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 September 2
      [2]The featured image shows the surface of the Sun with a flowing
     texture in red light. Above the Sun's surface an unusual triangular
       prominence hovers. Please see the explanation for more detailed
                                information.

                 A Triangular Prominence Hovers Over the Sun
                 Image Credit & Copyright: [3]Andrea Vanoni

   Explanation: Why is there a triangle hovering over the Sun? Although
   the shape is unusual, the type of structure is not: it is part of an
   evolving [4]solar prominence. Looping magnetic fields on the [5]Sun
   channel the flow of energetic particles, sometimes holding glowing
   gaseous structures aloft for months. A [6]prominence glows brightly
   because it contains particularly hot, dense, or opaque solar [7]plasma.
   The [8]surprising triangular structure occurred last week. Larger than
   our Earth, the [9]iconic prominence was imaged by several solar
   photographers and [10]documented by NASA's [11]Solar Dynamic
   Observatory to form and violently dissipate in about a day. The
   [12]featured image was captured in a color of [13]red light emitted
   strongly by [14]hydrogen. Below, [15]solar fibrils carpet the [16]Sun's
   chromosphere, while the background sky is so faint in comparison that
   no stars are visible. Our Sun's surface has been [17]quite active this
   year.

                      Tomorrow's picture: Moon sisters
     __________________________________________________________________

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    Authors & editors: [29]Robert Nemiroff ([30]MTU) & [31]Jerry Bonnell
                                 ([32]UMCP)
          NASA Official: Amber Straughn [33]Specific rights apply.
            [34]NASA Web Privacy, [35]Accessibility, [36]Notices;
                A service of: [37]ASD at [38]NASA / [39]GSFC,
                         [40]NASA Science Activation
                           & [41]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2409/SunTriangle_Vanoni_960.jpg
   3. https://www.instagram.com/astro.vano/
   4. https://en.wikipedia.org/wiki/Solar_prominence
   5. https://science.nasa.gov/sun/
   6. https://apod.nasa.gov/apod/ap180527.html
   7. https://en.wikipedia.org/wiki/Plasma_(physics)
   8. https://petsonme.com.au/blog//wp-content/uploads/2015/11/pugheadtilt.jpg
   9. https://apod.nasa.gov/apod/ap230801.html
  10. https://www.facebook.com/APOD.Sky/videos/1537986243787259
  11. https://sdo.gsfc.nasa.gov/
  12. https://www.instagram.com/p/C_K1nhxMRrP/
  13. https://en.wikipedia.org/wiki/Hydrogen-alpha
  14. https://periodic.lanl.gov/1.shtml
  15. https://apod.nasa.gov/apod/ap150217.html
  16. https://solarscience.msfc.nasa.gov/chromos.shtml
  17. https://apod.nasa.gov/apod/ap240615.html
  18. https://apod.nasa.gov/apod/ap240901.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.com/feed.rss
  25. https://apod.nasa.gov/apod/lib/edlinks.html
  26. https://apod.nasa.gov/apod/lib/about_apod.html
  27. https://asterisk.apod.com/discuss_apod.php?date=240902
  28. https://apod.nasa.gov/apod/ap240903.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://www.nasa.gov/general/accessibility/
  36. https://www.nasa.gov/privacy/
  37. https://astrophysics.gsfc.nasa.gov/
  38. https://www.nasa.gov/
  39. https://www.nasa.gov/centers/goddard/
  40. https://science.nasa.gov/learners
  41. http://www.mtu.edu/