  On 6 Sept. 2017, an exceptional coronal mass ejection departed from the Sun
toward the Earth and Uranus, whose magnetospheres are sensitive to the solar
wind. The resulting interplanetary shock triggered geomagnetic storm and
intense aurora at Earth the next day and was predicted by MHD models to reach
Uranus around 10-11 Nov. This event provided a unique opportunity to
investigate the auroral response of the asymmetric Uranian magnetosphere in its
intermediate equinox-to-solstice configuration. Coordinated multi-spectral
observations were acquired with the Hubble Space Telescope (HST) in the far-UV
(FUV), with the Very Large Telescope (VLT) and Gemini North in the near-IR
(NIR) and with Chandra in the X-ray domain. In this study, we focus on the
analysis of NIR images obtained between 9 and 17 Nov. 2017 which are compared
to one FUV image acquired on 11 Nov. The latter reveals a bright southern
auroral spot in the H2 bands, which we use as a reference to locate auroral
precipitations. The NIR images were aimed at mapping H3+ emission from the
Uranian ionosphere and at updating the results built from a couple of pioneer
images taken 25 years ago. These new high resolution images reveal H3+ from the
whole disc although brighter near the southern pole, but show no evidence of
localized auroral emission.
