MSGID: 1:317/3 632b5165   
   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.   
      
      
    Triboluminescence Observed on Perito Moreno Glacier   
      
      September 21, 2022   
      
       Glaciar baja (1)   
      
      Photographer:  Rodrigo Terren   
      
      Summary Author:  Rodrigo Terren;  Jim Foster   
      
      The photo above shows an unusual  luminescent phenomenon observed   
      during the rupture of the glacier walls in a portion of the  Perito   
      Moreno Glacier in Chile. We were photographing this glacier one night   
      this past August (winter in Southern Hemisphere) when hearing a very   
      loud cracking sound, suddenly noticed that an area of the ice wall had   
      brightened – the white blotches on glacier at lower right center. It   
      remained illuminated for more than ten minutes. This brightening is   
      attributed to  triboluminescence. When a material, such as a quartz   
      crystal or even a life saver hard candy is pulled apart, crushed, or   
      snapped, light will sometimes be emitted. Though this phenomenon is   
      poorly understood and rarely observed on such a large scale, it seems   
      to be caused by the rapid separation and reunification of  static   
      electrical charges in some brittle solids.   
      
      The long exposure (several minutes) used to capture the brightening   
      results in the  star trails.   
      
      
      Perito Moreno Glacier, Chile Coordinates:  -50.469380, -73.029940   
      
      
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       More...   
      
   Cryosphere Links   
      
        *  Guide to Frost   
        *  What is the Cryosphere?   
        *  Bentley Snow Crystals   
        *  Glaciers of the World   
        *  Ice, Snow, and Glaciers: The Water Cycle   
        *  The National Snow and Ice Data Center Google Earth Images   
        *  Snow and Ice Crystals   
      
   -   
      Earth Science Picture of the Day is a service of the  Universities   
      Space Research Association.   
      
   https://epod.usra.edu   
       
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