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.


Colorful Clouds Observed at Sunset

December 22, 2022


CloudColors

Photographer: Spyros Antonopoulos
Summary Author: Spyros Antonopoulos

The photo above showing colorful cloud colors at sunset was taken near
Chalkeia, Greece. Of course, the color of a cloud depends primarily
upon the color of the light it receives. When the Sun is low in the
sky, because the path the Sun's rays take across the sky is longer
than if they were coming from straight above (zenith), the shorter
wavelength colors (greens and blues) tend to be scattered from our
view. This leaves the red, yellow and orange colors to paint any clouds
lying in the track of the Sun's lingering rays. The closer the Sun is
to the horizon, the longer the path-length of its rays, and thus the
redder the color. Photo taken on July 10, 2022.

Chalkeia, Greece Coordinates: 38.431270, 21.684530

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More...

Cloud Links

* Atmospheric Optics
* The Cloud Appreciation Society
* Cloud Atlas
* Color and Light in Nature

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

https://epod.usra.edu

--- up 42 weeks, 3 days, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Dust Devils on a Dry Lakebed

November 22, 2022


Dust-devils
Photographer: Dale Chadwick
Summary Author: Dale Chadwick
The photo above shows dust devils on a dry lakebed southwest of
Winnemucca, Nevada, as observed in the early afternoon of July 4, 2022.
I was about 2 to 3 miles (3-5 km) away from when I noticed dust and
sand swirling in the air. The largest of these devils appears to be
over 100 feet (30 m) high and perhaps 30 feet (9 m) in width. I was
surprised at how long they persisted -- visible for at least 10
minutes.

Dust devils occur when the surface becomes sufficiently heated to
form a weak updraft in the lower atmosphere, just above the ground.
Once formed, the little rotating column of air may twist
counterclockwise or clockwise and is typically barely strong enough to
lift grains of sand.

Photo details: Two views taken with a 300MM zoom lens.

Winnemucca, Nevada Coordinates:


Related EPODs

Dust Devils on a Dry Lakebed Moondog and Etna Lava Flow Two
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Hong Kong Dew Drops
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?

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

https://epod.usra.edu

--- up 38 weeks, 1 day, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

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.


Inferior Mirage of Amerigo Vespucci

October 21, 2022

Miraggio Inferiore amerigo L

Photographer: Marcella Giulia Pace

Summary Author: Marcella Giulia Pace

Shown above is a sailing ship, the Amerigo Vespucci, that was
miraged on the horizon of the Ragusa Coast of Sicily, Italy. This
photo was taken from the seafront of Marina di Ragusa (Sicily) at a
height of about 9 m, and therefore the visible horizon was about 10 km
distant. Thus, the Earth's curvature actually conceals most of the
ship. Layers of warm air, beneath layers of cooler air generated this
inferior mirage, in which the visible parts of the ship are flipped
downward. This “overturning” made the ship's bowsprit appear like a
great, open mouth advancing towards the sea.

Note that the "Amerigo Vespucci", an Italian military school ship,
dates from 1931. Click here to see a video of this mirage. Photo
taken on August 28, 2022.

Photo details: Nikon D750 camera; sigma 150-600mm lens; 1200 focal);
1/640 second exposure; f13; ISO 100.


Marina di Ragusa (Sicily), Italy Coordinates: 36.7834, 14.5520


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

https://epod.usra.edu

--- up 33 weeks, 5 days, 20 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)