                APOD: 2018 June 13 - Red Cloudbow over Delaware

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                 2018 June 13
                                      [2]
                          Red Cloudbow over Delaware
    Image Credit & Copyright: Michael C. Neff [3] (Neffworks Artography [4]

Explanation: What kind of rainbow is this? In this case, no rain was involved
-- what is pictured is actually a red cloudbow [5] . The unusual sky arc was
spotted last month during sunset in Rehoboth Beach [6] , Delaware [7] , USA
[8] . When the photographer realized that what he was seeing was
extraordinary, he captured it with the only camera available -- a cell phone.
Clouds are made of [9]  water droplets, and in a cloudbow a cloud-droplet
group [10]  reflects back light from the bright Sun (or Moon) on the opposite
side of the sky. Similar phenomena include fogbows [11]  and airplane glories
[12] . Here, the red color [13]  was caused by atmospheric air preferentially
scattering away blue light -- which simultaneously makes most of the sky
appear blue [14] . A careful inspection reveals a supernumery bow [15]  just
inside the outermost arc, a bow caused by quantum [16] diffraction [17] .

Open Science: Browse 1,700+ codes in the Astrophysics Source Code Library [18]

                    Tomorrow's picture: Yosemite Six [19]

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Site notes:
  [1] archivepix.html
  [2] image/1806/CloudBowRed_Neff_1440.jpg
  [3] https://www.neffworks.com/Bio
  [4] https://www.neffworks.com/
  [5] https://www.atoptics.co.uk/fz285.htm
  [6] https://www.youtube.com/watch?v=vxUc8IkT8OQ
  [7] https://en.wikipedia.org/wiki/Delaware
  [8] https://en.wikipedia.org/wiki/United_States
  [9]
https://pmm.nasa.gov/education/content/
what-are-clouds-made-are-they-more-likely-form-polluted-air-or-pristine-air
  [10] https://www.atoptics.co.uk/droplets/fogdrpsz.htm
  [11] ap100504.html
  [12] ap161222.html
  [13]
https://news.nationalgeographic.com/news/2013/10/
131027-sunset-sky-change-color-red-clouds-science/
  [14] https://spaceplace.nasa.gov/blue-sky/en/
  [15] https://www.atoptics.co.uk/rainbows/supform.htm
  [16]
https://www.olympus-lifescience.com/en/microscope-resource/primer/
lightandcolor/diffraction/
  [17] https://www.atoptics.co.uk/droplets/corform.htm
  [18] http://ascl.net/code/all
  [19] ap180614.html
  [20] ap180612.html
  [21] archivepix.html
  [22] lib/apsubmit2015.html
  [23] lib/aptree.html
  [24] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [25] calendar/allyears.html
  [26] /apod.rss
  [27] lib/edlinks.html
  [28] lib/about_apod.html
  [29] http://asterisk.apod.com/discuss_apod.php?date=180613
  [30] ap180614.html
  [31] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [32] http://www.phy.mtu.edu/
  [33] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [34] http://www.astro.umd.edu/
  [35] lib/about_apod.html#srapply
  [36] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [37] https://astrophysics.gsfc.nasa.gov/
  [38] https://www.nasa.gov/
  [39] https://www.nasa.gov/centers/goddard/
  [40] http://www.mtu.edu/
