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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 November 11   
      
                             The SAR and the Milky Way   
                      Image Credit & Copyright: Julien Looten   
      
      Explanation: This broad, luminous red arc was a surprising visitor to   
      partly cloudy evening skies over northern France. Captured extending   
      toward the zenith in a west-to-east mosaic of images from November 5,   
      the faint atmospheric ribbon of light is an example of a Stable Auroral   
      Red (SAR) arc. The rare night sky phenomenon was also spotted at   
      unusually low latitudes around world, along with more dynamic auroral   
      displays during an intense geomagnetic storm. SAR arcs and their   
      relation to auroral emission have been explored by citizen science and   
      satellite investigations. From altitudes substantially above the normal   
      auroral glow, the deep red SAR emission is thought to be caused by   
      strong heating due to currents flowing in planet Earth's inner   
      magnetosphere. Beyond this SAR, the Milky Way arcs above the cloud   
      banks along the horizon, a regular visitor to night skies over northern   
      France.   
      
                           Tomorrow's picture: snow day   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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