4 research outputs found
Prominence eruption observed in He II 304 Ă up to >6 Râ by EUI/FSI aboard Solar Orbiterâ
Aims. We report observations of a unique, large prominence eruption that was observed in the He II 304 Ă
passband of the Extreme Ultraviolet Imager/Full Sun Imager telescope aboard Solar Orbiter on 15â16 February 2022.
Methods. Observations from several vantage points â Solar Orbiter, the Solar-Terrestrial Relations Observatory, the Solar and Heliospheric Observatory, and Earth-orbiting satellites â were used to measure the kinematics of the erupting prominence and the associated coronal mass ejection. Three-dimensional reconstruction was used to calculate the deprojected positions and speeds of different parts of the prominence. Observations in several passbands allowed us to analyse the radiative properties of the erupting prominence.
Results. The leading parts of the erupting prominence and the leading edge of the corresponding coronal mass ejection propagate at speeds of around 1700 km sâ1 and 2200 km sâ1, respectively, while the trailing parts of the prominence are significantly slower (around 500 km sâ1). Parts of the prominence are tracked up to heights of over 6âRâ. The He II emission is probably produced via collisional excitation rather than scattering. Surprisingly, the brightness of a trailing feature increases with height.
Conclusions. The reported prominence is the first observed in He II 304 Ă
emission at such a great height (above 6 Râ)