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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 April 4   
      
                           A Vortex Aurora over Iceland   
                    Image Credit & Copyright: Christophe Suarez   
      
      Explanation: No, the car was not in danger of being vacuumed into space   
      by the big sky vortex. For one reason, the vortex was really an aurora,   
      and since auroras are created by particles striking the Earth from   
      space, they do not create a vacuum. This rapidly developing auroral   
      display was caused by a Coronal Mass Ejection from the Sun that passed   
      by the Earth closely enough to cause a ripple in Earth's magnetosphere.   
      The upper red parts of the aurora occur over 250 kilometers high with   
      its red glow created by atmospheric atomic oxygen directly energized by   
      incoming particles. The lower green parts of the aurora occur over 100   
      kilometers high with its green glow created by atmospheric atomic   
      oxygen energized indirectly by collisions with first-energized   
      molecular nitrogen. Below 100 kilometers, there is little atomic   
      oxygen, which is why auroras end abruptly. The concentric cylinders   
      depict a dramatic auroral corona as seen from the side. The featured   
      image was created from a single 3-second exposure taken in mid-March   
      over Lake Myvatn in Iceland.   
      
                         April is: Global Astronomy Month   
                       Tomorrow's picture: california seven   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
      
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