 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

     *  Atmospheric Optics
     *  Color and Light in Nature
     *  The Colors of Twillight and Sunset
     *  Refraction Index
     *  Image Gallery: Atmospheric Effects
     *  What is a Rainbow?

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

https://epod.usra.edu
 
