Subj : ES Picture of the Day 21  2022
To   : All
From : Dan Richter
Date : Wed Sep 21 2022 12:01:08

 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

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   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

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