• ES Picture of the Day 02 2021

    From Black Panther@21:1/186 to All on Sat Jan 2 11:00:36 2021
    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.


    Archive - Virga and Rays

    January 02, 2021

    Virga2

    Every weekend we present a notable item from our archives. This EPOD
    was originally published January 2, 2004.

    Provided and copyright by: Peg Staudenmaier
    Summary author: Peg Staudenmaier

    The above photo shows a picturesque summer shower, captured last July
    about 80 miles or 128 km southwest of Edmonton, Alberta, Canada. This
    veil of precipitation actually evaporated before it reached the ground
    and is called virga. Also note the rays from the Sun (crepuscular
    rays), which appear to be escaping the heavy layer of altocumulus
    clouds, slanting in the opposite direction from the rain shaft. The
    weather on this day was typical of what we experienced while
    vacationing near the town of Bluffton, Alberta on July 1 (Canada Day).
    We were rewarded again, about half an hour after this picture was
    taken, with a delicate rainbow over the surrounding fields, all without
    having the holiday picnic rained out!


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    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

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  • From Black Panther@21:1/186 to All on Tue Feb 2 11:00:46 2021
    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.


    Solar Corona Observed in Fog at Nags Head, North Carolina

    February 02, 2021

    Sun_on_the_Sound_2020-11-26

    Photographer: Rob Bruner
    Summary Author: Rob Bruner
    While visiting the Outer Banks of North Carolina one day this past
    November, the weather was very foggy throughout the morning and
    into the afternoon. However, by midafternoon, the fog began to break
    up, and the Sun was partially visible, but then the fog quickly
    rolled back in, considerably reducing the visibility over Currituck
    Sound. As the fog reappeared, I could see a corona around the Sun,
    and then noticed its reflection near the shoreline. Fog is composed of
    water droplets that act to deflect ( diffraction process) light
    rather than reflect and refract it, as with raindrops, which may be
    up to 1,000 times smaller in diameter. Note that smaller droplets tend
    to result in larger diffraction angles and thus a larger corona. Make
    sure to protect your eyes when looking in the direction of the Sun.
    Photo taken on November 26, 2020.

    Photo Details: Camera: Apple iPhone 11; Software: PaintShop Pro 22.00;
    Exposure Time: 0.0001s (1/18868); Aperture: ƒ/1.8; ISO equivalent: 40;
    Focal Length (35mm): 26
    * Nags Head, North Carolina Coordinates: 35.914719, -75.605147

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    Atmospheric Effects Links

    * Atmospheric Optics
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    * 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 6 weeks, 6 days, 21 hours, 27 minutes
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  • From Black Panther@21:1/186 to All on Tue Mar 2 11:00:40 2021
    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.


    SpaceX Test Flight

    March 02, 2021

    Cesar rocket failure 25

    Photographer: Cesar Cantu
    Summary Author: Cesar Cantu

    Space conquest requires tests; many of them don't entirely succeed. On
    February 2, 2021, SpaceX launched the prototype Starship rocket
    seen above from its flight facility in Boca Chica, Texas. Initially,
    the silver booster achieved an altitude of approximately 6 miles (10
    km) as planned but the pilotless test flight ended with a spectacular
    explosion when the rocket failed to straighten out and crashed to earth
    tail-first.

    Photo Details: 14-tile composite image
    * South Padre Island, Texas Coordinates: 25.99639, -97.15719

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    Applied Sciences Links

    * BBC: World Water Crisis
    * Indoor Air Quality
    * Mathematics in Nature
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    * NASA: Applied Earth Sciences
    * Remote Sensing Tutorial

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

    https://epod.usra.edu

    --- up 10 weeks, 6 days, 21 hours, 27 minutes
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  • From Black Panther@21:1/186 to All on Fri Apr 2 11:00:44 2021
    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.


    Frost Pattern on Cold Window

    April 02, 2021

    035243255E634A4684822E8ECB91EB40 (1)

    Photographer: Mary Kelly
    Summary Authors: Mary Kelly; Jim Foster

    The photo above shows an elaborate frost pattern on a storm window
    in my home in Des Moines, Iowa. It was snapped around midday on
    February 6, 2021. Fern-like frost patterns like this will often form on
    windowpanes once the outside air temperature drops below about 14
    degrees F (-10 C) if there's sufficient moisture (usually transferred
    from the inside of the house) to allow frost crystals to grow.

    Outside, the air temperature was 9 degrees F (-13 C). The inside
    temperature was about 66 degrees F (19 C), but on the second floor,
    where the window frost was prominent, it was probably cooler because
    the heating vents here aren’t very efficient. Worth noting, the
    humidity may have been somewhat higher than normal because the bathroom
    shower had been used earlier in the day. Also, it should be mentioned
    that the upstairs windows don’t completely latch. So it’s likely that
    the cold temperature of the indoor glass allowed moisture in the
    upstairs rooms to crystalize directly onto the windowpanes.
    * Des Moines, Iowa Coordinates: 41.5868, -93.6250

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    * 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

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

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Wed Jun 2 11:00:36 2021
    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.


    Interplay of Rocket Exhaust and its Reflection on Water

    June 02, 2021


    2T2A2047-Edit

    Photographer: Michael Seeley

    Summary Authors: Michael Seeley; Jim Foster

    Shown above is a 195-second exposure of the launch of a SpaceX
    Falcon9 rocket from Cape Canaveral, Florida. It was taken at
    4:28 a.m. (local time) on March 24, 2021. I chose my viewing position
    specifically to have water in view of the camera since I thought it
    would be glassy enough to mirror the launch and the rocket’s
    exhaust. As it turned out, the water, though not rough, was gently
    rolling, creating the curious squiggles in the foreground that caught
    my attention. This is something I hadn’t previously observed. The
    exhaust's reflection on the water is known as a glitter path. Like
    all such paths, it's composed of quickly moving points of light darting
    over the water's surface. However, the "squiggles" are akin to moon
    circles that can only be seen when the water surface is rippled. I find
    the interplay between the water and the rocket exhaust to be quiet
    mesmerizing.

    Cocoa Beach, Florida Coordinates: 28.3200, -80.6076


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  • From Black Panther@21:1/186 to All on Fri Jul 2 11:00:28 2021
    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.


    Annular Eclipse of June 10, 2021, Observed from Quebec

    July 02, 2021

    Ecl10juin21
    Ecl10juin21

    Photographer: Philippe Moussette

    Summary Author: Philippe Moussette & Cadan Cummings

    The phenomenon seen here is an annular solar eclipse, as observed
    from Quebec City, Quebec on June 10, 2021. Solar eclipses occur
    when the Moon passes in front of the Sun and casts a shadow onto the
    Earth. Depending on the alignment of the planetary bodies and the
    distance from the Earth to the Moon, this event can be one of three
    types- total, partial, or annular. In the case of the eclipse on
    June 10, 2021, the new Moon was too far away from the Earth to
    completely cover the Sun, therefore resulting in an annular eclipse.
    The Moon’s orientation and distance in relation to the Earth is
    continually changing due to its elliptical orbit. This orbit
    eccentricity and wobble is the reason solar eclipses do not occur
    every month.

    The top image shows a timelapse mosaic of the Moon passing in front of
    the solar disk. The partial shadow cast by the Moon’s disk is called
    the antumbra during an annular eclipse. Depending on your
    location’s latitude and longitude, the Moon’s coverage of the Sun
    varies with the point of maximum cover called the path of
    annularity. In the second picture, the annular eclipse is beginning
    shortly after sunrise over the St. Lawrence River.
    * Quebec City, Quebec Coordinates: 46.837661, -71.198527

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

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Mon Aug 2 11:00:48 2021
    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.


    Creating a Natural Abstract Photograph

    August 02, 2021


    Menashe_DSC_5806 (002)

    Photographer: Menashe Davidson

    Summary Author: Menashe Davidson

    The photo above shows a purple anemone flower as observed through
    water drops coating a sheet of clear plastic. It was taken in my
    home garden in Rishon LeZion, Israel. A water drop can act as a
    convex lens. Such lenses are thicker in the center than along
    their edges and can magnify and also distort objects placed behind
    them.

    Since I focused here in on a fragment of a natural scene in my garden,
    I purposely created a seemingly unreal impression from a real object --
    the anemone. So, it can be thought of as an abstract photograph that
    captures a sensation, a mood, but to create it I had to begin with
    something concrete, in this case with water drops and flowers. The
    drops beautifully reflect the world about the anemone. Click here
    to see a video of this phenomenon.


    * Rishon LeZion, Israel Coordinates: 31.9730, 34.7925

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

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Sat Oct 2 11:01:32 2021
    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.


    Archive - Gurgler Glacier

    October 02, 2021
    6a0105371bb32c970b01b7c85d7cfd970b

    Every weekend we present a notable item from our archives.

    This EPOD was originally published May 23, 2016.
    Photographer: Klaus Sandforth
    Summary Author: Klaus Sandforth

    May 2016 Viewer's Choice Shown above are several ski
    mountaineers entering the Gurgler Glacier in the Ötztaler Alpen
    (Eastern Alps) of Austria. What looks at first sight like a classic
    glacier snout is dead ice of the retreating Gurgler Glacier,
    not far from Schalfkogel Peak, where the group is heading to climb.
    Dead ice is forming in receding glacial environments, where
    distinct ice bodies get separated from the main glacier. Note the
    slightly stratified but mostly crystal clear ice here. The rippled
    surface texture might be caused by differential melting and
    sublimation due to warm air currents, particularly in spring and
    summer. The surface of the ice is perfectly smooth and appears to
    be polished. This structure is rather temporary and fragile as it
    developed only a few years ago and will likely fade away just as
    quickly. Our passage might seem dangerous, but during the winter season
    when temperatures are generally below freezing level, it’s a pretty
    safe place to stay.
    Like many glaciers in the Alps, the Gurgler Glacier lost much of
    its mass in the last 150 years and is now retreating on average a
    few tens of meters every year. Climate change and glacier retreat
    in the Alps has both ecological and economical impacts. Glaciers
    attract tourists and also provide natural water reservoirs and
    hydropower. Photo taken on March 17, 2015.
    Photo Details: Apple iPhone 4S back camera; 35 mm focal length; ƒ/2.4
    aperture; 1/1126 sec. exposure; ISO 50.
    * Gurgler Glacier, Austria Coordinates: 46.8193, 10.9756

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

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Tue Nov 2 11:00:34 2021
    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.


    The Diminutive and Prolific Common Duckweed

    November 02, 2021


    PattiW_DSC09886 (003)

    PattiW_DSC09921 (003)

    Photographer: Patti Weeks

    Summary Author: Patti Weeks

    The photo above at top shows tiny common duckweed plants floating
    on and around a decaying American lotus lily pad. They inhabit a
    shallow, still-water pond on the inland side of a boardwalk along the
    Pamlico River on the Washington, North Carolina waterfront. The bottom
    photo reveals a broader view of the extensive mat of duckweed, covering
    virtually the entire surface of the lily pond. Both photos were taken
    in September, 2021, at about the mid-life cycle of both plants.

    The common duckweed (Lemna minor), along with other duckweed
    species, is the smallest known flowering plant, and is native
    throughout most of Africa, Asia, Europe and North America. The
    individual plant has 1–4 flat, oval leaves that are only 1/8 to 1/4
    inch long (0.3 to 0.6 cm). Each plant has one single hanging root,
    and often contains a tiny hidden flower in a pouch-like sac. Its
    asexual reproduction is done by the intertwining of new stems from
    buds. Also, a turion can break from the parental stem and sink to the
    pond’s bottom to overwinter and resurface in the Spring to become a new
    bud.

    By November, the duckweed and the lotus’s decayed lily pads and seeds
    will have sunk to the bottom of the pond, and the plants will re-emerge
    in the Spring to start their life cycles again. Because of its rapid
    growth, duckweed can often be a nuisance in homeowners’ ponds, but
    it’s an important food source for waterfowl and fish. It’s used for
    livestock feed and can also be used as a bioremediator of
    environmental and wastewater pollutants. In addition, research shows
    that duckweed has promising value in the creation of biomedicines.

    Photo details: Top - SONY DSC-RX10 IV camera; 120.91 mm focal length;
    f/4; 1/1000 second exposure; ISO 100. Bottom - Same except 8.8 mm focal
    length.
    * Pamlico River, Washington, North Carolina Coordinates: 35.5523849
    - 77.0846757

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

    https://epod.usra.edu

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  • From Black Panther@21:1/186 to All on Thu Dec 2 11:00:30 2021
    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.


    Quebrada de las Conchas Nature Reserve

    December 02, 2021

    13(1)

    Photographer: Carlos Di Nallo

    Summary Author: Carlos Di Nallo; Cadan Cummings

    The photo above features the Quebrada de las Conchas- also called
    the Quebrada de Cafayate- nature reserve located in the province of
    Salta in Argentina. The roughly 96 square mile (25,000 hectare)
    reserve within the Calchaquíes Valleys is important to the fields
    of geology and paleontology as some of its features date back to the
    Cretaceous period. The ravine shown in the foreground of the photo
    is a landscape produced by tectonic activity that took place in the
    last two million years. The geology of the region was also largely
    shaped by tectonics combined with subsequent weathering and
    erosion. Numerous fossils continue to be discovered within the reserve
    including fossilized frogs, fish, and stromatolites. A recent
    discovery that adds to the cultural and archaeological significance of
    the area was the Inca Trail passed near to what is now Route 68
    in the nature reserve.
    * Quebrada de Cafayate, Salta, Argentina Coordinates: -26.005278,
    -65.798889

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

    https://epod.usra.edu

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