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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 October 22   
      A landscape is pictured with snow and a line of evergreen trees. In the   
        sky is a field of stars but also notable green aurora. The largest   
        aurora appears similar in form to a Halloween ghost, Please see the   
                    explanation for more detailed information.   
      
                             Ghost Aurora over Canada   
                  Image Credit & Copyright: Yuichi Takasaka, TWAN   
      
      Explanation: What does this aurora look like to you? While braving the   
      cold to watch the skies above northern Canada early one morning in   
      2013, a most unusual aurora appeared. The aurora definitely appeared to   
      be shaped like something, but what? Two ghostly possibilities recorded   
      by the astrophotographer were "witch" and "goddess of dawn", but please   
      feel free to suggest your own Halloween-enhanced impressions.   
      Regardless of fantastical pareidolic interpretations, the pictured   
      aurora had a typical green color and was surely caused by the   
      scientifically commonplace action of high-energy particles from space   
      interacting with oxygen in Earth's upper atmosphere. In the image   
      foreground, at the bottom, is a frozen Alexandra Falls, while evergreen   
      trees cross the middle.   
      
      Help Wanted: Professional-astronomer level guest writers and assistant   
                                 editors for APOD   
                         Tomorrow's picture: Io from Juno   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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