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.

                                 2024 May 22
   [2]A big green arc is seen arching across the night sky. The arc fades
     away above into a green haze, while no green glow is seen below the
       arc. A dark sky filled with stars and constellations fills the
   background. Snow and distant trees line the foreground. Please see the
                 explanation for more detailed information.

                          Green Aurora over Sweden
                 Image Credit & Copyright: [3]Göran Strand

   Explanation: It was bright and green and stretched across the sky. This
   striking aurora display was captured in 2016 just outside of
   [4]Östersund, [5]Sweden. Six photographic fields were merged to create
   the featured panorama spanning almost 180 degrees. Particularly
   striking aspects of this [6]aurora include its sweeping arc-like shape
   and its stark definition. [7]Lake [8]Storsjön is seen in the
   foreground, while several familiar constellations and the star
   [9]Polaris are visible through the aurora, far in the background.
   Coincidently, the [10]aurora appears to [11]avoid the Moon visible on
   the lower left. The aurora appeared a [12]day after a [13]large hole
   opened in the [14]Sun's corona, allowing particularly energetic
   particles to flow out into the [15]Solar System. The [16]green color of
   the aurora is caused by [17]oxygen atoms recombining with ambient
   [18]electrons high in the [19]Earth's atmosphere.

   Your Sky Surprise: [20]What picture did APOD feature on your birthday?
                                 (post 1995)
                   Tomorrow's picture: galaxies unraveled
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    Authors & editors: [32]Robert Nemiroff ([33]MTU) & [34]Jerry Bonnell
                                 ([35]UMCP)
          NASA Official: Amber Straughn [36]Specific rights apply.
            [37]NASA Web Privacy, [38]Accessibility, [39]Notices;
                A service of: [40]ASD at [41]NASA / [42]GSFC,
                         [43]NASA Science Activation
                           & [44]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2405/AuroraSweden_Strand_1500.jpg
   3. http://www.astrofotografen.se/
   4. https://youtu.be/E0z1BqhtyLA
   5. https://en.wikipedia.org/wiki/Sweden
   6. https://spaceplace.nasa.gov/aurora/
   7. https://en.wikipedia.org/wiki/Storsjön
   8. https://www.youtube.com/watch?v=1KqryCRpT_s
   9. https://apod.nasa.gov/apod/ap150602.html
  10. https://www.youtube.com/watch?v=rMfUVfjHnKc
  11. https://img.buzzfeed.com/buzzfeed-static/static/2019-11/18/19/asset/fa34aa54b531/sub-buzz-8699-1574104451-1.jpg
  12. https://spaceweather.com/archive.php?view=1&day=12&month=04&year=2016
  13. https://solarscience.msfc.nasa.gov/feature3.shtml
  14. https://apod.nasa.gov/apod/ap170920.html
  15. https://apod.nasa.gov/apod/ap190520.html
  16. https://www.webexhibits.org/causesofcolor/4D.html
  17. https://periodic.lanl.gov/8.shtml
  18. https://pwg.gsfc.nasa.gov/Education/whelect.html
  19. https://www.nasa.gov/image-article/earths-atmospheric-layers-3/
  20. https://apod.nasa.gov/apod/calendar/allyears.html
  21. https://apod.nasa.gov/apod/ap240521.html
  22. https://apod.nasa.gov/apod/archivepix.html
  23. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  24. https://apod.nasa.gov/apod/lib/aptree.html
  25. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  26. https://apod.nasa.gov/apod/calendar/allyears.html
  27. https://apod.com/feed.rss
  28. https://apod.nasa.gov/apod/lib/edlinks.html
  29. https://apod.nasa.gov/apod/lib/about_apod.html
  30. https://asterisk.apod.com/discuss_apod.php?date=240522
  31. https://apod.nasa.gov/apod/ap240523.html
  32. http://www.phy.mtu.edu/faculty/Nemiroff.html
  33. http://www.phy.mtu.edu/
  34. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  35. http://www.astro.umd.edu/
  36. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  37. https://www.nasa.gov/about/highlights/HP_Privacy.html
  38. https://www.nasa.gov/general/accessibility/
  39. https://www.nasa.gov/privacy/
  40. https://astrophysics.gsfc.nasa.gov/
  41. https://www.nasa.gov/
  42. https://www.nasa.gov/centers/goddard/
  43. https://science.nasa.gov/learners
  44. http://www.mtu.edu/