• ES Picture of the Day 23 2021

    From Black Panther@21:1/186 to All on Sat Jan 23 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.


    Archive - Afternoon Analemma for Athens

    January 23, 2021

    Analemma1600

    Every weekend we present a notable item from our archives. This EPOD
    was originally published January 23, 2004.

    Provided by: Anthony Ayiomamitis
    Summary authors & editors: Anthony Ayiomamitis; Jim Foster

    The image above is a set of 44 multi-exposures on the same frame of
    film taken from January through December of 2003, in Athens, Greece at
    precisely 16:00:00 Local Meridian Time (the foreground was added
    later). This analemma represents the motion of the Sun during the
    course of one year as observed in the late afternoon. As a result of
    the Earth's tilt about its axis (23.5 degrees) and its elliptical orbit
    about the Sun, the position of the Sun in the sky changes from one day
    to the next, even when observed at the same time on each day of the
    year. Furthermore, the figure 8 loop the Sun makes in the sky over a
    12-month period (analemma) will be inclined at different angles
    depending on one's geographical latitude. The latitude of Athens is
    approximately 38 degrees. Imaging the Sun over a given location for an
    entire year is a demanding photographic accomplishment indeed -- few
    such attempts have been successful.


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    Sun Links

    * NASA Solar Dynamics Observatory
    * NASA Solar Eclipse Page
    * NOAA Solar Calculator
    * The Sun-Earth Connection: Heliophysics
    * The Sunspot Cycle
    * Solar System Exploration: The Sun
    * The Sun Now
    * This Week’s Sky

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

    https://epod.usra.edu

    --- up 5 weeks, 3 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 Tue Feb 23 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.


    Sun Setting Behind Mount Etna

    February 23, 2021

    Marcella_SunandEtna

    Photographer: Marcella Pace
    Summary Author: Marcella Pace

    The photos above show the Sun setting behind the Mount Etna
    (10,892 ft or 3,320 m) summit crater complex in Sicily, Italy. It’s a
    composition of two shots from the same location without changing the
    frame; one of the Sun using a solar filter, one with no filter for when
    the Sun had moved out of frame. I calculated the ideal position to get
    the most dramatic shot. Note that although no sunspots are visible
    here, the solar disk was partially obscured by smoke from the
    volcano's multiple summit craters. When these photos were snapped, and
    during the days before, there was activity from the Voragine Crater
    as well as blasts and discontinuous emissions of ash from the Northeast
    Crater and the New Southeast Crater. Photos taken on February 18, 2020.
    Click here to see a video showing how refraction deforms the edge
    of the solar disk.

    Photo Details: Canon SX 60Hs camera. With Sun - 247 mm; 1/6 second
    exposure; f/8; ISO 100 and astrosolar filter. No filter – 247 mm; f/8;
    ISO 100. The video was shot with a Nikon Coolpix P1000 camera; equipped
    with an astrosolar filter; Nikon D7100 lens; sequence of 720 photos at
    one-second intervals; f/20; 1/350-second exposure; ISO 100.
    * Mount Etna, Italy Coordinates: 37.75034, 14.99416

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    Sun Links

    * NASA Solar Dynamics Observatory
    * NASA Solar Eclipse Page
    * NOAA Solar Calculator
    * The Sun-Earth Connection: Heliophysics
    * The Sunspot Cycle
    * Solar System Exploration: The Sun
    * The Sun Now
    * This Week’s Sky

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

    https://epod.usra.edu

    --- up 9 weeks, 6 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 Tue Mar 23 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.


    Lofoten Islands, Norway

    March 23, 2021

    Alvaro Loften Islands

    Photographer: Alvaro Perez
    Summary Authors: Alvaro Perez; Stu Witmer

    The Lofoten Islands, seen above, lie off the coast of Norway above
    the Arctic Circle. A climate provided by the passing Gulf
    Stream gives these islands warmer temperatures than other places at the
    same latitude such as Alaska or Greenland.

    Lofoten is known for its distinctive scenery. Its mountains are part of
    the Scandinavian Caledonides range that runs south from the
    northern tip of Norway. The geology of the islands is complex
    containing primarily granitic basement rocks of the
    Transscandinanavian igneous belt.

    First inhabited over 7,000 years ago the islands were covered with
    large birch and pine forests, home to such wildlife as bears, deer and
    beavers. Grain was grown here as early as 4,000 years ago. Photo taken
    February 19, 2018.
    * Hamnøy, Norway Coordinates: 67.94759, 13.13138

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    Geography Links

    * Atlapedia Online
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    * Holt Rinehart Winston World Atlas
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    * 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 13 weeks, 6 days, 20 hours, 27 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Fri Apr 23 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.


    Guatemalan Volcanoes

    April 23, 2021

    _DSC5148 (FILEminimizer)

    Cindy_Guatemala volcanoes

    Photographers: David Rojas; Cindy Mariela Lorenzo
    Summary Author: David Rojas

    The photo at top showing a spectacular sunrise was captured from
    the Acatenango volcano (foreground) in Guatemala, at an elevation
    of 11,500 ft (3,505 m). It was taken on January 24, 2021. Note that the
    luminous area at right center is a lava flow on the flank of the
    Pacaya volcano (8,373 ft or 2,552 m). Volcanic activity in this
    region has increased in the past several months. The bottom photo shows
    a twilight view of a number of Guatemalan volcano summits as
    observed on December 9, 2019.
    * Pacaya Volcano, Guatemala Coordinates: 14.3823, -90.6015

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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 1 week, 2 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 Wed Jun 23 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.


    Triangular Shadow Cast on the Strait of Messina

    June 23, 2021

    IMG_1508-Pano-2-Modifica-Modifica-2

    Photographer: Fabio Di Stefano

    Summary Author: Fabio Di Stefano & Cadan Cummings

    This astonishing view from atop Mount Dinnammare overlooks the city
    of Messina, Italy, located on the eastern edge of the island of
    Sicily. Separating mainland Italy and Sicily, the 3.2 mi (5.1 km)
    wide Strait of Messina seen at the base of the mountain connects
    the Tyrrhenian Sea and Ionian Sea. This photograph taken at
    sunset on August 7, 2018, adds extra dimension to the picturesque
    landscape from Mount Dinnammare casting what appears to be a triangular
    shadow over the strait. This shadow is due to Sun angle on the
    horizon and perspective exaggerating the shape cast from the rugged
    landscape on the comparably flat landscape below. Note that shadows
    such as this are only observed when the Sun is low in the sky and an
    abundance of dust is present in the atmosphere. The airborne dust
    outside of the shadow acts to scatter sunlight, but inside of the
    shadow scattered sunlight is absent. Even mountains that have flat tops
    when projected in this manner appear to have triangular shadows.

    Photo Details: Overview of two shots taken with a Canon EOS M6 and a
    Tokina 11-6mm f / 2.8 IF DX lens. ISO 200, f / 8, 1/80 " exposure, 11mm
    focal length.
    * Mount Dinnammare, Messina, Italy: 38.160249, 15.464369

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    * Solar System Exploration: The Sun
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    * This Week’s Sky

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

    https://epod.usra.edu

    --- up 6 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 Fri Jul 23 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.


    Arcus Cloud over the Villa Gesell Province of Buenos Aires

    July 23, 2021

    _D2_4106 Panorama

    Photographer: Christian Grosso

    Summary Authors: Christian Grosso; Jim Foster

    Featured above is a panoramic view of a severe storm that slammed
    into the Villa Gesell Province of Buenos Aires, Argentina, on February
    14, 2021. The rounded cloud formation is known as an arcus cloud.
    In this case, since it appears to be affixed to the base of the parent
    thunderstorm, it’s called a shelf cloud. A roll cloud is
    detached from its parent storm. These clouds take shape along the
    leading edge of approaching thunderstorm cells as cool air from strong
    downdrafts is pushed into the warmer and moister air that’s feeding
    the storm.

    Photos details: panorama of 9 photos; Canon EOS 7D Mark II camera; 1/40
    sec. exposure; f / 4; ISO 160; 17 mm focal length; Canon EF17-40mm f /
    4L USM lens; 19:30 local time.
    * Villa Gesell, Buenos Aires, Argentina Coordinates: -37.29969,
    -57.00049

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    Severe Weather Links

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    * US National Weather Service

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

    https://epod.usra.edu

    --- up 11 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 Mon Aug 23 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.


    Midnight Drama

    August 23, 2021


    PSX_20210610_091127 (1)

    Photographer: Soumyadeep Mukherjee

    Summary Authors: Soumyadeep Mukherjee

    The state of West Bengal, along with other parts of India, has seen
    a surge in the number of lightning strikes in 2021. Actually, the
    number of strikes has been increasing over the past several years.
    Meteorologists aren’t sure of the cause, however, one theory points to
    increased air pollution, at least in areas where wildfires are
    prevalent.

    On June 8 of this year, the state of West Bengal alone recorded the
    death of 26 people due to cloud-to-ground lightning strikes. Photo
    taken on June 9, 2021, in Kolkata, India.
    Photo details: This image is a stack of 13 separate images; Nikon D5600
    camera; 18-55 mm lens; f/6.3; 30 seconds exposure; ISO 100; 20 mm.
    Adobe Camera Raw, Photoshop.
    * 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 15 weeks, 3 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 Sep 23 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.


    Dazzling Atmospheric Phenomena on Painted Pavement

    September 23, 2021

    IMG_4525-upr-ww(1)

    Photographer: Miroslav Grnja

    Summary Author: Miroslav Grnja; Cadan Cummings

    The picture above is an example of an optical phenomena called the
    opposition effect. The opposition effect occurs when a rough
    surface is illuminated from directly behind and causes an area of
    apparent brightness around the object’s shadow. Specifically, the area
    of brightness is centered around the anti-solar point, which is the
    point directly opposite of the Sun. Similar to the opposition effect,
    glory is another form of optical phenomenon that appears at an
    object’s anti-solar point. Instead of depending on light scattering
    from a surface, a glory happens due to moisture or water droplets in
    the air that reflect and refract sunlight to create a circular
    shaped rainbow.

    In the case of the picture above, the crosswalk was repainted several
    days prior. This newly painted surface with high reflecting and
    scattering properties presumably accentuated the rough texture of the
    pavement and combined with moisture in the air led to these optical
    phenomena being visible around the shadow.
    * Bratislava, Slovakia Coordinates: 48.1486, 17.1077

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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, 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 Oct 23 11:00:24 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 - Flosagjá Canyon, Thingvellir National Park, Iceland

    October 23, 2021

    Thingvillir11147565_966356593416953_3226334592977477733_n

    August 2015 Viewer's Choice Every weekend we present a notable item
    from our archives.

    This EPOD was originally published August 27, 2015.

    Photographer: Tero Marin
    Summary Author: Tero Marin; Jim Foster
    The photo above shows Flosagjá Canyon in Thingvellir National
    Park, Iceland, It's in this rift valley, on the Mid-Atlantic
    Ridge, where the European tectonic plate and the North American
    tectonic plate meet. Both plates are drifting away from each other --
    spreading apart about 1 in (2.5 cm) per year. Thingvellir was chosen in
    the tenth century as a centrally located meeting place for a general
    assembly of the people of Iceland. Photo taken on May 26, 2015.
    Photo Details: Nikon D7100 camera; AF-S Nikkor 12-24 mm, f/4G; 12 mm;
    ISO 400; f/9; 1/320 sec. exposure.
    * Thingvellir National Park, Iceland Coordinates: 64.258056, -21.125

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    Geology Links

    * Earthquakes
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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 7 weeks, 1 day, 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 Dec 23 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.


    Multiple Lunar Halos and Stary Night Sky

    December 23, 2021

    PSX_20210928_192205(2)

    Photographer: Soumyadeep Mukherjee

    Summary Authors: Soumyadeep Mukherjee; Cadan Cummings

    This feature photo captures several atmospheric optical phenomena
    and night sky objects in the sky over Kolkata, India. Most
    prominently, two types of lunar halos are visible, a 9 degree
    odd-radius and 22-degree halo. Both lunar halos are a product of
    light refraction and reflection from ice crystals in the
    atmosphere. As their names imply, lunar halos are described by their
    apparent radii around the Moon. In addition to the lunar halos,
    several additional objects seen in the night sky included the
    Pleiades approaching a near-conjunction with Moon, rise of the
    "hunter" Orion constellation, and an airplane contrail that
    appears to cross the lunar halos. Overall, this photo shows a busy
    night sky with a lot going on all at once!

    Photo details: Nikon D5600, Tokina 11-16mm atx-i, Digitek DTR 520BH
    Tripod; Exif: 30 × 13 seconds, f/3.2, ISO 160, 11mm (Sky), 6 × 6
    seconds, f/4, ISO 800, 11mm (Foreground)
    * Kolkata, India Coordinates: 22.5726, 88.3639

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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 2 weeks, 4 days, 20 hours, 43 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)