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We report observations of a unique, large prominence eruption that wasobserved in the He II 304 {\AA} passband of the the Extreme UltravioletImager/Full Sun Imager telescope aboard Solar Orbiter on 15-16 February 2022.Observations from several vantage points (Solar Orbiter, the Solar-TerrestrialRelations Observatory, the Solar and Heliospheric Observatory, andEarth-orbiting satellites) were used to measure the kinematics of the eruptingprominence and the associated coronal mass ejection. Three-dimensionalreconstruction was used to calculate the deprojected positions and speeds ofdifferent parts of the prominence. Observations in several passbands allowed usto analyse the radiative properties of the erupting prominence. The leadingparts of the erupting prominence and the leading edge of the correspondingcoronal mass ejection propagate at speeds of around 1700 km/s and 2200 km/s,respectively, while the trailing parts of the prominence are significantlyslower (around 500 km/s). Parts of the prominence are tracked up to heights ofover $6 R_\sun$. The He II emission is probably produced via collisionalexcitation rather than scattering. Surprisingly, the brightness of a trailingfeature increases with height. The reported prominence is the first observed inHe II 304 {\AA} emission at such a great height (above 6 $R_\sun$).

Prominence eruption observed in He II 304 {\AA} up to $>6 R_\sun$ by EUI/FSI aboard Solar Orbiter