• ES Picture of the Day 04 2021

    From Black Panther@21:1/186 to All on Mon Jan 4 11:00:56 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 Quadrantids

    January 04, 2021

    ColorfulQuadrantidsSMALLER

    Photographer: Tomas Slovinsky
    Summary Author: Tomas Slovinsky

    Shown above is a long-exposure image of the Quadrantid Meteor
    Shower as observed from Sardinia Island, Italy. The first meteor
    shower of the year, the Quadrantids can produce a handful or more of
    shooting stars every few minutes (120 per hour). But dark, moonless
    skies are a must. Additionally, since the peak of this shower lasts
    only for several hours, timing of when you observe is critical. Note
    that these meteors seem to emanate from the region of the sky near
    the constellation of Bootes which, when this image was captured,
    was still below the horizon. Take a look tonight.

    As shown above, the glow of the arching Milky Way stretches across
    nearly the entire sky. At bottom, two observers are awash in the
    zodiacal light; one appears to be pointing to Sirius, the
    brightest star in the night sky. Conspicuous Orion lies directly
    above Sirius. Note that the Big Dipper is reclining just above the
    rocky surface at lower center. Photo taken in early January 2020.
    * Sardinia, Italy Coordinates: 40.1209, 9.0129

    Related EPODs

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    Night Sky Links

    * Space Weather Live
    * Space Weather Live Forum
    * 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, 5 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 Thu Feb 4 11:00:42 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.


    Cerro Ventana, Argentina

    February 04, 2021

    Sierra de la Ventana

    Photographer: Cristian López
    Summary Author: Cristian López

    There are many rock formations named Cerro Ventana (Window Hill) around
    the world, the one seen here is part of the Ernesto Tornquist
    Provincial Park, in the province of Buenos Aires, Argentina. This
    formation is the product of a landslide and resembles a window 30 feet
    (9 m) wide and 36 feet (11 m) high on the top of the hill. A
    popular activity here is to climb to the 3,727-foot summit (1,136
    m) and take in the expansive view over the surrounding pampas. The
    hill is the namesake of the Sierra de la Ventana mountain range
    which was formed of Paleozoic rocks over 480 million years ago.
    Photo taken December 15, 2020.

    Photo Details: Camera: Canon EOS REBEL T3; Software: Adobe Photoshop
    22.1 (Windows); Exposure Time: 0.0025s (1/400); Aperture: ƒ/7.1; ISO
    equivalent: 125; Focal Length: 263.0mm; Lens: 70-300mm
    * Cerro Ventana, Argentina Coordinates: -38.048, -62.0173

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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 7 weeks, 1 day, 21 hours, 27 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Mar 4 11:00:42 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.


    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?

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

    https://epod.usra.edu

    --- up 11 weeks, 1 day, 21 hours, 27 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Tue May 4 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.


    Mammatus Clouds Observed over Berlin, Germany

    May 04, 2021


    Cumulonimbus Mammatus - Eric Maltz

    Photographer: Eric Maltz

    Summary Authors: Eric Maltz; Jim Foster

    These eye-catching mammatus clouds appeared just after a turbulent,
    late afternoon thunderstorm moved through Berlin, Germany, on March
    11, 2021. The pouches form when colder air moving downward within
    the cumulonimbus cloud structure pushes into the storm's cloud
    base. Mammatus are more often seen following a severe storm than
    preceding it.

    Berlin, Germany Coordinates: 52.5200, 13.4050

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    Severe Weather Links

    * World Severe Weather Information Center
    * Enhanced Fujita Scale
    * A Lightning Primer
    * More About Thunderstorms
    * Staying Safe Outdoors in Severe Weather
    * NOAA Storm Prediction Center
    * Patterns of Lightning Activity
    * US National Weather Service

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

    https://epod.usra.edu

    --- up 2 weeks, 6 days, 22 hours, 42 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Fri Jun 4 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.


    The Colorado Plateau and a Small Model of Subduction Compression

    June 04, 2021


    TomMc_EPOD.CottonwoodCanyonRoadUtah copy (005)

    TomMc_EPOD.DuctileAndBrittleFoldsPhylliteCT.WallRockB (005)

    Photographer: Thomas McGuire
    Summary Author: Thomas McGuire

    The cause of the uplift and the compressional features on the
    Colorado Plateau during the Laramide Orogeny (mountain building
    roughly 60 million years ago) were not understood until it was proposed
    that the Farallon Tectonic Plate is subducting at a low angle
    beneath the North American Plate. This is what raised the whole
    plateau. Additionally, compressional folding, including dozens
    of asymmetric folds ( Cockscomb, San Rafael Swell, Comb Ridge,
    Raplee Anticline, Waterpocket Fold, and many others) was caused by
    frictional drag with the remains of the subducting Farallon plate. Many
    of the folds are also related to sub-surface compressional
    faulting.

    Small scale rocks often reflect larger regional features. The top image
    is The Cockscomb monocline along Cottonwood Canyon Road in Utah.
    The second image is a rock from Connecticut. What is now western New
    England was an area of subduction in the closing of the Ordovician
    Pre-Atlantic Iapetus Ocean (about 400 million years ago), which
    created the Pangea land mass. This rock is a smaller-scale model of
    the Colorado Plateau’s asymmetric compressional folds, like The
    Cockscomb. My drawing on the image shows how this smaller rock
    represents The Cockscomb (a penny is used for scale).


    Cottonwood Canyon Road, Arizona Coordinates: 37.306608, - 111.886410


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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 4 weeks, 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 Jul 4 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.


    Archive - Washington, D.C. from Space

    July 03, 2021

    6a0105371bb32c970b011570af88e2970c-600wi

    Today's archive EPOD was selected because this weekend is Independence
    Day (July 4th) in the United States. Every weekend we present a notable
    item from our archives. This post was originally published July 3, 2009
    and was updated to reflect the anniversary.

    Landsat-7 Satellite Image
    Summary Author: Jim Foster

    The Landsat-7 satellite image above features the capital city of
    the U.S., Washington, D.C. Tomorrow, the U.S celebrates the 245th
    anniversary of its independence. From its inception, Washington,
    which sits at the confluence of the Potomac River (lower left) and
    Anacostia River (right center), was built to serve as the capital
    of the fledgling nation. Pierre Charles L’Enfant originally designed
    the layout of the city streets.

    The U.S. Capitol can be discerned near the center of the image, the
    Washington Monument and Lincoln Memorial are at left center – directly
    to the left (west) of the Capitol. Just southwest of the Lincoln
    Memorial, across the Potomac River in the state of Virginia, is the
    Arlington Memorial Cemetery. The emerald green peninsula to the south
    of the Capitol is East Potomac Park. At the top left of this image, the
    dark green strip is Rock Creek Park, which noticeably contrasts with
    the bright white of adjacent buildings and homes.
    The donut-like structure to the right (east) of the Capitol is Robert
    F. Kennedy Stadium. Portions of the state of Maryland can be seen at
    upper left and also at lower right.

    This is a natural-color image composed of several bands in the visible
    portion of the electromagnetic spectrum. Image acquired May 9, 2005.
    * Washington, District of Columbia Coordinates: 38.907, -77.037

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    Geography Links

    * Atlapedia Online
    * CountryReports
    * GPS Visualizer
    * Holt Rinehart Winston World Atlas
    * Mapping Our World
    * Perry-Castañeda Library Map Collection
    * Types of Land
    * World Mapper

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

    https://epod.usra.edu

    --- up 8 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 Aug 4 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.


    Spirit Lake in the Shadow of Mount St. Helens

    August 04, 2021

    B9D6569B-5CF9-4158-A9AD-4322661E81D3

    Photographer: Robert Forest

    Summary Author: Robert Forest; Cadan Cummings

    Shown in the image above is Spirit Lake located at the base of
    Mount St. Helens in Washington. The photo was oriented looking
    north from directly above the volcanic crater- with Mount Rainier
    visible in the distance. Following the eruption of Mount St. Helens
    in May 1980, approximately 15 billion cubic feet (430 million cubic
    meters) of material was deposited into Spirit Lake. This debris flow of
    melt water, vegetation, and volcanic ash- called a lahar-
    subsequently changed the natural flow of Spirit Lake by blocking its
    outlet to the North Fork Toutle River valley. Evidence of the
    debris is still present today as thousands of felled trees from the
    volcanic eruption formed a log raft- the gray colored material in the
    image above- that covers about a quarter of the lake.

    Following the eruption, Congress created the Mount St. Helens
    National Volcanic Monument in 1982 to allow scientific research to
    investigate how the surrounding landscape recovered naturally without
    the influences of logging or other industries. As a result, the logs in
    Spirit Lake and the surrounding area in the monument remains largely
    untouched for the past 40 years. While there has been a good regrowth
    of ground vegetation since the eruption, it will take a century or more
    for the rich forest to once again blanket the northern foothills of
    Mount St. Helens. Photo taken on May 29, 2021.
    * Spirit Lake, Washington Coordinates: 46.265940, -122.147142

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    Geography Links

    * Atlapedia Online
    * CountryReports
    * GPS Visualizer
    * Holt Rinehart Winston World Atlas
    * Mapping Our World
    * Perry-Castañeda Library Map Collection
    * Types of Land
    * World Mapper

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

    https://epod.usra.edu

    --- up 12 weeks, 5 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 Mon Oct 4 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.


    Lenticular Cloud Above Mount Aconcagua

    October 04, 2021

    Cerro Aconcagua

    Photographer: Cristian López

    Summary Author: Cristian López; Cadan Cummings

    Shown above is a photo of a lenticular cloud over Mount
    Aconcagua in Argentina. Unique in their flying saucer like appearance,
    lenticular clouds typically form over alpine climates when stable,
    moist air passes over a mountain peak and condenses once the water
    vapor falls below its dew point temperature. This distinct
    lens-shape is formed when the water vapor continues over the mountain
    peak and its temperature increases above the dew point, causing it to
    evaporate. The location for this spectacular phenomenon is also
    very noteworthy because the summit of Mount Aconcagua (22,837 ft or
    6,960 m) is the highest elevation point in both the Western and
    Southern Hemispheres as well as outside the Himalayas.

    Photo Details: Camera: Canon T3; Lens: 18-55 in 43mm, f/13, ISO: 100,
    Exposure: 1/320 second, Software: Adobe Photoshop
    * Aconcagua Provincial Park, Mendoza, Argentina Coordinates:
    -32.6532, -70.0120

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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 4 weeks, 3 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 Thu Nov 4 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.


    Double Rainbow over Freital, Germany

    November 04, 2021

    Rainbow-EPOD(1)

    Photographer: Heiko Ulbricht

    Summary Author: Heiko Ulbricht; Cadan Cummings

    Weather around the town of Freital in eastern Germany this past May
    felt like a continuation of the typical April spring weather- rain,
    sun, and brief thunderstorms. However, on the evening of May 16, 2021,
    a beautiful sight could be seen on the horizon after a rather large
    weather cell passed over from Freiburg, Germany. The weather
    radar showed a large cloud-free zone behind the storm with the ideal
    conditions for a rainbow. Preparing the camera in peace and quiet, one
    could take their time positioning and waiting for an almost certain
    rainbow to appear overhead. Luckily, the weather radar and predictions
    were correct and the region was treated to a beautiful primary and
    secondary rainbow.

    In order for a double rainbow to be visible, specific atmospheric
    conditions must be present. Primarily, larger water droplets must be
    suspended in the air in order for a double reflection to occur.
    Additionally, the rainbow must be exactly opposite in the sky to the
    solar disk from the viewer’s perspective, also called the antisolar
    point. Adding to the spectacle of a double rainbow is a region of
    Alexander’s Dark Band between the primary and secondary rainbows.
    This comparably darker area is caused by the water droplets between the
    two rainbows scattering light away from your eyes.

    Photo Details: Canon EOS 6D + 2.8/12 mm Fisheye (F4), 1/640s, ISO 200,
    18:12 UT
    * Freital, Saxony, Germany Coordinates: 51.0009, 13.6512

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    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 8 weeks, 6 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 Sat Dec 4 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 - Amboseli National Park, Kenya

    December 04, 2021

    6a0105371bb32c970b017d42e93ca3970c

    Every weekend we present a notable item from our archives.

    This EPOD was originally published May 13, 2013.

    Photographer: Sheyenne Scriven
    Summary Author: Sheyenne Scriven; Jim Foster

    The photo above showing a small herd of elephants in Amboseli
    National Park, Kenya, was taken in late December 2010. Snowcapped
    Mount Kilimanjaro (located across the border of Kenya in Tanzania)
    looms in the background. Kilimanjaro, a dormant stratovolcano
    topping 19,039 ft (5,803 m), is the highest mountain on the African
    continent. Despite the arid conditions pictured above, December is
    usually a rather rainy month in east Africa. However, the long
    rainy season on Kilimanjaro begins in March and lasts early June --
    this is when most of the snowfall is observed.
    African elephants are the largest land animals on Earth. The
    biggest tuskers may stand 13 ft (4 m) tall, weigh as much as 14,000 lbs
    (6,350 kg) and require 300 lbs (136 kg) of food such as bark,
    leaves, fruit and roots each day to sustain them.

    Photo details: Camera Maker: OLYMPUS IMAGING CORP.; Camera Model:
    u7000,S7000; Focal Length: 9.1mm (35mm equivalent: 52mm); Aperture:
    f/4.3; Exposure Time: 0.0020 s (1/500); ISO equiv: 64.
    * Amboseli National Park, Kenya Coordinates: -2.641389, 37.248056

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    More...

    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 3 weeks, 1 day, 16 hours, 25 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)