• ES Picture of the Day 10 2022

    From Black Panther@21:1/186 to All on Mon Jan 10 11:01:06 2022
    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.


    Above Great Salt Lake: Colors, Contrasts, Arcs, and Angles

    January 10, 2022


    PWiggins_epod

    Photographer: Patrick Wiggins
    Summary Author: Patrick Wiggins

    The photo above shows an eye-catching view of the south shore of the
    Great Salt Lake, Utah, as observed through the open window of my
    small Cessna aircraft. At center is Stansbury Island, though
    with the lake now at its lowest level in recorded history, it and
    other islands in the lake are more like peninsulas. The impounded ponds
    in the foreground (at right) are evaporation ponds, where solar
    evaporation is used to concentrate the lake waters to produce salt,
    magnesium, potassium and other minerals. Photo taken on October
    27, 2021.
    * Great Salt Lake, Utah Coordinates: 41.1158, -112.4768

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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 5 weeks, 1 day, 20 hours, 43 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Feb 10 11:01:06 2022
    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.


    Dust Cloud Near Shadow Mountain, Nevada

    February 10, 2022

    20211124_161627

    Photographer: Becca Jones

    Summary Author: Becca Jones

    This sunset photo was taken near the town of Pahrump, Nevada on
    November 24, 2021. The photo shows a dust cloud that was produced
    by a windstorm against the background of the Shadow Mountain.
    Pahrump Valley is located in the Mojave Desert and is roughly
    60 miles (100 km) west of Las Vegas, Nevada. The region borders
    Death Valley, however, is not subjected to the same scorching
    summer temperatures because of its elevation.
    * Pahrump, Nevada Coordinates: 36.2083, -115.9839

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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 9 weeks, 4 days, 20 hours, 43 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sun Apr 10 12:01:14 2022
    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 - Glacial Evidence in Central Park

    April 09, 2022

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    Every weekend we present a notable item from our archives.

    This EPOD was originally published on September 25, 2014.

    Photographer: Bruce Gervais
    Summary Authors: Bruce Gervais; Jackie Phillips

    There's ample evidence of New York City’s glacial history
    throughout Central Park. The top photo shows two glacial
    erratics. These large boulders were transported by moving ice at the
    height of the Wisconsin glaciation, around 20,000 years ago. During
    this time the Laurentide ice sheet covered what is now New York
    City to a depth of about 1,000 ft (300 m). As the ice sheet flowed over
    the landscape it smoothed the bedrock through abrasion and
    plucked fragments of rock from the ground. These plucked fragments were
    incorporated into the base of the moving ice and transported by it.
    After the ice sheet melted, some 12,000 years ago, many fragments were
    scattered throughout the landscape.

    Nycglacialrock2

    The lower photo shows an elongated asymmetrical landform called a
    roche moutonnee. The axis of roches moutonnees indicates the
    direction of ice flow. In this photo, the ice flowed from left to
    right. These landforms are ubiquitous in the park and were cleverly
    incorporated into its design. Photo taken on July 22, 2014.

    Photo details: Top - Camera Maker: Panasonic; Camera Model: DMC-TS3;
    Focal Length: 4.9mm (35mm equivalent: 28mm); Aperture: f/3.3; Exposure
    Time: 0.0063 s (1/160); ISO equiv: 100. Bottom - same except: Focal
    Length: 8 mm; Aperture: f/4.5; Exposure Time: 1/80 s; ISO equiv: 160.
    Photo stitch program: Microsoft ICE.
    * Glacial Erratic, Central Park Coordinates: 40.769358, -73.975933

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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
    * MyShake - University of California, Berkeley
    * 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 5 weeks, 6 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Fri Jun 10 12:00:34 2022
    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 Solar Eclipse of 2021

    June 10, 2022

    IMG_8693

    Photographer: Caitlin Pointer

    Summary Author: Caitlin Pointer

    Shown above is a photo from last year's annular solar eclipse on June
    10, 2021, as viewed at sunrise from the Southern Tier of New York.
    I got up earlier than usual on this morning to have the chance to
    photograph this sunrise solar eclipse. In the Binghamton, New York
    area, we often have cloudy skies, but luckily on this morning the
    clouds behaved just long enough to catch the sunrise. This eclipse
    photo was taken from the upper parking lot at Binghamton University.

    Unlike a total eclipse, an annular eclipse occurs when the Moon’s
    disk does not completely cover the Sun. This incompletely coverage is
    due to the Moon being farther away in its orbit that its size is
    smaller than the Sun’s disk in the sky. As a result, the annular
    event looks like a dark disk on top of a larger, bright disk. On this
    day from this area in New York State, we missed out on the "ring of
    fire", but we were still able to see the sun rise above the horizon
    looking more like a waxing crescent moon.

    Photo details: Canon EOS Rebel T5i, f/32, 1/4000 second exposure,
    ISO-100
    * Binghamton, New York Coordinates: 42.09, -75.97

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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 14 weeks, 4 days, 20 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sun Jul 10 12:01:14 2022
    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.


    Trails of Stars Along the Celestial Equator

    July 08, 2022

    Giannitumino Star Trail_jpg_logo_3000pix

    Photographer: Gianni Tumino

    Summary Authors: Gianni Tumino; Jim Foster

    The photo above shows the trails of stars along the celestial
    equator as observed from Punta Cirica (Sicily) Italy, on March 2, 2022.
    Each curvilinear streak is the path of a star. Notice that the stars on
    either side of the celestial equator, which runs from top left to
    bottom right, have trails that begin to curve (due to the Earth's
    rotation) in the direction of their respective celestial poles, the
    north pole at right, and the south pole at left.

    Photo details: Canon EOS camera; 14 mm lens; f/1.8; f/3.2; N°160; 12
    second exposure; ISO 3200. Software: Sequator; Lightroom; Photoshop.
    * Punta Cirica (Sicily) Italy Coordinates: 36.692692, 14.969296

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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 18 weeks, 6 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Wed Aug 10 12:00:38 2022
    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.


    Lightning Scar on Tulip Tree

    August 10, 2022

    Trevor_4EC25E3E-479C-45D1-8E07-C0EC21072013 (002)_a

    Photographer: Trevor Schlindwein
    Summary Author: Trevor Schlindwein

    The photo above was taken after our tulip tree ( Liriodendron
    tulipifera) in Chatham, Illinois, was struck by a bolt of lightning
    on May 26, 2022. This tree stands approximately 3 stories tall (about
    42-ft or 13 m). The lightning left cracks on several large upper
    branches (not pictured) as it traveled toward the ground. It struck
    with such force that pieces of the bark were blown out of the side of
    the tree (pictured here), where they landed on a rooftop and driveway
    across the street. This strike also left a 12-inch by 12-inch (30
    cm x 30 cm) hole in the ground as the lightning continued its path
    towards the roots of the tree.

    It should be noted that there were several taller pin oaks within
    100 ft (30 m) of this tree that were not struck. An arborist cut down
    our tree down for safety reasons because it literally split the trunk
    in half. Tulip trees tend to be targeted by lightning more than some
    other trees of similar stature. Fortunately, no one was injured. Photo
    taken on May 26,2022.


    Chatham, Illinois Coordinates: 39.6762, -89.7045

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    Plant Links

    * Discover Life
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    * USDA Plants Database
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    * Plants in Motion
    * What Tree is It?

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

    https://epod.usra.edu

    --- up 23 weeks, 2 days, 20 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sat Sep 10 12:01:08 2022
    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.


    Twilight Comparison at Curitiba, Brazil, Before and Post Eruption of
    Hunga Tonga

    September 09, 2022

    Ep2016-07-07 e 2022-06-12 - Sol a -11 graus

    Photographer: Fabiano Belisário Diniz
    Summary Author: Fabiano Belisário Diniz

    Shown above is a dramatic comparison between a normal twilight and a
    volcanic twilight as observed from Curitiba, Brazil, on July 7,
    2017 (top) and on June 12, 2022 (bottom). Ash from the Hunga
    Tonga volcano played a major role in enhancing the dusk colors on
    the 2022 photo. Note that both photos were taken when the sun was 11
    degrees below the horizon in Curitiba. Many places in the southern
    hemisphere, and elsewhere, have been experiencing particularly
    colorful twilights since late January, some two weeks after the
    eruption.

    Photo details: Although both photos show the same stage of twilight
    (sun at -11 degrees), the city lights appear fainter in the bottom
    photo because I used a graduated filter with the dark portion facing
    down.


    Curitiba, Brazil Coordinates: -25.4372, -49.2700

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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 27 weeks, 5 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Mon Oct 10 12:01:14 2022
    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.


    Loana Valley of Italy at Night

    October 10, 2022

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    Photographer: Paolo Bardelli

    Summary Author: Paolo Bardelli
    These photos show two different views of night sky conditions observed
    from Val Loana (Loana Valley), in the Piedmontese Alps of northern
    Italy. Peaks at left delimit the boundary of the Val Grande
    National Park.

    The Loana valley is also almost uninhabited, thus this is a very dark
    area at night. Despite the presence of the quarter Moon (half
    illuminated) and artificial lighting in the direction of the Po
    Valley to the south, the Milky Way is clearly visible (top view).

    However, the bottom view (looking north) shows that light pollution
    here is still a concern even though existing laws are in place aimed to
    curb this stray light. Note the asterism of the Big Dipper, through
    a layer of cirrus clouds, at lower left. Photos taken on the night of
    July 10, 2022.

    Photo details: Canon 6D camera; Samyang lens 14 mm; 30 seconds
    exposure; f/2.8; 6400 ISO; Photoshop processing. Akira Fuji effect
    used to highlight constellations.

    Loana Valley, Italy Coordinates: 46.0890, 8.4772

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    Night Sky Links

    * Space Weather Live
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    * About the Moon
    * American Meteor Society
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    * Global City Lights
    * Heavens Above Home Page
    * The International Meteor Organization
    * Lunar and Planetary Institute
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    * Understanding The Moon Phases

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

    https://epod.usra.edu

    --- up 32 weeks, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Nov 10 11:00:56 2022
    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.


    A Year of Sunspots

    November 10, 2022


    A Year in the Sun (1)

    Photographer: Soumyadeep Mukherjee
    Summary Author: Soumyadeep Mukherjee

    I imaged the Sun for 365 days between December 25, 2020, and
    December 31, 2021, missing just six days during this period. The
    project started with the aim of recording the journey of a single
    sunspot across the solar disk, but I managed to continue imaging
    for an entire year. From my home in Kolkata, India, I blended the
    images to create a single shot, which records the rise of Solar
    Cycle 25. A total of 127 active regions appeared on the Earth-facing
    solar disk (AR 12794–AR 12921) during this phase – the image above
    shows all of them.

    Two bands of sunspots can be identified moving across the solar
    disk, around 15–35 degrees north and south of the equator. Note that
    they gradually start drifting towards the solar equator – a phenomenon
    known as Spörer’s Law.
    Photo details: Nikon D5600 camera; Sigma 150–600c lens; Thousand Oaks
    Filter (White-Light); f/6.3; ISO 100; 365 individual exposures
    (1/80-second to 1/500-second), 600mm; Post-processing using PIPP and
    Photoshop.
    Kolkata, India Coordinates: 22.5726, 88.3639


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    Sun Links

    * NASA Solar Dynamics Observatory
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    * 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 36 weeks, 3 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sat Dec 10 11:01:16 2022
    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.


    Crystal Forms in Petrified Wood

    December 09, 2022

    TomMc_EPODImage2.WolverineLoopPetrifiedForest2022#2 (003)

    TomMc_EPODImage1.PetrifiedWoodWolverineClose2022#1 (003)

    Photographer: Thomas McGuire

    Summary Author: Thomas McGuire


    Grand Staircase National Monument is a spectacularly rich geologic
    area in remote southern Utah. Within this monument, Wolverine
    Petrified Forest, shown above at top, features silicified (petrified)
    tree trunks and sections. The variety of colors is caused by iron
    oxide and other oxide minerals.


    In the bottom photo, the geometric forms at right are dark stained
    quartz crystals that probably grew by groundwater deposition in
    openings called “ vugs.” Quartz is extremely common, but visible
    quartz crystals less so. When an igneous rock cools and
    crystallizes, quartz is the last common mineral to harden, so it
    usually fills in the irregular openings between previously formed
    minerals including feldspar, mica, amphibole and pyroxene. What
    surprised me was the texture on this exposed surface. The radial forms
    at the bottom of the photo are new to me, and I have yet to understand
    how they formed. Photos taken in July 2022.



    Grand Staircase National Monument, Utah Coordinates: 37.799633,
    -111.214906


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    Geology Links

    * Earthquakes
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    * Geomagnetism
    * General Dictionary of Geology
    * Mineral and Locality Database
    * Mohs Scale of Mineral Hardness
    * This Dynamic Earth
    * USGS
    * MyShake - University of California, Berkeley
    * 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 40 weeks, 5 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)