MSGID: 1:317/3 634d983d   
   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.   
      
      
    iridescent Clouds Observed from Tuen Mun, Hong Kong   
      
      October 17, 2022   
      
       20210923_Iridescent_Cloud_DSCN1216   
      
       TerryL_20220601_Iridescent_Pileus_Cloud_DSCN3143   
      
      Photographer:  Terry Lui   
      Summary Author:  Terry Lui;  Jim Foster   
      
      I observed these two  iridescent clouds on the same day, June 1,   
      2022, from Tuen Mun, Hong Kong. The cloud at top is likely an   
       altocumulus cloud in the incipient stage of formation, and the   
      cloud at bottom is a  pileus cloud. Both clouds show iridescence or   
      irisation because their cloud droplets are small (perhaps 1/100 the   
      size of a raindrop) and all are about the same size. The pastel colors   
      result from the process of  diffraction – light waves are interfered   
      with by the small droplets in such a way that orders of colors overlap   
      each other.   
      
      Tuen Mun, Hong Kong Coordinates: 22.3908, 113.9725   
      
      
   Related EPODs   
      
       iridescent Clouds Observed from Tuen Mun, Hong Kong  Dew Drops   
       Golden Cumulus Clouds over Mt Makiling at Sunrise  Thunderstorm   
      and Rainbow over Zagreb, Croatia  Etna Volcano at Night   
       Crepuscular Rays Observed from Turin, Italy   
       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?   
      
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      Earth Science Picture of the Day is a service of the  Universities   
      Space Research Association.   
      
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