| Auteur(s) supplémentaire(s) | C. Berland, N. André, R. Prangé, T. Fouchet, T. Encrenaz, E. Gendron, X. Hautbois |
Abstract | Late 2014, HST remotely observed the Uranus’ magnetosphere during strong wind shocks interactions with the STIS and COS instruments in the Far-UV. A COS high resolution spectrum was taken just after STIS imaged localized southern aurorae, a few 10 kR bright in the H2 bands, on 2 Nov. 2014. The analysis of this single spectrum reveals transient H2 auroral emissions, provides a measurement of the disc albedo beyond 170 nm (up to 210 nm) and brings new constraints on atmospheric hydrocarbons responsible for absorptions of the solar reflected spectrum at long wavelengths. A similar observing campaign of Uranus involving multi-spectral observations at Far-UV, Near-IR and X-ray wavelengths during active solar wind conditions was executed late 2017, when the planet reached an intermediate configuration between solstice and equinox. We will present the NIR images of the planet taken with VLT/NACO using adaptative optics and Gemini/NIRI which display extended H3+ emission regions.
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