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 Observed over San José Pinula, Guatemala

July 09, 2021


01 Arco Superior Tangente - 6 mayo 2021 por Fabriccio Díaz (EPOD)

Photographer: Fabriccio Díaz
Summary Author: Fabriccio Díaz
One morning several weeks ago, I captured this charming upper
tangent arc (top center) using a drone, near my home in San José
Pinula, Guatemala. These arcs are tangent to the 22-degree halo and
can only be seen when the Sun is relatively low in the sky. They take
shape when the hexagonal ice crystals that make up cirriform
clouds are oriented with their long axes more or less horizontal. So,
sunlight that enters one of the crystal’s side faces is refracted and
then exits an alternate side face. Note also the sundog to the
right of the Sun. Photo taken approximately 6:30 a.m. (local time) on
May 6,2021.

Photo details: ISO 100; f10; Mavic 2 Pro; Merged and edited in Adobe
Lightroom.
* San José Pinula, Guatemala Coordinates: 14.5448, -90.4102

Related EPODs

Upper Tangent Arc Observed over San José Pinula, Guatemala
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Moon over Annapolis Harbor Fall-streak and Circumzenithal Arc
Archive - Red Rose and Morning Dew
More...

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?

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

https://epod.usra.edu

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