Subj : ES Picture of the Day 18  2022
To   : All
From : Dan Richter
Date : Thu Aug 18 2022 12:00:34

 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.


 Pollen and Flying Seeds

   August 18, 2022


    #01 (7)

   Photographer:  Paolo Bardelli
   Summary Author:  Paolo Bardelli

   Even if we don't realize it, during springtime the sky is crossed by
   large quantities of flying seeds and  pollen. The photo at top is a
   sum of 30 shots showing the presence of many such seeds as observed
   from Albusciago, Italy, on April 14, 2020. In addition, the
   proliferation of pollen grains, though practically invisible, can
   produce the spectacle seen on the bottom photo – a  corona about the
   Sun.

   Mid-April was quite clear in Albusciago, due to  foehn winds
   (strong, warm and dry winds), while at the same time birch trees were
   blooming. The very low relative humidity (measured at 12% at my weather
   station) caused the release of large quantities of pollen into the air.
   It was thus possible to detect a "pollen corona," created by the
    diffraction of sunlight by the minute, elliptically shaped pollen
   grains.

   Though springtime can be difficult for people like me who  suffer
   with allergies, being able to observe this pollen corona offered some
   consolation. Note,  always use extreme caution when looking anywhere
   near the Sun. Here, I used the top of a chimney to block the Sun and
   made sure not to look through the viewfinder.

   Photo details: Canon 70D, zoom lens 17/85 mm. with polarizing filter.
   Processing: PS CC, Startrails.


   Albusciago, Italy Coordinates: 45.7395, 8.7939


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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?

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   Space Research Association.

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