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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 March 28   
      A distant sunset is seen between an orange sky and dark clouds. A close   
        look at the Sun shows it is topped with several green strips, each   
       known as a green flash. Please see the explanation for more detailed   
                                   information.   
      
                           A Multiple Green Flash Sunset   
      Image Credit & Copyright: T. Slovinsk+' & P. Hor+ílek (IoP Opava); CTIO,   
                                NOIRLab, NSF, AURA   
      
      Explanation: Yes, but can your green flash do this? A green flash at   
      sunset is a rare event that many Sun watchers pride themselves on   
      having seen.  Once thought to be a myth, a green flash is now   
      understood to occur when the Earth's atmosphere acts like both a prism   
      and a lens. Different atmospheric layers create altitude-variable   
      refraction that takes light from the top of the Sun and disperses its   
      colors, creates two images, and magnifies it in just the right way to   
      make a thin sliver appear green just before it disappears. Pictured,   
      though, is an even more unusual sunset. From the high-altitude Cerro   
      Tololo Inter-American Observatory in Chile one day last April, the Sun   
      was captured setting beyond an atmosphere with multiple distinct   
      thermal layers, creating several  mock images of the Sun.  This time   
      and from this location, many of those layers produced a green flash   
      simultaneously. Just seconds after this multiple-green-flash event was   
      caught by two well-surprised astrophotographers, the Sun set below the   
      clouds.   
      
                       Tomorrow's picture: dolphin vs cloud   
        __________________________________________________________________   
      
          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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