• ES Picture of the Day 16 2021

    From Black Panther@21:1/186 to All on Sat Jan 16 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.


    Archive - Aurora Observed from Space Station

    January 16, 2021

    Iss006-e-47517_540

    Every weekend we present a notable item from our archives. This EPOD
    was originally published January 16, 2004.

    Provided by: NASA Earth Observatory
    Summary authors & editors: Earth Observatory; Jim Foster

    According to Expedition 6 Science Officer Don Pettit, aboard the
    International Space Station (ISS), being in orbit around the Earth
    offers a unique perspective on auroras. He mentioned that when their
    orbit coincided with local midnight at high latitudes, the lights were
    turned down so that it was possible to peer out the windows at the
    breathtaking views of the shimmering northern lights. The above photo
    was taken from the ISS as it orbited over the Southern Hemisphere,
    approximately 400 km above the Earth’s surface, on April 20, 2003.

    Most of the auroral light is emitted by oxygen atoms excited from
    bombardment by charged solar particles. Charged particles consisting of
    atomic fragments released by the Sun stream through space and run into
    Earth’s magnetic field. When a charged particle encounters our magnetic
    field, a force perpendicular to the motion is created, which diverts
    the particle into a spiral path until it collides with atoms in the
    upper atmosphere. The collisions excite the atoms (oxygen and nitrogen)
    into emitting light, in much the same way that electrons pumped inside
    of a glass tube filled with neon gas create a neon light. Green light
    is the color most commonly observed. It's emitted from excited oxygen,
    centered around a wavelength in the electromagnetic spectrum of 558
    nanometers. Red light, emitted about wavelengths in the 630 nanometer
    region, is less infrequently observed. Green emissions extend from
    about 100 km altitude to approximately 300 km, whereas the red
    emissions lie on top of the green and extend to perhaps 500 km.


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    Atmospheric Effects Links

    * Atmospheric Optics
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    * 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 4 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 16 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.


    Green Flash Sequence Observed from Civitavecchia, Italy

    February 16, 2021

    MarcoM_green_flash

    Photographer: Marco Meniero
    Summary Author: Marco Meniero

    Shown above is a green flash sequence that I observed at sunset on
    November 22, 2020. I took 280 shots of the solar disk during the last 5
    minutes before it cleared the horizon at Civitavecchia (Rome) Italy.
    The camera is facing out over the Tyrrhenian Sea. I used the six best
    images of the green flash for this composition.

    A flash of green light can sometimes be detected on the Sun’s upper
    rim as the solar disk approaches the horizon (rising or setting). The
    emerald color is due to atmospheric dispersion. In essence,
    different colors of visible light are bent different amounts, with
    the shorter wavelengths, including blues and greens, refracting
    more strongly than the longer wavelengths. Note that the black band
    resembling Pacman's mouth is in actuality a cloud positioned just above
    the horizon.

    Photo Details: Canon EOS 1DXMk2 camera; set in annual mode with 14fps
    and 50Iso burst; Canon EF400 lens; f / 2.8; image amplifier (AMPLI by
    COMA) that pulled the focal length up to 4500 mm
    * Civitavecchia, Italy Coordinates: 42.08949, 11.79088

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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

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    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Tue Mar 16 12:00:50 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.


    Mesa Arch in Canyonlands National Park, Utah

    March 16, 2021


    1canyonland

    Photographer: Christina Griessl
    Summary Authors: Christina Griessl; Patrick Wiggins

    Seen above is sunrise under Mesa Arch in Canyonlands National
    Park, Utah. In the near distance are formations called Washer
    Woman on the left and Monster Tower on the right and Airport
    Tower further back. Photo taken January 15, 2018.
    * Canyonlands National Park, Utah Coordinates: 38.26642,
    -109.87999

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    Geography Links

    * Atlapedia Online
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    * 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

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  • From Black Panther@21:1/186 to All on Fri Apr 16 11:01:10 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.


    Wave Clouds over Northwestern Washington State

    April 16, 2021

    Wave Clouds and Deer_DxO

    Photographer: Joe LaCour
    Summary Author: Joe LaCour

    Looking Southeast from Dungeness, Washington, the setting Sun
    illuminated these very interesting and complex appearing wave
    clouds that formed as westerly winds blew over the Olympic Range
    (off the right side of this photo). Between about 5,000 and 10,000 ft
    (1,524 - 3,048 m), winds were measured at 40 to 60 knots. Wave
    clouds such as these are often observed on the lee side of the
    Olympics. Note the friendly visitor in the foreground, feasting on some
    of our shrubs. Photo taken on February 21, 2021.

    Photo Details: Leica M9 camera; 35 mm Summicron lens; f5.6; processed
    with DxO.
    * Dungeness, Washington Coordinates: 48.1468, -123.1232

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    * Atmospheric Optics
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    * 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 2 days, 22 hours, 42 minutes
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  • From Black Panther@21:1/186 to All on Wed Jun 16 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.


    Mineral Moon and ISS Transit

    June 16, 2021


    Composite_1_1

    Merek_ISS_189654317_3121762714776786_8896917478792884007_n

    Photographers: Alexandru Barbovschi; Marek Stromayer
    Summary Author: Alexandru Barbovschi

    Shown above in the top photo is the International Space Station
    (ISS) transiting the full mineral Moon as observed from the
    Republic of Moldovia on March 26, 2021. This crossing occurred
    precisely at at 22:19:00 local time – a duration just 0.7 seconds.

    Each of the colors on the Moon’s surface represents a class of
    minerals. For instance, blue areas are rich in titanium, while
    orange areas are titanium poor. A common lunar mineral, ilmenite,
    is rich in titanium oxides. Regions abundant in titanium are of
    interest because lunar titanium is bound to oxygen. Of course,
    oxygen is critical for not only providing future astronauts a source of
    air to breath but for use as an oxidizer for rocket engines. Photo
    taken on March 26, 2021. Note that the bottom photo shows a close up
    view of another transit occurring earlier in the year.

    Photo details: Sky-Watcher Star Adventurer mount (it has a lunar
    tracking mode available); Sky-Watcher Evostar 72ED (72/420mm); filter
    wheel with Baader LRGB filters set (for the transit UV/IR filter was
    used); Barlow 2x lens; ZWO ASI174MM camera. The ISS image was cropped
    out and was stacked separately to improve clarity and sharpness.
    * Republic of Moldova Coordinates: 47.00, 29.00

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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 Fri Jul 16 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.


    Lenticular Cloud over Turin, Italy

    July 16, 2021


    Piero_IMG_4734

    Photographer: Piero Armando
    Summary Authors: Piero Armando; Jim Foster

    These peculiar looking clouds (at top) appeared over Turin, Italy,
    during the evening of May 7, 2021. Known as lenticular clouds
    (altocumulus lenticularis), they tend to occur along the lee slopes
    of mountain ranges when stable air is lifted and begins to
    undulate. If moisture is available aloft, lens-shaped or
    saucer-shaped clouds will form in the flattened crests of the waves.
    It’s here that the air current is coolest, thus promoting condensation.

    Photo details: Canon EOS 600D camera; 1/320 second exposure; F/7.1; 70
    mm focal length; ISO 100.
    * Turin, Italy Coordinates: 45.0703, 7.6869

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    * Atmospheric Optics
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    * 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 10 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 16 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.


    Comet NEOWISE Seen from Quebec City

    August 16, 2021

    C2020F3_NEOWISE_14juil20 - Copie - Copie - Copie - Copie - Copie

    Photographer: Philippe Moussette
    Summary Authors: Philippe Moussette; Jim Foster

    Shown above is a gorgeous view of Comet NEOWISE as observed last
    summer above Quebec City, Quebec, Canada. Chateau Frontenac
    dominates the foreground. Because NEOWISE has a long elliptical
    orbit, a view such as this won’t occur for another 6,800 years.
    Unfortunately, no bright comets are predicted to grace the sky in
    2021. Photo taken on July 14, 2020.

    Photo details: 1DX Mark III Cannon camera; 300 mm lens; f2.8; 2 seconds
    exposure time; 1600 ISO, on a fixed tripod.
    * Quebec City, Quebec, Canada Coordinates: 46.8139, -71.2080

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    * 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 14 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 16 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.


    22-Degree Halo Observed from Norfolk, Virginia

    September 16, 2021

    RobBruner_A61041B4-D730-44C3-8211-9072F4E559F7

    Photographer: Rob Bruner
    Summary Author: Rob Bruner; Jim Foster
    Stepping outside from lunch one day earlier this year, I couldn’t help
    but notice this 22-degre solar halo. Circular halos about the
    Sun (and Moon) are caused by randomly oriented ice crystals in the
    atmosphere that act like mirrors and prisms to reflect and refract
    light away from the Sun. The 22-degree halo, and in fact all halos, are
    polarized. Note the contrails at left center, running through
    and tangent to this halo. When looking in the vicinity of the Sun,
    always makes sure to protect your eyes. Photo taken near Norfolk,
    Virginia on May 2, 2021.
    * Norfolk Virginia Coordinates: 36.8508, -76.2859

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    * What is a Rainbow?

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

    https://epod.usra.edu

    --- up 1 week, 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 16 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.


    Archive - Pamukkale, Turkey

    October 16, 2021

    6a0105371bb32c970b019aff0ca352970d

    Every weekend we present a notable item from our archives.

    This EPOD was originally published September 16, 2013.

    Photographer: Andre Vicente Goncalves
    Summary Author: Andre Vicente Goncalves
    Shown above is the wondrous area of Pamukkale in southwestern
    Turkey, near the city of Denizli. The natural terraces in the
    foreground, composed primarily of calcite and aragonite, were
    formed by water flowing from hot springs having particularly high
    calcium carbonate ( travertine) content. Note the rain-shaft in
    the distance at left, while the Sun is still shining on the right-hand
    side of the photo. Crepuscular rays further enhance the lure of
    this scene. I was indeed fortunate to witness such a beautiful
    spectacle. Pamukkale was declared a World Heritage Site in 1988.
    Photo taken on August 17, 2013.

    Photo details: Camera Model: Canon EOS 5D Mark II; Lens: EF16-35mm
    f/2.8L II USM; Focal Length: 17mm; Focus Distance: Infinite; Aperture:
    f/8.0; Exposure Time: 0.0040 s (1/250); ISO equiv: 500; Software: Adobe
    Photoshop CC (Macintosh).
    * Denizli, Turkey Coordinates: 37.9205, 29.121

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

    https://epod.usra.edu

    --- up 6 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 Tue Nov 16 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.


    Rock Glacier in Colorado Rockies

    November 16, 2021


    Stan_rockglacier

    Photographer: Stan Wagon

    Summary Authors: Andrew Fountain: Stan Wagon

    Rock glaciers are accumulations of ice and rock with rock exposed
    on the surface and ice hidden within the interior. Unlike talus
    slopes, rock glaciers flow. There are more than 650 rock glaciers in
    the Colorado mountains and this photograph shows a rock glacier near
    Colorado's Mt. Elbert (14,430 feet or 4,398 m), the highest peak in
    the Rocky Mountains. This feature is on the northeast side of the
    southeast ridge of Bull Hill (13,761 feet or 4,194), just south of
    Elbert. One can deduce the existence of ice under the rocks from the
    steepness of the rock face at the snout, the general inflated shape,
    and the evidence of down-valley flow. The example shown does not extend
    much down-valley so it may not be moving. Thus we would think of it as
    a "feature of interest", meaning that it has characteristics suggesting
    the presence of ice and might be a rock glacier. Photo taken on
    September 22, 2021.
    Photo details: SONY A6500 camera; ISO 250; f/14; 1/250 second exposure;
    53 mm.
    * Bull Hill Mountain (southeast ridge), Colorado Coordinates:
    39.09472, -106.4547

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    * 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 days, 16 hours, 24 minutes
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  • From Black Panther@21:1/186 to All on Thu Dec 16 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.


    Mountain Shadow Projected onto Clouds

    December 16, 2021

    IMG_3577

    Photographer: Elena Paschetto

    Summary Authors: Elena Paschetto; Cadan Cummings

    The photo above features a shadow of Monviso projected on the
    clouds around sunset. Monoviso is located in the Alps on the
    Italian-French border and is widely-known for its characteristic
    pyramid shape. At 12,600 ft (3,841 m) tall, the mountain is the tallest
    in the Cottian Alps. Due to Sun angle and the perspective of the
    viewer, mountain shadows appear triangular regardless of the actual
    shape of the mountaintop.
    * Paesana, Province of Cuneo, Italy Coordinates: 44.683, 7.283

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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 1 week, 4 days, 20 hours, 43 minutes
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