of CO_2 atmospheres. Recent Galileo measurements of atmospheric CO_2 infrared limb emission and the plasma density and magnetic field in the vicinity of Callisto suggest that Callisto should show emission brightness comparable to Europa and Ganymede, both of which have been successfully imaged in ultraviolet ionO1 emission by STIS.

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