 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.


 Upper Tangent Arc and Sun Pillar Above Orsta, Norway

   March 04, 2021

    Geir_UTA_w010utangent01272021geirtbo-1024x759

   Photographer:  Geir T. Birkeland Øye
   Summary Authors:  Geir T. Birkeland Øye;  Jim Foster

   Shown above at top center is a rose-colored,  upper tangent arc that
   was observed over Ørsta, Norway, during the afternoon of January 27,
   2021. It appears to be tethered to a faint Sun  pillar. Tangent arcs
   are tangent to the  22-degree halo, which isn't visible in this
   photo. They form as sunlight enters a side face of a columnar shaped
   snow crystal (either  free-falling in the atmosphere or within a
    cirrus cloud) and then exits through an alternate side face. In
   order for this particular arc to take shape, the majority of the
    crystals need to be similarly oriented  -- their long axes are
   horizontally aligned as they fall.

   Photo Details: Canon 700D camera; Sigma 17-70 mm lens.
     * Ørsta, Norway Coordinates:  62.21247, 6.17056

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Atmospheric Effects Links

     *  Atmospheric Optics
     *  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.

https://epod.usra.edu
 
