Astronomy Picture of the Day

                         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 November 18
                                      [2]
                         Creature Aurora Over Norway
  Image Credit & Copyright: Ole C. Salomonsen [3] (Arctic Light Photo [4] )

Explanation: It was Halloween and the sky looked like a creature. Exactly
which creature, the astrophotographer was unsure [5]  but ( possibly you can
suggest one [6] ). Exactly what caused this eerie apparition [7]  in 2013 was
sure: one of the best auroral displays [8]  in recent years. This spectacular
aurora [9]  had an unusually high degree of detail [10] . Pictured here [11] ,
the vivid green and purple auroral colors [12]  are caused by high atmospheric
oxygen [13]  and nitrogen [14] reacting to a burst of incoming electrons [15]
. Birch trees [16]  in Tromsų [17] , Norway [18] formed an also eerie
foreground [19] . Recently, new photogenic auroras [20]  have accompanied new
geomagnetic storms [21] .

                        Tomorrow's picture: mostly moon

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    Authors & editors: Robert Nemiroff [33] (MTU [34] ) & Jerry Bonnell [35]
                                  (UMCP [36] )
          NASA Official:  Phillip Newman Specific rights apply [37] .
              NASA Web Privacy Policy and Important Notices [38]
              A service of: ASD [39]  at NASA [40]  / GSFC [41]
                           & Michigan Tech. U. [42]
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Site notes:
  [1] archivepix.html
  [2] image/1811/creatureaurora_salomonsen_600.jpg
  [3] http://www.arcticlightphoto.no/about/
  [4] http://www.arcticlightphoto.no/
  [5] http://asterisk.apod.com/viewtopic.php?f=29&t=32252&start=225#p212559
  [6] http://asterisk.apod.com/discuss_apod.php?date=181118
  [7] ap131031.html
  [8] ap130609.html
  [9] http://spaceweathergallery.com/index.php?title=aurora
  [10] ap020115.html
  [11]
http://arcticlightphoto.photoshelter.com/gallery-image/News/G0000ABqHEeXXLF8/
I0000s_hNlyttARI
  [12] http://www.exploratorium.edu/learning_studio/auroras/difcolors.html
  [13] http://periodic.lanl.gov/8.shtml
  [14] http://periodic.lanl.gov/7.shtml
  [15] http://www-istp.gsfc.nasa.gov/Education/welect.html
  [16] http://en.wikipedia.org/wiki/Birch
  [17] http://en.wikipedia.org/wiki/Troms%C3%B8
  [18] http://en.wikipedia.org/wiki/Norway
  [19] http://img.gawkerassets.com/img/183lbg3rnl5w2jpg/original.jpg
  [20] http://apod.nasa.gov/cgi-bin/apod/apod_search?tquery=aurora
  [21] https://www.nasa.gov/mission_pages/sunearth/news/storms-on-sun.html
  [22] ap181117.html
  [23] archivepix.html
  [24] lib/apsubmit2015.html
  [25] lib/aptree.html
  [26] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [27] calendar/allyears.html
  [28] /apod.rss
  [29] lib/edlinks.html
  [30] lib/about_apod.html
  [31] http://asterisk.apod.com/discuss_apod.php?date=181118
  [32] ap181119.html
  [33] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [34] http://www.phy.mtu.edu/
  [35] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [36] http://www.astro.umd.edu/
  [37] lib/about_apod.html#srapply
  [38] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [39] https://astrophysics.gsfc.nasa.gov/
  [40] https://www.nasa.gov/
  [41] https://www.nasa.gov/centers/goddard/
  [42] http://www.mtu.edu/

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