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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.   
      
                                  2023 August 15   
      A body of water is seen in front of a night sky. The water reflects the   
        sky. In the sky, on the right are green aurora. In the center is an   
         orange plume. On the right are three while plumes. Please see the   
                    explanation for more detailed information.   
      
                      A Triply Glowing Night Sky over Iceland   
       Credit & Copyright: Wioleta Gorecka; Text: Natalia Lewandowska (SUNY   
                                      Oswego)   
      
      Explanation: The Sun is not the quiet place it seems. It expels an   
      unsteady stream of energetic electrons and protons known as the solar   
      wind. These charged particles deform the Earth's magnetosphere, change   
      paths, and collide with atoms in Earth's atmosphere, causing the   
      generation of light in auroras like that visible in green in the image   
      left. Earth itself is also geologically active and covered with   
      volcanoes. For example, Fagradalsfjall volcano in Iceland, seen   
      emitting hot gas in orange near the image center. Iceland is one of the   
      most geologically active places on Earth. On the far right is the   
      Svartsengi geothermal power plant which creates the famous human-made   
      Blue Lagoon, shown emitting white gas plumes. The featured composition   
      therefore highlights three different sky phenomena, including both   
      natural and human-made phenomena.   
      
                       Tomorrow's picture: a cosmic embrace   
        __________________________________________________________________   
      
          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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