Astronomy Picture of the Day

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

                               2019 October 27
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                          Ghost Aurora over Canada
            Image Credit & Copyright: [3]Yuichi Takasaka, [4]TWAN

   Explanation: What does this aurora look like to you? While braving the
   cold to watch the skies above northern [5]Canada early one morning in
   2013, a most unusual aurora appeared. The [6]aurora definitely appeared
   to be [7]shaped like something , but what? Two ghostly [8]possibilities
   recorded by the astrophotographer were "witch" and "goddess of dawn",
   but please [9]feel free to suggest your own [10]Halloween-enhanced
   impressions. Regardless of fantastical [11]pareidolic interpretations,
   the pictured aurora had a [12]typical green color and was surely caused
   by the scientifically commonplace action of high energy particles from
   space interacting with [13]oxygen in [14]Earth's upper atmosphere. In
   the image foreground, at the bottom, is a frozen [15]Alexandra Falls,
   while [16]evergreen trees cross the middle.

                       Tomorrow's picture: sun station
     __________________________________________________________________

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    Authors & editors: [28]Robert Nemiroff ([29]MTU) & [30]Jerry Bonnell
                                 ([31]UMCP)
          NASA Official: Phillip Newman [32]Specific rights apply.
              [33]NASA Web Privacy Policy and Important Notices
                A service of: [34]ASD at [35]NASA / [36]GSFC
                           & [37]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1910/AuroraGhost_Takasaka_800.jpg
   3. http://www.blue-moon.ca/contact.html
   4. http://twanight.org/newTWAN/photos.asp?ID=3004071
   5. https://en.wikipedia.org/wiki/Canada
   6. https://www.nasa.gov/mission_pages/sunearth/about-aurorae/index.html
   7. https://apod.nasa.gov/apod/ap161023.html
   8. http://blue-moon.ca/2013feb.html
   9. http://asterisk.apod.com/discuss_apod.php?date=191027
  10. https://s-media-cache-ak0.pinimg.com/originals/b4/aa/bc/b4aabcab1b37ac44839687b434e1d938.jpg
  11. https://en.wikipedia.org/wiki/Pareidolia
  12. http://www.webexhibits.org/causesofcolor/4D.html
  13. http://periodic.lanl.gov/8.shtml
  14. http://www.nasa.gov/mission_pages/sunearth/science/mos-upper-atmosphere.html
  15. https://www.youtube.com/watch?v=DioO92W6iaQ
  16. https://en.wikipedia.org/wiki/Evergreen
  17. https://apod.nasa.gov/apod/ap191026.html
  18. https://apod.nasa.gov/apod/archivepix.html
  19. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  20. https://apod.nasa.gov/apod/lib/aptree.html
  21. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  22. https://apod.nasa.gov/apod/calendar/allyears.html
  23. https://apod.nasa.gov/apod.rss
  24. https://apod.nasa.gov/apod/lib/edlinks.html
  25. https://apod.nasa.gov/apod/lib/about_apod.html
  26. http://asterisk.apod.com/discuss_apod.php?date=191027
  27. https://apod.nasa.gov/apod/ap191028.html
  28. http://www.phy.mtu.edu/faculty/Nemiroff.html
  29. http://www.phy.mtu.edu/
  30. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  31. http://www.astro.umd.edu/
  32. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  33. https://www.nasa.gov/about/highlights/HP_Privacy.html
  34. https://astrophysics.gsfc.nasa.gov/
  35. https://www.nasa.gov/
  36. https://www.nasa.gov/centers/goddard/
  37. http://www.mtu.edu/