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.

                                2022 July 12
    [2]The featured image shows the Eiffel tower in Paris, France below a
   wide display of glowing noctilucent clouds. Please see the explanation
                       for more detailed information.

                        Noctilucent Clouds over Paris
                    Credit & Copyright: [3]Bertrand Kulik

   Explanation: It's northern noctilucent cloud season. Composed of small
   ice crystals forming only during specific conditions in the upper
   atmosphere, [4]noctilucent clouds may become visible at sunset during
   late summer when illuminated by sunlight from below. [5]Noctilucent
   clouds are the [6]highest clouds known and now established to be
   [7]polar mesospheric clouds observed from the ground. Although observed
   with NASA's [8]AIM satellite since 2007, much about [9]noctilucent
   clouds remains unknown and so a [10]topic of active research. The
   [11]featured image shows expansive and rippled [12]noctilucent clouds
   wafting over [13]Paris, [14]France. This year, [15]several northern
   locations are already [16]reporting especially [17]vivid displays of
   noctilucent clouds.

                       Tomorrow's picture: webb begins
     __________________________________________________________________

      [18]< | [19]Archive | [20]Submissions | [21]Index | [22]Search |
   [23]Calendar | [24]RSS | [25]Education | [26]About APOD | [27]Discuss |
                                    [28]>
     __________________________________________________________________

    Authors & editors: [29]Robert Nemiroff ([30]MTU) & [31]Jerry Bonnell
                                 ([32]UMCP)
          NASA Official: Phillip Newman [33]Specific rights apply.
              [34]NASA Web Privacy Policy and Important Notices
                A service of: [35]ASD at [36]NASA / [37]GSFC
                           & [38]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2207/NoctilucentParis_Kulik_1080.jpg
   3. https://www.flickr.com/photos/bertrandkulik/
   4. https://apod.nasa.gov/apod/ap190626.html
   5. https://en.wikipedia.org/wiki/Noctilucent_cloud
   6. https://weather.com/science/weather-explainers/news/2018-06-28-noctilucent-clouds-earth-highest-clouds-view-northern
   7. https://en.wikipedia.org/wiki/Polar_mesospheric_clouds
   8. https://www.nasa.gov/mission_pages/aim/index.html
   9. http://science.nasa.gov/science-news/science-at-nasa/2003/19feb_nlc/
  10. https://ui.adsabs.harvard.edu/abs/2021EGUGA..23.7863B/abstract
  11. https://www.flickr.com/photos/bertrandkulik/52197493369/
  12. https://www.livescience.com/44815-night-shining-clouds-become-more-common.html
  13. https://www.youtube.com/watch?v=YPMOce2VdKQ
  14. https://en.wikipedia.org/wiki/France
  15. http://spaceweathergallery.com/nlc_gallery.html
  16. https://media.istockphoto.com/photos/cat-wearing-sunglasses-outdoors-picture-id1255198816?k=20&m=1255198816&s=612x612&w=0&h=niiqSWzKfNileUZRroAhAWShVzYPJhiv6xdgclIxk_g=
  17. https://apod.nasa.gov/apod/ap190726.html
  18. https://apod.nasa.gov/apod/ap220711.html
  19. https://apod.nasa.gov/apod/archivepix.html
  20. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  21. https://apod.nasa.gov/apod/lib/aptree.html
  22. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  23. https://apod.nasa.gov/apod/calendar/allyears.html
  24. https://apod.nasa.gov/apod.rss
  25. https://apod.nasa.gov/apod/lib/edlinks.html
  26. https://apod.nasa.gov/apod/lib/about_apod.html
  27. http://asterisk.apod.com/discuss_apod.php?date=220712
  28. https://apod.nasa.gov/apod/ap220713.html
  29. http://www.phy.mtu.edu/faculty/Nemiroff.html
  30. http://www.phy.mtu.edu/
  31. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  32. http://www.astro.umd.edu/
  33. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  34. https://www.nasa.gov/about/highlights/HP_Privacy.html
  35. https://astrophysics.gsfc.nasa.gov/
  36. https://www.nasa.gov/
  37. https://www.nasa.gov/centers/goddard/
  38. http://www.mtu.edu/