Caption :Arc-like solar prominences like these form when hot gaseous matter erupts from the sun, then is drawn back to the solar surface by strong magnetic fields.

• 描述：5.；弧状日珥:当太阳喷发出炙热气体物质，然后这些物质又被强磁场吸引回太阳表面时，就会出现像图片中的这种弧状日珥。