• ES Picture of the Day 29 2021

    From Black Panther@21:1/186 to All on Fri Jan 29 11:00:38 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.


    Kelvin-Helmholtz Clouds Over Albuquerque, New Mexico

    January 29, 2021

    KHclouds_1112201538b_HDR
    Photographer: Karen Roop
    Summary Authors: Karen Roop; Jim Foster

    Shown above are Kelvin-Helmholtz clouds that I photographed while
    at a stoplight in Albuquerque, New Mexico on November 12, 2020. They
    reminded me of ocean waves or a DNA strand. Sometimes called
    fluctus or billow clouds, they result from Kelvin-Helmholtz
    instabilities -- air in the layer containing the clouds is moving in a
    different direction and at a slower speed than the air in the layer
    just above the clouds. Though not uncommon, Kelvin-Helmholtz clouds
    usually only capture our attention when they're rather conspicuous, as
    they were on this mid-autumn day.

    Photo Details: Camera: LG Electronics VS501; Software: Windows Photo
    Editor 10.0.10011.16384; Exposure Time: 0.0011s (1/942); Aperture:
    ƒ/2.2; ISO equivalent: 50; Focal Length: 3.7mm
    * Albuquerque, New Mexico Coordinates: 35.0844, -106.6504

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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

    --- up 6 weeks, 2 days, 21 hours, 27 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Mon Mar 29 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 Halo and Lunar Halo Observed from Zsámbék, Hungary

    March 29, 2021

    Halos_of_january_abraham

    Photographer: Tamas Abraham
    Summary Author: Tamas Abraham; Jim Foster

    Featured above are two photos of 22-degree halos that I observed
    from Zsámbék, Hungary, a few weeks back. The top photo shows a solar
    halo taken on January 18, 2021. At center are the ruins of the 900-year
    old Premontre monastery church that was used here to mask the
    Sun, permitting the halo itself to be more easily seen. The lower photo
    shows a lunar halo taken on January 25. Note that the stars of
    Orion are twinkling through the halo at the 4:00 position.

    Whether observed at night or day, 22-degree halos (22-degrees is the
    halo’s radius) form when randomly oriented, pencil-shaped ice
    crystals refract sunlight or moonlight. On occasion, these crystals are
    free-falling in the atmosphere but most often they compose cirrus
    clouds. In order for the complete halo to be seen, the Sun or Moon
    must be at least 22-degrees above the horizon.

    Photo Details: Canon EOS 400D camera; Canon EF-S 10-22 USM lens.
    * Zsámbék, Hungary Coordinates: 47.5474, 18.7214

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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?

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

    https://epod.usra.edu

    --- up 3 days, 22 hours, 9 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Apr 29 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.


    M4 Globular Star Cluster - The Golden Globular

    April 29, 2021

    JohnC_M4Glob_30minChumackHRweb (004)

    Photographer: John Chumack
    Summary Author: John Chumack

    Early one morning a few weeks back I was able to observe the
    globular cluster shown above in the constellation of Scorpius.
    Designated as M4 or NGC 6121, my name for it is the Golden
    Globular. Discovered in 1764 by Philippe Loys de Chéseaux, M4 is
    visible through a small telescope or even binoculars (in dark skies),
    appearing as a fuzzy ball of light, subtending an area of the sky
    about the size of the full Moon. It’s approximately 75
    light-years across and some 7,200 light-years distant. Photo taken
    on March 7, 2021, from Dayton, Ohio.

    Photo Details: Explore Scientific 102 mm F7 telescope, FCD100 Triplet
    APO refractor scope; Bisque ME Mount; QHY183C Cooled Cmos Color Camera;
    6 x 300sec subs; 30-minute exposure total integration time. Seeing
    conditions were a a bit rough, but I did get a shot of M4 before the
    rising waning crescent Moon flooded the area with light.
    * Dayton, Ohio Coordinates: 39.7589, -84.1916

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    Night Sky Links

    * Space Weather Live
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    * About the Moon
    * American Meteor Society
    * Arbeitskreises Meteore e.V.
    * Global City Lights
    * Heavens Above Home Page
    * The International Meteor Organization
    * Lunar and Planetary Institute
    * MoonConnection
    * NASA Eclipse Web Page
    * Understanding The Moon Phases

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

    https://epod.usra.edu

    --- up 2 weeks, 1 day, 22 hours, 42 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Tue Jun 29 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.


    Air Pollution Woes

    June 29, 2021


    Tomas_PeopleLiveHereSMALL

    Photographer: Tomas Slovinsky
    Summary Author: Tomas Slovinsky

    For hundreds of thousands of years, the level of carbon dioxide in
    the atmosphere has been changing. But since the middle of 20th
    century, carbon dioxide from human activity has increased 250 times
    faster than it has from natural sources when the last Ice Age ended
    some 12,000 years ago.

    The Košice industrial complex of Slovakia (shown above with air
    pollution dimming the low-lying Sun) is largely dedicated to the
    metallurgy of iron, steel, and coke production. This complex is the
    primary industrial source of air pollution in Slovakia. In 2018
    Slovakia was reported as being the 10^th most polluted nation in
    Europe and the 40th most polluted nation in the world. However,
    actions are underway to promote cleaner air in Kosice and to
    improve air quality across Slovakia. Photo taken on April 9, 2020.
    * Veľká Ida (Kosice), Slovakia Coordinates: 48.5977, 21.1674

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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?

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

    https://epod.usra.edu

    --- up 7 weeks, 4 days, 12 hours, 15 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Jul 29 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.


    Alien Iceplants in California’s Half Moon Bay State Beach

    July 29, 2021

    HMBCal32c_6june21

    Photographer: Ray Boren

    Summary Author: Ray Boren

    Like botanically-based invaders in old science fiction movies (1951’s
    The Thing from Another World and the meteorite segment of George A.
    Romero’s Creepshow in 1982, starring horror writer Stephen King
    himself), pretty but relentless iceplants — succulents native
    to southern Africa — have been taking over the sandy marine terraces
    and dunes of California’s long Pacific Coast for more than a century.
    In the photograph here, taken early on the morning of June 6, 2021,
    yellow-flowered Carpobrotus edulis (sour fig) iceplants have even
    managed to find rootholds on the gray-weathered trunk of a long dead
    tree on Roosevelt Beach, part of the Golden State’s scenic Half
    Moon Bay State Beach.

    The California Department of Fish and Wildlife notes that iceplants,
    like the sour fig and the pink-to-magenta Carpobrotus chilensis
    (sea fig), were introduced in the early 1900s as groundcover to help
    prevent erosion and to stabilize railroad corridors, and later
    roadsides. Unfortunately, the agency says, the pervasive succulents
    thrived and spread easily in the familiar, temperate habitats.
    Although they continue to be used as garden ornamentals, and are still
    sold at nurseries, the creeping iceplants are now considered
    invasive in coastal California: Their colorful mats choke out
    indigenous — and often rare or endangered — plant species. Efforts
    are under way to remove, or at least stem, the carpet-like succulents
    in many locations, including along Half Moon Bay’s beautiful 4-mile
    (6.4-kilometer) stretch of white-sand beaches and the community’s paved
    bluff-top California Coastal Trail.
    * Half Moon Bay, California Coordinates: 37.487798, -122.454283

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    * Encyclopedia of Life - What is a Plant?
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    * University of Texas Native Plant Database
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    * What Tree is It?

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

    https://epod.usra.edu

    --- up 11 weeks, 6 days, 12 hours, 15 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sun Aug 29 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.


    Archive - Erta Ale, Ethiopia

    August 28, 2021

    6a0105371bb32c970b01b7c768d93c970b
    Every weekend we present a notable item from our archives.
    This EPOD was originally published April 7, 2015.

    Photographer: Joel Santos
    Summary Author: Joel Santos April 2015 Viewer's Choice

    Erta Ale is a continuously active, basaltic shield
    volcano in the Afar Region of northeastern Ethiopia. Its
    caldera is notable for holding one of world's longest-existing
    lava lakes -- first reported in 1906. Volcanoes with lava lakes are
    quite rare. Only six are known worldwide. The nearly full Moon, on
    the rise this early January night, illuminates the low clouds, acting
    to balance the light of the sky with the strong orange light of the
    bursting lava. Photo taken on January 10, 2015.

    Photo details: Fisheye lens; 8-15 mm; 85 sec exposure; f/4; ISO 400.
    * Erta Ale, Ethiopia Coordinates: 13.599722, 40.659722

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    Geology Links

    * Earthquakes
    * Geologic Time
    * Geomagnetism
    * General Dictionary of Geology
    * Mineral and Locality Database
    * Mohs Scale of Mineral Hardness
    * This Dynamic Earth
    * USGS
    * USGS Ask a Geologist
    * USGS/NPS Geologic Glossary
    * USGS Volcano Hazards Program

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

    https://epod.usra.edu

    --- up 16 weeks, 2 days, 12 hours, 15 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Wed Sep 29 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.


    Moonlight Silhouette of Erupting Volcán de Fuego and Acatenango

    September 29, 2021

    DSC_1313pj

    Photographer: David Rojas

    Summary Author: David Rojas; Cadan Cummings

    The impressive night photo above shows the Volcán de Fuego
    (“Volcano of Fire”) erupting next to a crescent moon visible
    momentarily before transiting behind the Acatenango Volcano.
    Located adjacent to the town of Antigua, Guatemala, Volcán de Fuego
    is a 12,346 ft (3,763 m) tall stratovolcano that has been erupting
    regularly since 2002. Together the Volcán de Fuego and neighboring
    Acatenango Volcano make up the complex named La Horqueta. The most
    recent series of severe eruptions occurred at Volcán de Fuego in
    1974 and 2018. Part of the most recent round of smaller
    eruptions, the photo above taken on July 17, 2021 shows an ash cloud
    rising above the volcano with small lava flows streaming down its side.
    The timing of this dramatic shot could not have been better with the
    moon’s disk visible at the edge of the volcanic cone and its light
    illuminating the silhouettes of both volcanoes.
    * San Cristóbal El Alto, Sacatepéquez, Guatemala Coordinates:
    14.4747, -90.8806

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    Geology Links

    * Earthquakes
    * Geologic Time
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    * General Dictionary of Geology
    * Mineral and Locality Database
    * Mohs Scale of Mineral Hardness
    * This Dynamic Earth
    * USGS
    * USGS Ask a Geologist
    * USGS/NPS Geologic Glossary
    * USGS Volcano Hazards Program

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

    https://epod.usra.edu

    --- up 3 weeks, 5 days, 21 hours, 55 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Fri Oct 29 11:00:32 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.


    Careful Where You Step

    October 29, 2021

    Dale_H_20210722_195455_resized (003)

    Photographer: Dale Hugo

    Summary Author: Dale Hugo; Jim Foster

    If you’re out trick-or-treating this weekend, be careful where you
    step. This gross looking slime mold is called Fuligo septica,
    but its common name is, appropriately, the dog vomit fungus. It’s an
    artillery fungus that loves to grow on rich, fertilized mulch that
    many landscapers use. If you’re bold enough to touch it, a cloud of
    reddish-brown spores explodes and then drifts in the wind.

    Fungi grows nearly everywhere. A type of fungus even grows between
    the windows of the International Space Station. More than 30,000
    species of fungi are known to exist, with most not yet properly
    identified or verified. It’s believed that the largest single organisms
    on Earth, by mass, are fungi. One large and in charge fungus underlies
    an entire forest in Michigan and weighs hundreds of tons.

    Surprisingly, there’s actually a type of slime mold capable of
    moving across the forest floor to reach and engulf its dinner.
    Now this is too scary even for Halloween. Photo taken in mid-July 2021,
    from Arlington Heights, Illinois.
    * Arlington Heights, Illinois Coordinates: 42.0884, -87.9806

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    * Discover Life
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    * What Tree is It?

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

    https://epod.usra.edu

    --- up 8 weeks, 21 hours, 55 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Mon Nov 29 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.


    Lunar Iridescent Clouds and Saturn

    November 29, 2021

    PSX_20210729_195745

    Photographer: Soumyadeep Mukjerjee

    Summary Author: Soumyadeep Mukjerjee; Cadan Cummings

    A unique combination of astronomy and atmospheric optics happened
    on July 24th, 2021 when the Full Moon passed within approximately 4
    degrees of Saturn and iridescent clouds treated night sky viewers
    to a spectacular display. In the image above, Saturn is seen toward
    the left of the image through thin clouds. The sky here in Kolkata,
    India was cloudy at moonrise, which turned out to be a blessing because
    the bright moonlight enabled beautiful rainbow-colored iridescent
    clouds to be visible. Iridescent clouds are a product of
    diffraction caused by similar sized water droplets or ice crystals
    in mid-altitude clouds that scatter light. They are mostly seen
    in daytime, so getting a glimpse of iridescent clouds at night is
    considered to be pretty rare. This specific event was especially
    noteworthy due to the variation of colors manifested in the clouds.

    Image Data: Nikon D5600, Laowa 100mm f/2.8 lens, ioptron Skyguider pro,
    ISO 100, 8 second exposure, 100mm, Adobe Camera Raw, Photoshop Express
    * Kolkata, India Coordinates: 22.5726, 88.3639

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

    https://epod.usra.edu

    --- up 2 weeks, 3 days, 16 hours, 25 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Wed Dec 29 11:00:54 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.


    Heiligenschein and Anticrepuscular Rays

    December 29, 2021

    Raggi-crepuscolari-con-Helig

    Photographer: Marco Meniero

    Summary Author: Marco Meniero

    On the morning of October 07 2021, I photographed anticrepuscular
    rays from the control tower of the airport at Viterbo, Italy. These
    rays, sometimes called antisolar rays, appear opposite of the Sun and
    converge at the antisolar point. So you must have your back to the Sun
    in order to see them.

    On both the top and bottom photos you can see a rather bright spot or
    patch of light (at the top of the shadow made by the control tower,
    where I'm standing with camera in hand) that follows me. When I looked
    to the right, the spot is seen on the right; when I looked to the left
    the spot was seen on the left. This spot is termed a
    Heiligenschein. It can be detected whenever dew drops form on
    various surfaces. The nearly spherical dew drops act as lenses to
    focus the light onto the surface behind them. When this
    light scatters or reflects off that surface, the same lens
    re-focuses that light into the direction from which it came. This
    configuration is sometimes called a cat's eye retroreflector. Any
    retroreflective surface is brightest around the antisolar point.
    * Viterbo, Italy Coordinates: 42.4207, 12.1077

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    Atmospheric Effects Links

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    * 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 3 weeks, 3 days, 20 hours, 43 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)