This video is composed of images taken by satellite IRIS 24 Jul 2016. That day in the Sun, an outbreak of average power. In the video you can see the characteristic for this phenomenon hinges.
They are formed when the solar plasma follows along the lines of the magnetic field. In the process it is heated to a temperature of several million degrees. When a substance falls again to the surface of the Sun, its temperature sharply decreases to tens of thousands of degrees. This whole process looks something reminiscent of rain.