My group conducts regular observations at McDonald Observatory, and we have also observed from Mount Wilson Observatory, Table Mountain Observatory, Mount Haleakala (Hawaii), and Australia. Observational results to which I have contributed include the first images of cometary sodium tails (Hyakutake and Hale-Bopp), the discovery of the Moon's sodium tail, the first known correlation between Io's sodium clouds and Io's volcanic activity, and one of the best-to-date groundbased images of Mercury.
Numerical modeling results include the demonstrations of molecular pickup ion production at Io, the escape of Io's ionosphere, and the brightening of the lunar sodium tail due to the Leonid meteor shower.
Io
Models of Io's sodium clouds
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Comets
Three tails of Comet Hale Bopp (1998, GRL)
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The Moon
The Moon's sodium tail
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Mercury
High resolution images of Mercury's surface
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