¿

                        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.

                                 2020 May 31
    [2]See Explanation. Moving the cursor over the image will bring up an
     annotated version. Clicking on the image will bring up the highest
                        resolution version available.

                             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 avoid the Moon visible on the
   lower left. The aurora appeared a [11]day after a [12]large hole opened
   in the [13]Sun's corona allowing particularly energetic particles to
   flow out into the [14]Solar System. The [15]green color of the aurora
   is caused by [16]oxygen atoms recombining with ambient [17]electrons
   high in the [18]Earth's atmosphere.

                       Tomorrow's picture: red lagoon
     __________________________________________________________________

      [19]< | [20]Archive | [21]Submissions | [22]Index | [23]Search |
   [24]Calendar | [25]RSS | [26]Education | [27]About APOD | [28]Discuss |
                                    [29]>
     __________________________________________________________________

    Authors & editors: [30]Robert Nemiroff ([31]MTU) & [32]Jerry Bonnell
                                 ([33]UMCP)
          NASA Official: Phillip Newman [34]Specific rights apply.
              [35]NASA Web Privacy Policy and Important Notices
                A service of: [36]ASD at [37]NASA / [38]GSFC
                           & [39]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2005/AuroraSweden_Strand_1500.jpg
   3. http://www.astrofotografen.se/
   4. https://en.wikipedia.org/wiki/%C3%96stersund
   5. https://en.wikipedia.org/wiki/Sweden
   6. https://spaceplace.nasa.gov/aurora/en/
   7. https://en.wikipedia.org/wiki/Storsj%C3%B6n
   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://spaceweather.com/archive.php?view=1&day=12&month=04&year=2016
  12. https://solarscience.msfc.nasa.gov/feature3.shtml
  13. https://apod.nasa.gov/apod/ap170920.html
  14. https://apod.nasa.gov/apod/ap190520.html
  15. http://www.webexhibits.org/causesofcolor/4D.html
  16. https://www.chemicool.com/elements/oxygen.html
  17. https://www-spof.gsfc.nasa.gov/Education/whelect.html
  18. https://www.nasa.gov/mission_pages/sunearth/science/atmosphere-layers2.html
  19. https://apod.nasa.gov/apod/ap200530.html
  20. https://apod.nasa.gov/apod/archivepix.html
  21. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  22. https://apod.nasa.gov/apod/lib/aptree.html
  23. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  24. https://apod.nasa.gov/apod/calendar/allyears.html
  25. https://apod.nasa.gov/apod.rss
  26. https://apod.nasa.gov/apod/lib/edlinks.html
  27. https://apod.nasa.gov/apod/lib/about_apod.html
  28. http://asterisk.apod.com/discuss_apod.php?date=200531
  29. https://apod.nasa.gov/apod/ap200601.html
  30. http://www.phy.mtu.edu/faculty/Nemiroff.html
  31. http://www.phy.mtu.edu/
  32. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  33. http://www.astro.umd.edu/
  34. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  35. https://www.nasa.gov/about/highlights/HP_Privacy.html
  36. https://astrophysics.gsfc.nasa.gov/
  37. https://www.nasa.gov/
  38. https://www.nasa.gov/centers/goddard/
  39. http://www.mtu.edu/