This movie is taken by the X-ray Telescope onboard the Japanese Hinode satellite. It shows a clear S shaped structure that shines brightly in X-rays and then erupts to produce what is known as a coronal mass ejection (the eruption starts about 9 seconds into the movie). Coronal mass ejections are eruptions of magnetic field and electrically charged gas that race out into the Solar System and produce 'space weather' when they reach the Earth. These S shaped features have answered a long-standing mystery in solar physics - what is the configuration of the magnetic field just before it erupts? Using observations like this it has been realised that the magnetic field evolves to becomes a twisted bundle of magnetic field lines, like a rope. These magnetic ropes can then be studied, using observations and computer models, to understand the physical processes that lead to the eruption.
Image credit: JAXA/NASA/UK Space Agency