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The Hydrogen Upper Atmosphere of Uranus: Insights gained from Lyman Alpha Observations

Presentation #323.03 in the session Uranus and Neptune Systems (Poster)

Published onOct 23, 2023
The Hydrogen Upper Atmosphere of Uranus: Insights gained from Lyman Alpha Observations

Several aspects of Uranus’s upper atmosphere are not well understood. Voyager 2 revealed a substantial H exosphere above the H2 dominated upper atmosphere, extending several Uranus radii. In 1998 and 2011, Uranus was observed in ultraviolet wavelengths using Hubble Space Telescope’s STIS instrument in two observing campaigns (before and after equinox at Uranus). We analyzed this data at Lyman-alpha wavelength (121.56 nm) and did radiative transfer modeling to investigate the contributions of H2 and H to the observed emissions. We compare the two observations and interpret spatial profiles and differences between them using radiative transfer modeling.

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