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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 April 19   
      Two people dressed in red coats are standing on a snowy landscape with   
       bare trees. Above, many aurorae of different colors appear, with some   
       stars visible in the background. Please see the explanation for more   
                               detailed information.   
      
                            Auroral Storm over Lapland   
         Image Credit & Copyright: Juan Carlos Casado (Starry Earth, TWAN)   
      
      Explanation: On some nights the sky is the best show in town. On this   
      night, auroras ruled the sky, and the geomagnetic storm that created   
      this colorful sky show originated from an increasingly active Sun.   
      Surprisingly, since the approaching solar CME the day before had missed   
      the Earth, it was not expected that this storm would create auroras. In   
      the foreground, two happily surprised aurora hunters contemplate the   
      amazing and rapidly changing sky. Regardless of forecasts, though,   
      auroras were reported in the night skies of Earth not only in the far   
      north, but as far south as New Mexico, USA. As captured in a wide-angle   
      image above Saariselk+ñ in northern Finnish Lapland, a bright aurora was   
      visible with an unusually high degree of detail, range of colors, and   
      breadth across the sky. The vivid yellow, green, red and purple auroral   
      colors are caused by oxygen and nitrogen atoms high in Earth's   
      atmosphere reacting to incoming electrons.   
      
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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