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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                 2022 September 13   
      
                        A Long Snaking Filament on the Sun   
           Image Credit & Copyright: Alan Friedman (Averted Imagination)   
      
      Explanation: Earlier this month, the Sun exhibited one of the longer   
      filaments on record. Visible as the bright curving streak around the   
      image center, the snaking filament's full extent was estimated to be   
      over half of the Sun's radius -- more than 350,000 kilometers long. A   
      filament is composed of hot gas held aloft by the Sun's magnetic field,   
      so that viewed from the side it would appear as a raised prominence. A   
      different, smaller prominence is simultaneously visible at the Sun's   
      edge. The featured image is in false-color and color-inverted to   
      highlight not only the filament but the Sun's carpet chromosphere. The   
      bright dot on the upper right is actually a dark sunspot about the size   
      of the Earth. Solar filaments typically last from hours to days,   
      eventually collapsing to return hot plasma back to the Sun. Sometimes,   
      though, they explode and expel particles into the Solar System, some of   
      which trigger auroras on Earth. The pictured filament appeared in early   
      September and continued to hold steady for about a week.   
      
                      Tomorrow's picture: waving space lizard   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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