MSGID: 1:317/3 62e814e5   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    EPOD - a service of USRA   
      
   The Earth Science Picture of the Day (EPOD) highlights the diverse processes   
   and phenomena which shape our planet and our lives. EPOD will collect and   
   archive photos, imagery, graphics, and artwork with short explanatory   
   captions and links exemplifying features within the Earth system. The   
   community is invited to contribute digital imagery, short captions and   
   relevant links.   
      
      
    Atacama Desert and Volcanic Twilight   
      
      August 01, 2022   
      
      
       DuskOnMarsWSMALLer   
      
      Photographer:  Tomas Slovinsky   
      Summary Author:  Tomas Slovinsky;  Jim Foster   
      
      The photo above showing a reddened twilight sky over a barren landscape   
      comes from San Pedro de Atacama, Chile. It was taken on April 22, 2022.   
      The  Atacama Desert is almost at the same latitude as the  Tonga   
      Volcano that erupted in December of 2021. Throughout the autumn months   
      (spring in the Northern Hemisphere), during each twilight period the   
      sky was imbued with deep red colors as  volcanic ash in the upper   
      atmosphere acted to increase the pathlength of sunlight (and   
      moonlight), thereby effectively extinguishing the shorter wavelength   
      colors from our view.   
      
      In many ways, the resulting landscape/nightscape resembled that of   
       Mars at sunset. Also found in the Atacama are ancient, dry   
      riverbeds, not too dissimilar from  the ones discovered on Mars,   
      where water once flowed in the past. On evenings such as this, you   
      could almost imagine that you were on the Red Planet. Note that the   
      patch of light at right center, to the right of the Milky Way, is the   
       Large Magellanic Cloud.   
      
      
      San Pedro de Atacama, Chile Coordinates: -22.9087, -68.1997   
      
      
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       More...   
      
   Atmospheric Effects Links   
      
        *  Atmospheric Optics   
        *  Optic Picture of Day: Gruppo Astrofili Galileo Galilei   
        *  Color and Light in Nature   
        *  The Colors of Twillight and Sunset   
        *  Refraction Index   
        *  Image Gallery: Atmospheric Effects   
        *  What is a Rainbow?   
      
   -   
      Earth Science Picture of the Day is a service of the  Universities   
      Space Research Association.   
      
   https://epod.usra.edu   
       
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